Add documentation for Paper Anti-Xray configuration in README

Reviewed-on: #17
Reviewed-by: Elias Müller <elias@elias-mueller.com>

README

@@ -1,3 +1,32 @@
 # Chatcoloring
 Der Spieler benötigt das Recht "chatcolor" damit dessen Namen blau im Chat angezeigt wird.
 
+
+# Server Configuration
+
+## Paper Anti-Xray
+
+Enable Paper's built-in Anti-Xray protection in the Nether to prevent players from locating Ancient Debris through lava using transparent lava resource packs.
+
+**File:** `world/dimensions/minecraft/the_nether/paper-world.yml`
+
+Under `anticheat.anti-xray`, configure:
+
+```yaml
+anticheat:
+  anti-xray:
+    enabled: true
+    engine-mode: 1
+    hidden-blocks:
+      - ancient_debris
+      - nether_gold_ore
+      - nether_quartz_ore
+    lava-obscures: true
+    max-block-height: 128
+    update-radius: 2
+    use-permission: false
+```
+
+Restart the server to apply the changes.
+
+**Tested:** Ancient Debris hidden behind lava is no longer visible when using a transparent lava resource pack.

arena/build.gradle

@@ -0,0 +1,17 @@
+dependencies {
+    implementation project(':common')
+    implementation project(':core')
+
+    compileOnly 'io.papermc.paper:paper-api:26.2.build.129-stable'
+    compileOnly 'org.geysermc.floodgate:api:2.2.4-SNAPSHOT'
+    implementation 'org.apache.httpcomponents:httpclient:4.5.14'
+    implementation 'com.sparkjava:spark-core:2.9.4'
+
+    testImplementation platform('org.junit:junit-bom:5.13.4')
+    testImplementation 'org.junit.jupiter:junit-jupiter'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+test {
+    useJUnitPlatform()
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/Arena.java

@@ -0,0 +1,401 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import com.google.gson.Gson;
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.FightMode;
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.Region;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.api.server.HttpServer;
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
+import eu.mhsl.craftattack.spawn.core.util.entity.DisplayVillager;
+import eu.mhsl.craftattack.spawn.core.util.listener.DismissInventoryOpenFromHolder;
+import eu.mhsl.craftattack.spawn.core.util.listener.PlayerInteractAtEntityEventListener;
+import eu.mhsl.craftattack.spawn.core.util.server.PluginMessage;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import org.bukkit.Bukkit;
+import org.bukkit.GameMode;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.Sound;
+import org.bukkit.World;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.entity.Villager;
+import org.bukkit.event.Listener;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.scheduler.BukkitTask;
+import org.bukkit.util.Vector;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.stream.Stream;
+
+/**
+ * The arena server: tribune, start pads, arenas, fights and resets.
+ * The main server sends a copy of the player's inventory to {@code /api/arena/inventory} before connecting the player.
+ */
+public class Arena extends Appliance {
+    public enum PlayerState {
+        TRIBUNE,
+        PAD,
+        FIGHT,
+        BUILD
+    }
+
+    private record InventoryRequest(UUID player, String items) {
+    }
+
+    private final Map<UUID, PlayerState> states = new HashMap<>();
+    private ArenaWorlds worlds;
+    private ArenaSettings settings;
+    private Teams teams;
+    private ArenaResetter resetter;
+    private final List<ArenaSlot> slots = new ArrayList<>();
+    private @Nullable Lobby lobby;
+    private @Nullable DisplayVillager.ConfigBound villager;
+    private @Nullable BukkitTask tickTask;
+
+    public Arena() {
+        super("arena");
+    }
+
+    @Override
+    public void onEnable() {
+        this.worlds = new ArenaWorlds();
+        this.villager = new DisplayVillager.ConfigBound(this.localConfig(), villager -> {
+            villager.customName(Component.text("Zurück zu CraftAttack", NamedTextColor.GOLD));
+            villager.setProfession(Villager.Profession.CARTOGRAPHER);
+            villager.setVillagerType(Villager.Type.PLAINS);
+        });
+        this.villager.getVillager().addScoreboardTag(Displays.MANAGED_TAG);
+        this.start();
+    }
+
+    @Override
+    public void onDisable() {
+        this.stop();
+    }
+
+    /**
+     * Reads the settings and builds pads, arenas and displays. Separate from onEnable so setup changes
+     * can be applied without restarting the appliance.
+     */
+    private void start() {
+        this.settings = ArenaSettings.read(this.localConfig(), this.worlds.play());
+        this.teams = new Teams();
+        this.resetter = new ArenaResetter(this.worlds, this.settings.resetBlocksPerTick());
+
+        this.settings.arenas().stream()
+            .filter(ArenaSettings.Slot::isComplete)
+            .forEach(slot -> this.slots.add(new ArenaSlot(slot, this.worlds.play())));
+        this.settings.arenas().stream()
+            .filter(slot -> !slot.isComplete())
+            .forEach(slot -> Main.logger().warning("Arena '" + slot.name() + "' is incomplete (region, spawn1, spawn2) and stays disabled"));
+
+        if(this.settings.padsComplete()) this.lobby = new Lobby(this, this.settings.pads());
+        else Main.logger().warning("Arena: pads are not set up, fights cannot be started");
+
+        this.syncRegions().forEach(region -> this.worlds.keepLoaded(region, Main.instance()));
+        this.removeStrayVillagers();
+        this.placeStarterPlatform();
+        this.syncAll();
+
+        Bukkit.getOnlinePlayers().stream()
+            .filter(player -> this.state(player) != PlayerState.BUILD)
+            .forEach(this::toTribune);
+        this.tickTask = Bukkit.getScheduler().runTaskTimer(Main.instance(), this::tick, 1, 1);
+    }
+
+    private void stop() {
+        if(this.tickTask != null) this.tickTask.cancel();
+        this.slots.forEach(slot -> {
+            if(slot.fight != null) slot.fight.abort();
+            slot.remove();
+        });
+        this.slots.clear();
+        if(this.lobby != null) this.lobby.shutdown();
+        this.lobby = null;
+        this.resetter.cancel();
+        this.teams.clear();
+        this.worlds.releaseChunks(Main.instance());
+    }
+
+    public void reload() {
+        if(this.slots.stream().anyMatch(slot -> slot.state == ArenaSlot.State.FIGHT))
+            throw new ApplianceCommand.Error("Es läuft gerade ein Kampf");
+        if(this.lobby != null && !this.lobby.isIdle())
+            throw new ApplianceCommand.Error("Gerade steht jemand auf einem Startfeld");
+        this.stop();
+        this.start();
+    }
+
+    /**
+     * Copies the whole tribune area and all arenas from the template.
+     */
+    public void syncAll() {
+        this.slots.forEach(slot -> slot.state = ArenaSlot.State.RESET);
+        List<Region> regions = this.syncRegions();
+        for(int i = 0; i < regions.size(); i++) {
+            boolean last = i == regions.size() - 1;
+            this.resetter.reset(regions.get(i), () -> {
+                if(!last) return;
+                this.slots.forEach(slot -> slot.state = ArenaSlot.State.FREE);
+                Main.logger().info("Arena: all regions synced from the template");
+            });
+        }
+        if(regions.isEmpty()) this.slots.forEach(slot -> slot.state = ArenaSlot.State.FREE);
+    }
+
+    public boolean isBusy() {
+        return this.slots.stream().anyMatch(slot -> slot.state != ArenaSlot.State.FREE)
+            || (this.lobby != null && !this.lobby.isIdle());
+    }
+
+    private List<Region> syncRegions() {
+        return Stream.concat(
+            Stream.ofNullable(this.settings.syncRegion()),
+            this.slots.stream().map(slot -> slot.settings.region())
+        ).toList();
+    }
+
+    private void tick() {
+        this.resetter.tick();
+        if(this.lobby != null) this.lobby.tick();
+        if(Bukkit.getCurrentTick() % 10 != 0) return;
+        this.slots.forEach(ArenaSlot::updateDisplay);
+
+        // nobody takes damage outside of fights, so falling into the void would never end
+        World play = this.worlds.play();
+        play.getPlayers().stream()
+            .filter(player -> player.getY() < play.getMinHeight() - 16 && this.state(player) != PlayerState.FIGHT)
+            .forEach(this::toTribune);
+    }
+
+    /**
+     * Removes old copies of the return villager, for example after its position was changed in the config by hand.
+     */
+    private void removeStrayVillagers() {
+        Region region = this.settings.syncRegion();
+        if(region == null || this.villager == null) return;
+        UUID current = this.villager.getUniqueId();
+        for(int cx = region.minChunkX(); cx <= region.maxChunkX(); cx++) {
+            for(int cz = region.minChunkZ(); cz <= region.maxChunkZ(); cz++) {
+                for(Entity entity : this.worlds.play().getChunkAt(cx, cz).getEntities()) {
+                    if(!(entity instanceof Villager) || entity.getUniqueId().equals(current)) continue;
+                    if(!entity.getScoreboardTags().contains(Displays.MANAGED_TAG)) continue;
+                    entity.remove();
+                    Main.logger().info("Arena: removed a stray return villager at " + entity.getLocation().toVector());
+                }
+            }
+        }
+    }
+
+    /**
+     * A fresh, empty world gets a small platform at the tribune spawn, so the first visitors do not fall into the void.
+     */
+    private void placeStarterPlatform() {
+        Location spawn = this.settings.tribuneSpawn();
+        if(spawn == null) return;
+        for(World world : new World[]{this.worlds.play(), this.worlds.template()}) {
+            Location below = spawn.clone();
+            below.setWorld(world);
+            below.subtract(0, 1, 0);
+            if(!below.getBlock().getType().isAir()) return;
+        }
+        for(World world : new World[]{this.worlds.play(), this.worlds.template()}) {
+            for(int dx = -3; dx <= 3; dx++) {
+                for(int dz = -3; dz <= 3; dz++) {
+                    world.getBlockAt(spawn.getBlockX() + dx, spawn.getBlockY() - 1, spawn.getBlockZ() + dz).setType(Material.SMOOTH_STONE, false);
+                }
+            }
+        }
+        Main.logger().info("Arena: placed a starter platform at the tribune spawn");
+    }
+
+    boolean hasFreeSlot() {
+        return this.slots.stream().anyMatch(slot -> slot.state == ArenaSlot.State.FREE);
+    }
+
+    void startFight(List<List<Player>> teams, FightMode mode, Map<UUID, UUID> kits) {
+        ArenaSlot slot = this.slots.stream().filter(s -> s.state == ArenaSlot.State.FREE).findFirst().orElse(null);
+        if(slot == null) {
+            teams.forEach(team -> team.forEach(this::toTribune));
+            return;
+        }
+        new Fight(this, slot, teams, mode, kits).start();
+    }
+
+    void resetSlot(ArenaSlot slot) {
+        if(!this.slots.contains(slot)) return;
+        slot.state = ArenaSlot.State.RESET;
+        this.resetter.reset(slot.settings.region(), () -> {
+            if(!this.slots.contains(slot)) return;
+            slot.state = ArenaSlot.State.FREE;
+            Location display = slot.settings.displayLocation(this.worlds.play());
+            Style.play(display, Sound.BLOCK_BEACON_ACTIVATE, 1.5f, 1.2f);
+        });
+    }
+
+    /**
+     * Brings the player back to the tribune with the own inventory, locked.
+     */
+    public void toTribune(Player player) {
+        if(this.lobby != null) this.lobby.leave(player);
+        this.setState(player, PlayerState.TRIBUNE);
+        this.teams.leave(player);
+        player.closeInventory();
+        Location spawn = this.settings.tribuneSpawn();
+        player.teleport(spawn != null ? spawn : this.worlds.play().getSpawnLocation());
+        restore(player, GameMode.ADVENTURE);
+        InventoryStore.apply(player, player.getUniqueId());
+    }
+
+    /**
+     * Full health and food, no effects, no fire.
+     */
+    static void restore(Player player, GameMode gameMode) {
+        player.setGameMode(gameMode);
+        player.getActivePotionEffects().stream().map(PotionEffect::getType).forEach(player::removePotionEffect);
+        player.setHealth(Objects.requireNonNull(player.getAttribute(Attribute.MAX_HEALTH)).getValue());
+        player.setAbsorptionAmount(0);
+        player.setFoodLevel(20);
+        player.setSaturation(5);
+        player.setExhaustion(0);
+        player.setFireTicks(0);
+        player.setFreezeTicks(0);
+        player.setFallDistance(0);
+        player.setArrowsInBody(0, false);
+        player.setVelocity(new Vector());
+    }
+
+    public void toggleBuild(Player player) {
+        PlayerState state = this.state(player);
+        if(state == PlayerState.BUILD) {
+            Location target = player.getLocation().clone();
+            target.setWorld(this.worlds.play());
+            this.toTribune(player);
+            if(!this.isInsideArena(target)) player.teleport(target);
+            player.sendMessage(Style.message("Bau-Modus beendet. Änderungen an der Vorlage übernimmst du mit /arenasetup sync."));
+            return;
+        }
+        if(state != PlayerState.TRIBUNE) throw new ApplianceCommand.Error("Nur von der Tribüne aus möglich");
+
+        this.setState(player, PlayerState.BUILD);
+        this.teams.leave(player);
+        Location target = player.getLocation().clone();
+        target.setWorld(this.worlds.template());
+        player.getInventory().clear();
+        player.teleport(target);
+        player.setGameMode(GameMode.CREATIVE);
+        player.sendMessage(Style.message("Du bist in der Vorlage. Mit /build kommst du zurück."));
+    }
+
+    void moveVillager(Location location) {
+        Objects.requireNonNull(this.villager).updateLocation(location);
+    }
+
+    List<String> arenaNames() {
+        return this.settings.arenas().stream().map(ArenaSettings.Slot::name).toList();
+    }
+
+    public void sendToCraftAttack(Player player) {
+        PluginMessage.connect(player, this.settings.returnServer());
+    }
+
+    public void handleQuit(Player player) {
+        Fight fight = this.fightOf(player);
+        if(fight != null && fight.isAlive(player.getUniqueId())) fight.forfeit(player.getUniqueId());
+        if(this.lobby != null) this.lobby.leave(player);
+        this.teams.leave(player);
+        this.states.remove(player.getUniqueId());
+    }
+
+    public PlayerState state(Player player) {
+        return this.states.getOrDefault(player.getUniqueId(), PlayerState.TRIBUNE);
+    }
+
+    void setState(Player player, PlayerState state) {
+        this.states.put(player.getUniqueId(), state);
+    }
+
+    /**
+     * The fight the player is part of, also during the short celebration after it ended.
+     */
+    public @Nullable Fight fightOf(Player player) {
+        return this.slots.stream()
+            .map(slot -> slot.fight)
+            .filter(fight -> fight != null && fight.involves(player.getUniqueId()))
+            .findFirst()
+            .orElse(null);
+    }
+
+    /**
+     * Whether blocks may change at this position of the play world: only inside arenas.
+     */
+    public boolean isInsideArena(Location location) {
+        return this.slots.stream().anyMatch(slot -> slot.settings.region().contains(location.getX(), location.getY(), location.getZ()));
+    }
+
+    public @Nullable Region arenaRegionOf(Player player) {
+        Fight fight = this.fightOf(player);
+        return fight == null ? null : fight.region();
+    }
+
+    public @Nullable Lobby lobby() {
+        return this.lobby;
+    }
+
+    public ArenaWorlds worlds() {
+        return this.worlds;
+    }
+
+    ArenaSettings settings() {
+        return this.settings;
+    }
+
+    Teams teams() {
+        return this.teams;
+    }
+
+    @Override
+    public void httpApi(HttpServer.ApiBuilder apiBuilder) {
+        Gson gson = new Gson();
+        apiBuilder.rawPost("inventory", (request, response) -> {
+            InventoryRequest body = gson.fromJson(request.body(), InventoryRequest.class);
+            if(body == null || body.player() == null || body.items() == null) throw new IllegalArgumentException("player and items are required");
+            InventoryStore.put(body.player(), Base64.getDecoder().decode(body.items()));
+            return HttpServer.nothing;
+        });
+    }
+
+    @Override
+    @NotNull
+    protected List<ApplianceCommand<?>> commands() {
+        return List.of(new BuildCommand(), new ArenaSetupCommand(), new CraftAttackCommand());
+    }
+
+    @Override
+    @NotNull
+    protected List<Listener> listeners() {
+        UUID villager = Objects.requireNonNull(this.villager).getUniqueId();
+        return List.of(
+            new PlayerConnectionListener(),
+            new LockListener(),
+            new FightListener(),
+            new WorldProtectionListener(),
+            new ModeMenuListener(),
+            new NoProgressListener(),
+            new PlayerInteractAtEntityEventListener(villager, event -> this.sendToCraftAttack(event.getPlayer())),
+            new DismissInventoryOpenFromHolder(villager)
+        );
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/ArenaResetter.java

@@ -0,0 +1,127 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.Region;
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.ResetCursor;
+import eu.mhsl.craftattack.spawn.core.Main;
+import org.bukkit.Chunk;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockState;
+import org.bukkit.block.Container;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.util.BoundingBox;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Queue;
+
+/**
+ * Copies regions from the template world over the play world. Only blocks that differ are written,
+ * without physics. Block entities (chests, signs, banners) are always copied, so changed contents are reset too.
+ * The work is spread over ticks with a fixed block budget.
+ */
+final class ArenaResetter {
+    private record Job(Region region, ResetCursor cursor, Runnable onDone) {
+    }
+
+    private final World play;
+    private final World template;
+    private final int blocksPerTick;
+    private final Queue<Job> jobs = new ArrayDeque<>();
+    private Job current;
+
+    ArenaResetter(ArenaWorlds worlds, int blocksPerTick) {
+        this.play = worlds.play();
+        this.template = worlds.template();
+        this.blocksPerTick = blocksPerTick;
+    }
+
+    void reset(Region region, Runnable onDone) {
+        this.jobs.add(new Job(region, new ResetCursor(region), onDone));
+    }
+
+    boolean isBusy() {
+        return this.current != null || !this.jobs.isEmpty();
+    }
+
+    void cancel() {
+        this.jobs.clear();
+        this.current = null;
+    }
+
+    /**
+     * Called every server tick.
+     */
+    void tick() {
+        int budget = this.blocksPerTick;
+        while(budget > 0) {
+            if(this.current == null) {
+                this.current = this.jobs.poll();
+                if(this.current == null) return;
+                this.prepare(this.current.region);
+            }
+
+            budget -= this.current.cursor.advance(budget, this::copyBlock);
+            if(!this.current.cursor.isDone()) return;
+
+            this.finish(this.current.region);
+            Job done = this.current;
+            this.current = null;
+            try {
+                done.onDone.run();
+            } catch(Exception e) {
+                Main.logger().warning("Arena: error after reset: " + e.getMessage());
+            }
+        }
+    }
+
+    private void prepare(Region region) {
+        this.removeEntities(region);
+        // empty containers first, otherwise replacing them would drop their contents
+        for(BlockState state : this.blockEntities(this.play, region, false)) {
+            if(state instanceof Container container) container.getInventory().clear();
+        }
+    }
+
+    private void copyBlock(int x, int y, int z) {
+        BlockData source = this.template.getBlockAt(x, y, z).getBlockData();
+        Block target = this.play.getBlockAt(x, y, z);
+        if(!target.getBlockData().equals(source)) target.setBlockData(source, false);
+    }
+
+    private void finish(Region region) {
+        for(BlockState state : this.blockEntities(this.template, region, true)) {
+            state.copy(new Location(this.play, state.getX(), state.getY(), state.getZ())).update(true, false);
+        }
+        this.removeEntities(region);
+    }
+
+    private List<BlockState> blockEntities(World world, Region region, boolean snapshot) {
+        List<BlockState> states = new ArrayList<>();
+        for(int cx = region.minChunkX(); cx <= region.maxChunkX(); cx++) {
+            for(int cz = region.minChunkZ(); cz <= region.maxChunkZ(); cz++) {
+                Chunk chunk = world.getChunkAt(cx, cz);
+                for(BlockState state : chunk.getTileEntities(snapshot)) {
+                    if(region.contains(state.getX(), state.getY(), state.getZ())) states.add(state);
+                }
+            }
+        }
+        return states;
+    }
+
+    private void removeEntities(Region region) {
+        BoundingBox box = new BoundingBox(
+            region.minX(), region.minY(), region.minZ(),
+            region.maxX() + 1, region.maxY() + 1, region.maxZ() + 1
+        );
+        for(Entity entity : this.play.getNearbyEntities(box)) {
+            if(entity instanceof Player) continue;
+            if(entity.getScoreboardTags().contains(Displays.MANAGED_TAG)) continue;
+            entity.remove();
+        }
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/ArenaSettings.java

@@ -0,0 +1,94 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.Region;
+import eu.mhsl.craftattack.spawn.core.config.ConfigUtil;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.configuration.ConfigurationSection;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Positions and limits from the {@code arena} config section. All positions refer to the play world,
+ * no matter which world was stored.
+ */
+record ArenaSettings(
+    @Nullable Location tribuneSpawn,
+    @Nullable Region syncRegion,
+    @Nullable Region[] pads,
+    List<Slot> arenas,
+    int fightSeconds,
+    int countdownSeconds,
+    int resetBlocksPerTick,
+    String returnServer
+) {
+    static final String[] PAD_KEYS = {"red", "blue"};
+
+    record Slot(String name, @Nullable Region region, @Nullable Location[] spawns, @Nullable Location display) {
+        boolean isComplete() {
+            return this.region != null && this.spawns[0] != null && this.spawns[1] != null;
+        }
+
+        Location displayLocation(World world) {
+            if(this.display != null) return this.display;
+            return new Location(world, this.region.centerX(), this.region.maxY() + 1.5, this.region.centerZ());
+        }
+    }
+
+    static ArenaSettings read(ConfigurationSection config, World world) {
+        Region[] pads = new Region[PAD_KEYS.length];
+        for(int i = 0; i < PAD_KEYS.length; i++) {
+            pads[i] = readRegion(config.getConfigurationSection("pads." + PAD_KEYS[i]));
+        }
+
+        List<Slot> arenas = new ArrayList<>();
+        ConfigurationSection arenaSection = config.getConfigurationSection("arenas");
+        if(arenaSection != null) {
+            for(String name : arenaSection.getKeys(false)) {
+                ConfigurationSection slot = arenaSection.getConfigurationSection(name);
+                if(slot == null) continue;
+                arenas.add(new Slot(
+                    name,
+                    readRegion(slot.getConfigurationSection("region")),
+                    new Location[]{
+                        readLocation(slot.getConfigurationSection("spawn1"), world),
+                        readLocation(slot.getConfigurationSection("spawn2"), world)
+                    },
+                    readLocation(slot.getConfigurationSection("display"), world)
+                ));
+            }
+        }
+
+        return new ArenaSettings(
+            readLocation(config.getConfigurationSection("tribuneSpawn"), world),
+            readRegion(config.getConfigurationSection("syncRegion")),
+            pads,
+            arenas,
+            Math.max(1, config.getInt("fightMinutes", 10)) * 60,
+            Math.max(1, config.getInt("countdownSeconds", 5)),
+            Math.max(1000, config.getInt("resetBlocksPerTick", 20000)),
+            config.getString("connect-server-name", "craftattack")
+        );
+    }
+
+    boolean padsComplete() {
+        return this.pads[0] != null && this.pads[1] != null;
+    }
+
+    private static @Nullable Region readRegion(@Nullable ConfigurationSection section) {
+        if(section == null) return null;
+        List<Integer> a = section.getIntegerList("pos1");
+        List<Integer> b = section.getIntegerList("pos2");
+        if(a.size() != 3 || b.size() != 3) return null;
+        return Region.of(a.get(0), a.get(1), a.get(2), b.get(0), b.get(1), b.get(2));
+    }
+
+    private static @Nullable Location readLocation(@Nullable ConfigurationSection section, World world) {
+        if(section == null) return null;
+        Location location = ConfigUtil.Position.paseLocation(section);
+        location.setWorld(world);
+        return location;
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/ArenaSetupCommand.java

@@ -0,0 +1,116 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
+import eu.mhsl.craftattack.spawn.core.config.ConfigUtil;
+import eu.mhsl.craftattack.spawn.core.config.Configuration;
+import org.bukkit.Location;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.configuration.ConfigurationSection;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Setting up tribune, pads and arenas at the own position. Works in the play world and in the template.
+ * Changes take effect with {@code /arenasetup reload}.
+ */
+class ArenaSetupCommand extends ApplianceCommand.PlayerChecked<Arena> {
+    private static final String USAGE = String.join("\n",
+        "/arenasetup tribune",
+        "/arenasetup villager",
+        "/arenasetup pad <red|blue> <pos1|pos2>",
+        "/arenasetup arena <name> <pos1|pos2|spawn1|spawn2|display|remove>",
+        "/arenasetup syncregion <pos1|pos2>",
+        "/arenasetup sync",
+        "/arenasetup reload"
+    );
+
+    ArenaSetupCommand() {
+        super("arenasetup");
+    }
+
+    @Override
+    public @Nullable String permission() {
+        return "admin";
+    }
+
+    @Override
+    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        if(args.length == 0) throw new Error("\n" + USAGE);
+        Location location = this.getPlayer().getLocation().clone();
+        location.setWorld(this.getAppliance().worlds().play());
+        ConfigurationSection config = this.getAppliance().localConfig();
+
+        switch(args[0]) {
+            case "tribune" -> this.writeLocation(config, "tribuneSpawn", location);
+            case "villager" -> this.getAppliance().moveVillager(location);
+            case "pad" -> {
+                if(args.length < 3 || !List.of(ArenaSettings.PAD_KEYS).contains(args[1])) throw new Error(USAGE);
+                this.writeCorner(config, "pads." + args[1], args[2], location);
+            }
+            case "arena" -> {
+                if(args.length < 3) throw new Error(USAGE);
+                String path = "arenas." + args[1];
+                switch(args[2]) {
+                    case "pos1", "pos2" -> this.writeCorner(config, path + ".region", args[2], location);
+                    case "spawn1", "spawn2", "display" -> this.writeLocation(config, path + "." + args[2], location);
+                    case "remove" -> config.set(path, null);
+                    default -> throw new Error(USAGE);
+                }
+            }
+            case "syncregion" -> {
+                if(args.length < 2) throw new Error(USAGE);
+                this.writeCorner(config, "syncRegion", args[1], location);
+            }
+            case "sync" -> {
+                if(this.getAppliance().isBusy()) throw new Error("Es läuft gerade ein Kampf, Countdown oder Reset");
+                this.getAppliance().syncAll();
+                sender.sendMessage(Style.message("Die Spielwelt wird aus der Vorlage übernommen."));
+                return;
+            }
+            case "reload" -> {
+                this.getAppliance().reload();
+                sender.sendMessage(Style.message("Einstellungen übernommen. Die Arenen werden aus der Vorlage aufgebaut."));
+                return;
+            }
+            default -> throw new Error("\n" + USAGE);
+        }
+
+        Configuration.saveChanges();
+        sender.sendMessage(Style.message("Gespeichert. Mit /arenasetup reload übernehmen."));
+    }
+
+    private void writeCorner(ConfigurationSection config, String path, String corner, Location location) {
+        if(!corner.equals("pos1") && !corner.equals("pos2")) throw new Error(USAGE);
+        config.set(path + "." + corner, List.of(location.getBlockX(), location.getBlockY(), location.getBlockZ()));
+    }
+
+    private void writeLocation(ConfigurationSection config, String path, Location location) {
+        ConfigurationSection section = Optional.ofNullable(config.getConfigurationSection(path)).orElseGet(() -> config.createSection(path));
+        ConfigUtil.Position.writeLocation(section, location);
+    }
+
+    @Override
+    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        List<String> options = switch(args.length) {
+            case 1 -> List.of("tribune", "villager", "pad", "arena", "syncregion", "sync", "reload");
+            case 2 -> switch(args[0]) {
+                case "pad" -> Arrays.asList(ArenaSettings.PAD_KEYS);
+                case "syncregion" -> List.of("pos1", "pos2");
+                case "arena" -> this.getAppliance().arenaNames();
+                default -> List.of();
+            };
+            case 3 -> switch(args[0]) {
+                case "pad" -> List.of("pos1", "pos2");
+                case "arena" -> List.of("pos1", "pos2", "spawn1", "spawn2", "display", "remove");
+                default -> List.of();
+            };
+            default -> List.of();
+        };
+        return this.tabCompleteReducer(options, args);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/ArenaSlot.java

@@ -0,0 +1,45 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import org.bukkit.World;
+import org.bukkit.entity.TextDisplay;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * One arena: free, in a fight or being reset.
+ */
+final class ArenaSlot {
+    enum State {
+        FREE,
+        FIGHT,
+        RESET
+    }
+
+    final ArenaSettings.Slot settings;
+    State state = State.RESET;
+    @Nullable Fight fight;
+    private final TextDisplay display;
+
+    ArenaSlot(ArenaSettings.Slot settings, World world) {
+        this.settings = settings;
+        // seen from the tribune across half an arena, so twice the size
+        this.display = Displays.spawn(settings.displayLocation(world), 2f);
+    }
+
+    void updateDisplay() {
+        Component title = Component.text("Arena " + this.settings.name(), NamedTextColor.GOLD);
+        Component status = switch(this.state) {
+            case FREE -> Component.text("Frei", NamedTextColor.GREEN);
+            case RESET -> Component.text("Wird zurückgesetzt", NamedTextColor.YELLOW);
+            case FIGHT -> this.fight == null
+                ? Component.text("Kampf", NamedTextColor.RED)
+                : this.fight.headline().appendNewline().append(Component.text(Style.time(this.fight.secondsLeft()), NamedTextColor.WHITE));
+        };
+        this.display.text(title.appendNewline().append(status));
+    }
+
+    void remove() {
+        this.display.remove();
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/ArenaWorlds.java

@@ -0,0 +1,90 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.Region;
+import org.bukkit.Bukkit;
+import org.bukkit.GameRules;
+import org.bukkit.World;
+import org.bukkit.WorldCreator;
+import org.bukkit.generator.ChunkGenerator;
+import org.bukkit.plugin.Plugin;
+
+import java.util.Objects;
+
+/**
+ * The play world and its template. Players only fight in the play world; admins build in the template,
+ * which is copied over the play world on every reset.
+ */
+final class ArenaWorlds {
+    static final String PLAY = "arena";
+    static final String TEMPLATE = "arena_template";
+
+    private static final class VoidGenerator extends ChunkGenerator {
+    }
+
+    private final World play;
+    private final World template;
+
+    ArenaWorlds() {
+        this.play = load(PLAY);
+        this.template = load(TEMPLATE);
+
+        for(World world : new World[]{this.play, this.template}) {
+            world.setGameRule(GameRules.ADVANCE_TIME, false);
+            world.setGameRule(GameRules.ADVANCE_WEATHER, false);
+            world.setGameRule(GameRules.SPAWN_MOBS, false);
+            world.setGameRule(GameRules.SPAWN_MONSTERS, false);
+            world.setGameRule(GameRules.SPAWN_PHANTOMS, false);
+            world.setGameRule(GameRules.SPAWN_PATROLS, false);
+            world.setGameRule(GameRules.SPAWN_WANDERING_TRADERS, false);
+            world.setGameRule(GameRules.SPAWN_WARDENS, false);
+            world.setGameRule(GameRules.RAIDS, false);
+            world.setGameRule(GameRules.SHOW_DEATH_MESSAGES, false);
+            world.setGameRule(GameRules.SHOW_ADVANCEMENT_MESSAGES, false);
+            world.setStorm(false);
+            world.setThundering(false);
+            world.setTime(6000);
+        }
+        this.play.setGameRule(GameRules.IMMEDIATE_RESPAWN, true);
+        this.play.setGameRule(GameRules.KEEP_INVENTORY, true);
+        this.template.setGameRule(GameRules.RANDOM_TICK_SPEED, 0);
+        this.template.setGameRule(GameRules.FIRE_SPREAD_RADIUS_AROUND_PLAYER, 0);
+    }
+
+    private static World load(String name) {
+        World world = Bukkit.getWorld(name);
+        if(world != null) return world;
+        return Objects.requireNonNull(
+            new WorldCreator(name).generator(new VoidGenerator()).generateStructures(false).createWorld(),
+            "Could not create world " + name
+        );
+    }
+
+    World play() {
+        return this.play;
+    }
+
+    World template() {
+        return this.template;
+    }
+
+    boolean isPlay(World world) {
+        return this.play.equals(world);
+    }
+
+    /**
+     * Keeps all chunks of the region loaded in both worlds, so resets never wait for chunk loading.
+     */
+    void keepLoaded(Region region, Plugin plugin) {
+        for(int cx = region.minChunkX(); cx <= region.maxChunkX(); cx++) {
+            for(int cz = region.minChunkZ(); cz <= region.maxChunkZ(); cz++) {
+                this.play.addPluginChunkTicket(cx, cz, plugin);
+                this.template.addPluginChunkTicket(cx, cz, plugin);
+            }
+        }
+    }
+
+    void releaseChunks(Plugin plugin) {
+        this.play.removePluginChunkTickets(plugin);
+        this.template.removePluginChunkTickets(plugin);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/BuildCommand.java

@@ -0,0 +1,26 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Switches between the play world and the template at the same position.
+ */
+class BuildCommand extends ApplianceCommand.PlayerChecked<Arena> {
+    BuildCommand() {
+        super("build");
+    }
+
+    @Override
+    public @Nullable String permission() {
+        return "arena.build";
+    }
+
+    @Override
+    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        this.getAppliance().toggleBuild(this.getPlayer());
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/CraftAttackCommand.java

@@ -0,0 +1,17 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+
+class CraftAttackCommand extends ApplianceCommand.PlayerChecked<Arena> {
+    CraftAttackCommand() {
+        super("craftattack");
+    }
+
+    @Override
+    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        this.getAppliance().sendToCraftAttack(this.getPlayer());
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/Displays.java

@@ -0,0 +1,41 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.core.Main;
+import org.bukkit.Color;
+import org.bukkit.Location;
+import org.bukkit.entity.Display;
+import org.bukkit.entity.TextDisplay;
+import org.bukkit.util.Transformation;
+
+/**
+ * Floating texts above pads and arenas. They are not saved with the world and come back with every start.
+ */
+final class Displays {
+    static final String MANAGED_TAG = "arena_managed";
+
+    private Displays() {
+    }
+
+    static TextDisplay spawn(Location location) {
+        return spawn(location, 1f);
+    }
+
+    static TextDisplay spawn(Location location, float scale) {
+        // displays are not saved, they would vanish with an unloaded chunk
+        location.getWorld().addPluginChunkTicket(location.getBlockX() >> 4, location.getBlockZ() >> 4, Main.instance());
+        return location.getWorld().spawn(location, TextDisplay.class, display -> {
+            display.setPersistent(false);
+            display.setBillboard(Display.Billboard.CENTER);
+            display.setAlignment(TextDisplay.TextAlignment.CENTER);
+            display.setShadowed(true);
+            display.setBackgroundColor(Color.fromARGB(110, 0, 0, 0));
+            display.setLineWidth(220);
+            display.addScoreboardTag(MANAGED_TAG);
+            if(scale != 1f) {
+                Transformation transformation = display.getTransformation();
+                transformation.getScale().set(scale);
+                display.setTransformation(transformation);
+            }
+        });
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/Fight.java

@@ -0,0 +1,405 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.FightMode;
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.Region;
+import eu.mhsl.craftattack.spawn.core.Main;
+import net.kyori.adventure.bossbar.BossBar;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.JoinConfiguration;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.title.Title;
+import org.bukkit.Bukkit;
+import org.bukkit.Color;
+import org.bukkit.GameMode;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Sound;
+import org.bukkit.entity.Player;
+import org.bukkit.scheduler.BukkitTask;
+import org.jetbrains.annotations.Nullable;
+
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * A running fight in one arena between team 0 (red pad, spawn 1) and team 1 (blue pad, spawn 2).
+ * A team loses once none of its players is left in the arena.
+ */
+final class Fight {
+    private static final int CELEBRATION_TICKS = 60;
+    private static final double SPECTATOR_RANGE = 32;
+    private static final double SPAWN_SPREAD = 2;
+
+    private final Arena arena;
+    private final ArenaSlot slot;
+    private final List<List<UUID>> teams;
+    private final Map<UUID, String> names = new HashMap<>();
+    private final List<Set<UUID>> alive;
+    private final FightMode mode;
+    private final Map<UUID, UUID> kits;
+    private final BossBar bossBar;
+    private final Set<UUID> bossBarViewers = new HashSet<>();
+    private int secondsLeft;
+    private boolean over;
+    private @Nullable BukkitTask timer;
+
+    Fight(Arena arena, ArenaSlot slot, List<List<Player>> teams, FightMode mode, Map<UUID, UUID> kits) {
+        this.arena = arena;
+        this.slot = slot;
+        this.teams = teams.stream().map(team -> team.stream().map(Player::getUniqueId).toList()).toList();
+        teams.forEach(team -> team.forEach(player -> this.names.put(player.getUniqueId(), player.getName())));
+        this.alive = this.teams.stream().map(team -> (Set<UUID>) new LinkedHashSet<>(team)).toList();
+        this.mode = mode;
+        this.kits = kits;
+        this.secondsLeft = arena.settings().fightSeconds();
+        this.bossBar = BossBar.bossBar(Component.empty(), 1f, BossBar.Color.RED, BossBar.Overlay.NOTCHED_10);
+    }
+
+    void start() {
+        this.slot.state = ArenaSlot.State.FIGHT;
+        this.slot.fight = this;
+
+        for(int team = 0; team < 2; team++) {
+            List<UUID> members = this.teams.get(team);
+            for(int i = 0; i < members.size(); i++) {
+                Player player = Bukkit.getPlayer(members.get(i));
+                if(player == null) continue;
+                this.arena.setState(player, Arena.PlayerState.FIGHT);
+                this.arena.teams().join(player, Teams.fight(team));
+                player.closeInventory();
+                player.teleport(this.spawnFor(team, i, members.size()));
+                Arena.restore(player, GameMode.SURVIVAL);
+                InventoryStore.apply(player, this.kits.getOrDefault(player.getUniqueId(), player.getUniqueId()));
+
+                player.showTitle(Title.title(
+                    Component.text("Kampf!", NamedTextColor.GOLD),
+                    Component.text("gegen ", NamedTextColor.GRAY).append(this.teamNames(1 - team)),
+                    Title.Times.times(Duration.ZERO, Duration.ofMillis(1500), Duration.ofMillis(500))
+                ));
+                Style.play(player, Sound.EVENT_RAID_HORN, 1.2f);
+            }
+        }
+        // players who left during the countdown never arrived
+        for(int team = 0; team < 2; team++) this.alive.get(team).removeIf(uuid -> Bukkit.getPlayer(uuid) == null);
+
+        Bukkit.broadcast(Style.message(
+            this.teamNames(0).append(Component.text(" gegen ", NamedTextColor.GRAY)).append(this.teamNames(1))
+                .append(Component.text(" in Arena " + this.slot.settings.name() + ". Modus: " + this.mode.displayName(this.isTeamFight()), NamedTextColor.GRAY))
+        ));
+        this.updateBossBar();
+        this.timer = Bukkit.getScheduler().runTaskTimer(Main.instance(), this::tickSecond, 20, 20);
+        if(this.alive.get(0).isEmpty() || this.alive.get(1).isEmpty()) this.checkEnd();
+    }
+
+    /**
+     * Team members stand in a small circle around the spawn, facing the same way.
+     */
+    private Location spawnFor(int team, int index, int count) {
+        Location center = this.slot.settings.spawns()[team];
+        if(count == 1) return center;
+        double angle = 2 * Math.PI * index / count;
+        Location spot = center.clone().add(Math.cos(angle) * SPAWN_SPREAD, 0, Math.sin(angle) * SPAWN_SPREAD);
+        boolean free = spot.getBlock().isPassable() && spot.clone().add(0, 1, 0).getBlock().isPassable()
+            && !spot.clone().subtract(0, 1, 0).getBlock().isPassable();
+        return free ? spot : center;
+    }
+
+    private boolean isTeamFight() {
+        return this.teams.get(0).size() > 1 || this.teams.get(1).size() > 1;
+    }
+
+    private Component teamNames(int team) {
+        return Component.join(
+            JoinConfiguration.separator(Component.text(", ", NamedTextColor.GRAY)),
+            this.teams.get(team).stream().map(uuid -> Component.text(this.names.get(uuid), Style.PAD_TEXT_COLORS[team])).toList()
+        );
+    }
+
+    /**
+     * Short form for bossbar and displays: names in a duel, "Rot 2/3" in a team fight.
+     */
+    Component headline() {
+        if(!this.isTeamFight()) {
+            return this.teamNames(0).append(Component.text(" gegen ", NamedTextColor.GRAY)).append(this.teamNames(1));
+        }
+        return Component.text("Rot " + this.alive.get(0).size() + "/" + this.teams.get(0).size(), Style.PAD_TEXT_COLORS[0])
+            .append(Component.text(" gegen ", NamedTextColor.GRAY))
+            .append(Component.text("Blau " + this.alive.get(1).size() + "/" + this.teams.get(1).size(), Style.PAD_TEXT_COLORS[1]));
+    }
+
+    int secondsLeft() {
+        return this.secondsLeft;
+    }
+
+    boolean isOver() {
+        return this.over;
+    }
+
+    boolean involves(UUID player) {
+        return this.teams.get(0).contains(player) || this.teams.get(1).contains(player);
+    }
+
+    boolean isAlive(UUID player) {
+        return this.alive.get(0).contains(player) || this.alive.get(1).contains(player);
+    }
+
+    boolean sameTeam(UUID a, UUID b) {
+        int team = this.teamOf(a);
+        return team != -1 && team == this.teamOf(b);
+    }
+
+    Region region() {
+        return this.slot.settings.region();
+    }
+
+    ArenaSlot slot() {
+        return this.slot;
+    }
+
+    private void tickSecond() {
+        if(this.over) return;
+        if(--this.secondsLeft <= 0) {
+            this.timeUp();
+            return;
+        }
+        if(this.secondsLeft == 60 || this.secondsLeft == 10) {
+            this.alivePlayers().forEach(player -> {
+                player.sendActionBar(Component.text("Noch " + this.secondsLeft + " Sekunden", NamedTextColor.YELLOW));
+                Style.play(player, Sound.BLOCK_NOTE_BLOCK_HAT, 0.8f);
+            });
+        }
+        this.updateBossBar();
+    }
+
+    /**
+     * More survivors win, then more hearts left, otherwise a draw.
+     */
+    private void timeUp() {
+        int red = this.alive.get(0).size();
+        int blue = this.alive.get(1).size();
+        if(red != blue) {
+            this.finish(red > blue ? 0 : 1, Component.text("(Zeit abgelaufen, mehr Überlebende)", NamedTextColor.GRAY));
+            return;
+        }
+        double redHealth = this.health(0);
+        double blueHealth = this.health(1);
+        if(Math.abs(redHealth - blueHealth) >= 0.5) {
+            this.finish(redHealth > blueHealth ? 0 : 1, Component.text("(Zeit abgelaufen, mehr Herzen übrig)", NamedTextColor.GRAY));
+            return;
+        }
+        this.finish(-1, Component.text("Die Zeit ist abgelaufen.", NamedTextColor.GRAY));
+    }
+
+    private double health(int team) {
+        return this.alive.get(team).stream()
+            .map(Bukkit::getPlayer)
+            .filter(player -> player != null)
+            .mapToDouble(player -> player.getHealth() + player.getAbsorptionAmount())
+            .sum();
+    }
+
+    private void updateBossBar() {
+        this.bossBar.name(this.headline().append(Component.text("   " + Style.time(this.secondsLeft), NamedTextColor.WHITE)));
+        this.bossBar.progress(Math.clamp((float) this.secondsLeft / this.arena.settings().fightSeconds(), 0f, 1f));
+
+        Set<UUID> viewers = new HashSet<>();
+        for(Player player : this.arena.worlds().play().getPlayers()) {
+            if(this.isAlive(player.getUniqueId()) || this.isSpectating(player)) viewers.add(player.getUniqueId());
+        }
+        for(UUID uuid : this.bossBarViewers) {
+            Player player = Bukkit.getPlayer(uuid);
+            if(player != null && !viewers.contains(uuid)) player.hideBossBar(this.bossBar);
+        }
+        for(UUID uuid : viewers) {
+            Player player = Bukkit.getPlayer(uuid);
+            if(player != null) player.showBossBar(this.bossBar);
+        }
+        this.bossBarViewers.clear();
+        this.bossBarViewers.addAll(viewers);
+    }
+
+    private boolean isSpectating(Player player) {
+        if(this.arena.state(player) != Arena.PlayerState.TRIBUNE && this.arena.state(player) != Arena.PlayerState.PAD) return false;
+        Region region = this.slot.settings.region();
+        double dx = Math.max(0, Math.max(region.minX() - player.getX(), player.getX() - (region.maxX() + 1)));
+        double dz = Math.max(0, Math.max(region.minZ() - player.getZ(), player.getZ() - (region.maxZ() + 1)));
+        return Math.hypot(dx, dz) <= SPECTATOR_RANGE;
+    }
+
+    /**
+     * The player took lethal damage: out of the fight and back to the tribune.
+     */
+    void defeated(Player player) {
+        this.knockOut(player, Component.empty(), "ist ausgeschieden");
+    }
+
+    /**
+     * The player got out of the box, for example by glitching through a wall with an ender pearl.
+     */
+    void leftBox(Player player) {
+        this.knockOut(player, Component.text("Du hast die Arena verlassen", NamedTextColor.GRAY), "hat die Arena verlassen");
+    }
+
+    private void knockOut(Player player, Component subtitle, String what) {
+        if(this.over || !this.eliminate(player.getUniqueId())) return;
+        player.showTitle(Title.title(Component.text("Ausgeschieden", NamedTextColor.RED), subtitle));
+        Style.play(player, Sound.BLOCK_BEACON_DEACTIVATE, 1f);
+        this.arena.toTribune(player);
+        this.announceElimination(player.getUniqueId(), what);
+        this.checkEnd();
+    }
+
+    /**
+     * The player left the server during the fight.
+     */
+    void forfeit(UUID quitter) {
+        if(this.over || !this.eliminate(quitter)) return;
+        this.announceElimination(quitter, "hat die Arena verlassen");
+        this.checkEnd();
+    }
+
+    private boolean eliminate(UUID player) {
+        int team = this.teamOf(player);
+        return team != -1 && this.alive.get(team).remove(player);
+    }
+
+    private void announceElimination(UUID player, String what) {
+        if(!this.isTeamFight()) return;
+        int team = this.teamOf(player);
+        Component message = Component.text(this.names.get(player), Style.PAD_TEXT_COLORS[team])
+            .append(Component.text(" " + what + ". ", NamedTextColor.GRAY))
+            .append(this.headline());
+        this.alivePlayers().forEach(fighter -> fighter.sendActionBar(message));
+        this.updateBossBar();
+    }
+
+    private void checkEnd() {
+        if(this.over) return;
+        boolean redOut = this.alive.get(0).isEmpty();
+        boolean blueOut = this.alive.get(1).isEmpty();
+        if(redOut && blueOut) this.finish(-1, Component.text("Niemand ist mehr übrig.", NamedTextColor.GRAY));
+        else if(redOut) this.finish(1, this.detail(1));
+        else if(blueOut) this.finish(0, this.detail(0));
+    }
+
+    private Component detail(int winner) {
+        String hearts = Style.hearts(this.health(winner));
+        String survivors = this.isTeamFight() ? this.alive.get(winner).size() + " übrig, " : "";
+        return Component.text("(" + this.mode.displayName(this.isTeamFight()) + ", " + survivors + hearts + " ❤)", NamedTextColor.GRAY);
+    }
+
+    /**
+     * Ends the fight without a winner and without celebration, for example on shutdown.
+     */
+    void abort() {
+        if(this.over) return;
+        this.over = true;
+        this.stopTimer();
+        this.hideBossBar();
+        this.alivePlayers().forEach(this.arena::toTribune);
+        this.slot.fight = null;
+    }
+
+    private void finish(int winner, Component detail) {
+        this.over = true;
+        this.stopTimer();
+
+        if(winner == -1) {
+            Bukkit.broadcast(Style.message(
+                this.teamNames(0).append(Component.text(" und ", NamedTextColor.GRAY)).append(this.teamNames(1))
+                    .append(Component.text(" trennen sich unentschieden. ", NamedTextColor.GRAY)).append(detail)
+            ));
+            this.alivePlayers().forEach(player -> {
+                player.showTitle(Title.title(Component.text("Unentschieden", NamedTextColor.YELLOW), detail));
+                Style.play(player, Sound.BLOCK_BEACON_DEACTIVATE, 1f);
+                this.arena.toTribune(player);
+            });
+            this.afterCelebration();
+            return;
+        }
+
+        int loser = 1 - winner;
+        boolean plural = this.teams.get(winner).size() > 1;
+        Bukkit.broadcast(Style.message(
+            this.teamNames(winner)
+                .append(Component.text(plural ? " gewinnen gegen " : " hat gegen ", NamedTextColor.GRAY))
+                .append(this.teamNames(loser))
+                .append(Component.text(plural ? " " : " gewonnen ", NamedTextColor.GRAY))
+                .append(detail)
+        ));
+
+        for(UUID uuid : this.teams.get(loser)) {
+            Player player = Bukkit.getPlayer(uuid);
+            if(player == null) continue;
+            player.showTitle(Title.title(Component.text("Verloren", NamedTextColor.RED), Component.empty()));
+            if(this.alive.get(loser).contains(uuid)) this.arena.toTribune(player);
+        }
+        for(UUID uuid : this.teams.get(winner)) {
+            Player player = Bukkit.getPlayer(uuid);
+            if(player == null) continue;
+            player.showTitle(Title.title(
+                Component.text("Gewonnen!", NamedTextColor.GOLD),
+                Component.text("gegen ", NamedTextColor.GRAY).append(this.teamNames(loser))
+            ));
+            Style.play(player, Sound.UI_TOAST_CHALLENGE_COMPLETE, 1f);
+            if(this.alive.get(winner).contains(uuid)) this.celebrate(player.getLocation(), Style.PAD_PARTICLE_COLORS[winner]);
+        }
+        this.afterCelebration();
+    }
+
+    private void celebrate(Location location, Color color) {
+        Location top = location.clone().add(0, 2.2, 0);
+        Particle.FIREWORK.builder().location(top).count(40).offset(0.6, 0.6, 0.6).extra(0.15).receivers(64).spawn();
+        Particle.DUST.builder().location(top).count(60).offset(1, 1, 1).data(new Particle.DustOptions(color, 1.6f)).receivers(64).spawn();
+        Style.play(top, Sound.ENTITY_FIREWORK_ROCKET_TWINKLE, 2f, 1f);
+        Style.play(top, Sound.ENTITY_FIREWORK_ROCKET_LARGE_BLAST, 2f, 1f);
+    }
+
+    private void hideBossBar() {
+        this.bossBarViewers.forEach(uuid -> {
+            Player player = Bukkit.getPlayer(uuid);
+            if(player != null) player.hideBossBar(this.bossBar);
+        });
+        this.bossBarViewers.clear();
+    }
+
+    private void afterCelebration() {
+        this.hideBossBar();
+        Bukkit.getScheduler().runTaskLater(Main.instance(), () -> {
+            for(Player player : this.alivePlayers()) {
+                if(this.arena.fightOf(player) == this && this.arena.state(player) == Arena.PlayerState.FIGHT) this.arena.toTribune(player);
+            }
+            this.slot.fight = null;
+            this.arena.resetSlot(this.slot);
+        }, CELEBRATION_TICKS);
+    }
+
+    private void stopTimer() {
+        if(this.timer != null) this.timer.cancel();
+        this.timer = null;
+    }
+
+    private int teamOf(UUID player) {
+        if(this.teams.get(0).contains(player)) return 0;
+        if(this.teams.get(1).contains(player)) return 1;
+        return -1;
+    }
+
+    private List<Player> alivePlayers() {
+        List<Player> players = new ArrayList<>();
+        for(Set<UUID> team : this.alive) {
+            for(UUID uuid : team) {
+                Player player = Bukkit.getPlayer(uuid);
+                if(player != null) players.add(player);
+            }
+        }
+        return players;
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/FightListener.java

@@ -0,0 +1,111 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.Region;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import io.papermc.paper.datacomponent.DataComponentTypes;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.entity.Projectile;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.PlayerDeathEvent;
+import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.event.player.PlayerRespawnEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
+import org.bukkit.inventory.ItemStack;
+
+/**
+ * Lethal damage ends the fight instead of killing the player. Totems still work as usual.
+ */
+class FightListener extends ApplianceListener<Arena> {
+    private boolean isFighting(Player player) {
+        Fight fight = this.getAppliance().fightOf(player);
+        return fight != null && !fight.isOver() && fight.isAlive(player.getUniqueId());
+    }
+
+    /**
+     * Only fighters hit each other, and never their own team directly. Explosions still hurt everyone.
+     */
+    @EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+    public void onDamageByPlayer(EntityDamageByEntityEvent event) {
+        if(!(event.getEntity() instanceof Player victim)) return;
+        Player attacker = switch(event.getDamager()) {
+            case Player player -> player;
+            case Projectile projectile when projectile.getShooter() instanceof Player shooter -> shooter;
+            default -> null;
+        };
+        if(attacker == null || attacker == victim) return;
+        Fight fight = this.getAppliance().fightOf(attacker);
+        if(!this.isFighting(attacker) || fight.sameTeam(attacker.getUniqueId(), victim.getUniqueId())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onDamage(EntityDamageEvent event) {
+        if(!(event.getEntity() instanceof Player player)) return;
+        if(this.getAppliance().state(player) != Arena.PlayerState.FIGHT) return;
+        Fight fight = this.getAppliance().fightOf(player);
+        if(fight == null || fight.isOver()) {
+            event.setCancelled(true);
+            return;
+        }
+        if(event.getFinalDamage() < player.getHealth()) return;
+        if(this.hasDeathProtection(player.getInventory().getItemInMainHand())
+            || this.hasDeathProtection(player.getInventory().getItemInOffHand())) return;
+
+        event.setCancelled(true);
+        fight.defeated(player);
+    }
+
+    private boolean hasDeathProtection(ItemStack item) {
+        return !item.isEmpty() && item.hasData(DataComponentTypes.DEATH_PROTECTION);
+    }
+
+    /**
+     * Safety net if a death gets through anyway: nothing drops and the fight ends.
+     */
+    @EventHandler
+    public void onDeath(PlayerDeathEvent event) {
+        event.setKeepInventory(true);
+        event.getDrops().clear();
+        event.setKeepLevel(true);
+        event.setDroppedExp(0);
+        event.deathMessage(null);
+        Fight fight = this.getAppliance().fightOf(event.getPlayer());
+        if(fight != null) fight.defeated(event.getPlayer());
+    }
+
+    @EventHandler
+    public void onRespawn(PlayerRespawnEvent event) {
+        Bukkit.getScheduler().runTask(Main.instance(), () -> this.getAppliance().toTribune(event.getPlayer()));
+    }
+
+    /**
+     * Ender pearls and chorus fruits must not leave the arena.
+     */
+    @EventHandler(ignoreCancelled = true)
+    public void onTeleport(PlayerTeleportEvent event) {
+        if(event.getCause() == PlayerTeleportEvent.TeleportCause.PLUGIN || event.getCause() == PlayerTeleportEvent.TeleportCause.COMMAND) return;
+        if(this.getAppliance().state(event.getPlayer()) != Arena.PlayerState.FIGHT) return;
+        Region region = this.getAppliance().arenaRegionOf(event.getPlayer());
+        if(region == null) return;
+        if(event.getTo().getWorld() != event.getFrom().getWorld() || !region.contains(event.getTo().getX(), event.getTo().getY(), event.getTo().getZ())) {
+            event.setCancelled(true);
+        }
+    }
+
+    /**
+     * Whoever ends up outside the box anyway (ender pearl through a wall or corner) loses.
+     */
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onMove(PlayerMoveEvent event) {
+        if(!event.hasChangedBlock()) return;
+        Player player = event.getPlayer();
+        if(this.getAppliance().state(player) != Arena.PlayerState.FIGHT || !this.isFighting(player)) return;
+        Fight fight = this.getAppliance().fightOf(player);
+        if(event.getTo().getWorld() == this.getAppliance().worlds().play() && fight.region().contains(event.getTo().getX(), event.getTo().getY(), event.getTo().getZ())) return;
+        fight.leftBox(player);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/InventoryStore.java

@@ -0,0 +1,43 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Inventory copies sent by the main server. Kept in memory only: after a restart of the arena server
+ * players arrive with an empty inventory until they come over again.
+ */
+final class InventoryStore {
+    static final int MAX_BYTES = 16 * 1024 * 1024;
+    private static final Map<UUID, byte[]> snapshots = new ConcurrentHashMap<>();
+
+    private InventoryStore() {
+    }
+
+    static void put(UUID player, byte[] serializedItems) {
+        if(serializedItems.length > MAX_BYTES) throw new IllegalArgumentException("Inventory too large");
+        snapshots.put(player, serializedItems);
+    }
+
+    /**
+     * @return a fresh copy of the player's inventory, empty if none was sent
+     */
+    static ItemStack[] get(UUID player) {
+        byte[] bytes = snapshots.get(player);
+        if(bytes == null) return new ItemStack[0];
+        return ItemStack.deserializeItemsFromBytes(bytes);
+    }
+
+    static void apply(Player player, UUID source) {
+        ItemStack[] items = get(source);
+        int size = player.getInventory().getSize();
+        ItemStack[] contents = new ItemStack[size];
+        System.arraycopy(items, 0, contents, 0, Math.min(items.length, size));
+        player.getInventory().setContents(contents);
+        player.setItemOnCursor(null);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/Lobby.java

@@ -0,0 +1,410 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.FightMode;
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.PadLobby;
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.Region;
+import eu.mhsl.craftattack.spawn.core.util.world.InteractSounds;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.JoinConfiguration;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.title.Title;
+import org.bukkit.Bukkit;
+import org.bukkit.Color;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Sound;
+import org.bukkit.entity.Player;
+import org.bukkit.entity.TextDisplay;
+import org.bukkit.util.Vector;
+import org.jetbrains.annotations.Nullable;
+
+import java.time.Duration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+
+/**
+ * The two start pads in the world: who stands where, pushing others away from taken pads,
+ * inventories, countdown, texts, particles and sounds. The rules themselves live in {@link PadLobby}.
+ */
+final class Lobby implements PadLobby.Listener {
+    /** How far around a taken pad other players get pushed away. */
+    private static final double PUSH_MARGIN = 0.4;
+    /** How long a full lobby waits for the challenger to close the options. */
+    private static final int CHOOSING_SECONDS = 20;
+    /** Whoever keeps the options open this long without clicking anything gets sent off the pad. */
+    private static final int MENU_IDLE_TICKS = 60 * 20;
+
+    private final Arena arena;
+    private final Region[] regions;
+    private final PadLobby pads;
+    private final TextDisplay[] displays = new TextDisplay[PadLobby.PADS];
+    private final Map<UUID, Long> lastPushSound = new HashMap<>();
+    private long ticks;
+    private @Nullable UUID menuViewer;
+    private int menuIdleTicks;
+
+    Lobby(Arena arena, Region[] regions) {
+        this.arena = arena;
+        this.regions = regions;
+        this.pads = new PadLobby(this, arena.settings().countdownSeconds(), CHOOSING_SECONDS);
+        for(int i = 0; i < PadLobby.PADS; i++) {
+            Region region = regions[i];
+            this.displays[i] = Displays.spawn(new Location(arena.worlds().play(), region.centerX(), region.maxY() + 2.6, region.centerZ()));
+        }
+    }
+
+    void tick() {
+        this.ticks++;
+        for(Player player : this.arena.worlds().play().getPlayers()) {
+            Arena.PlayerState state = this.arena.state(player);
+            if(state == Arena.PlayerState.PAD) this.checkLeave(player);
+            else if(state == Arena.PlayerState.TRIBUNE) this.checkEnter(player);
+        }
+
+        this.checkMenuIdle();
+        this.pads.tick(this.arena.hasFreeSlot());
+
+        if(this.ticks % 3 == 0) this.drawParticles();
+        if(this.ticks % 5 == 0) this.updateDisplays();
+    }
+
+    private void checkMenuIdle() {
+        if(this.menuViewer == null || ++this.menuIdleTicks < MENU_IDLE_TICKS) return;
+        Player player = Bukkit.getPlayer(this.menuViewer);
+        this.menuViewer = null;
+        if(player == null || !ModeMenu.isOpen(player)) return;
+        this.arena.toTribune(player);
+        player.sendMessage(Style.message("Du hast eine Minute lang nichts ausgewählt und wurdest vom Feld geschickt."));
+        Style.play(player, Sound.BLOCK_NOTE_BLOCK_BASS, 0.6f);
+    }
+
+    private void checkLeave(Player player) {
+        int pad = this.pads.padOf(player.getUniqueId());
+        if(pad != -1 && this.isOn(player, pad, 0)) return;
+        this.leave(player);
+    }
+
+    private void checkEnter(Player player) {
+        for(int pad = 0; pad < PadLobby.PADS; pad++) {
+            if(this.pads.isPadFull(pad)) {
+                if(this.isOn(player, pad, PUSH_MARGIN)) this.pushAway(player, pad);
+                continue;
+            }
+            if(!this.isOn(player, pad, 0)) continue;
+            if(!this.pads.enter(pad, player.getUniqueId())) continue;
+
+            this.arena.setState(player, Arena.PlayerState.PAD);
+            this.arena.teams().join(player, Teams.pad(pad));
+            Style.play(player, Sound.BLOCK_NOTE_BLOCK_PLING, 1.4f);
+            if(this.pads.isWaitingForChallenger()) {
+                player.sendActionBar(this.choosingText());
+            } else if(!player.getUniqueId().equals(this.pads.challenger())) {
+                player.sendActionBar(Component.text(Style.PAD_NAMES[pad] + " " + this.pads.players(pad).size() + "/" + this.pads.size(pad)
+                    + ", Modus: " + this.modeName(), Style.PAD_TEXT_COLORS[pad]));
+            }
+            return;
+        }
+    }
+
+    /**
+     * Removes the player from the pad, if standing on one.
+     */
+    void leave(Player player) {
+        if(this.pads.padOf(player.getUniqueId()) == -1) return;
+        this.pads.leave(player.getUniqueId());
+        if(ModeMenu.isOpen(player)) player.closeInventory();
+        this.arena.teams().leave(player);
+        this.arena.setState(player, Arena.PlayerState.TRIBUNE);
+    }
+
+    void handleMenuClick(Player player, ModeMenu menu, ModeMenu.Click click) {
+        int ownSize = menu.ownSize;
+        int opponentSize = menu.opponentSize;
+        FightMode mode = menu.mode;
+        this.menuIdleTicks = 0;
+        switch(click) {
+            case ModeMenu.OwnSize(int size) -> ownSize = size;
+            case ModeMenu.OpponentSize(int size) -> opponentSize = size;
+            case ModeMenu.Mode(FightMode chosen) -> mode = chosen;
+            case ModeMenu.Done() -> {
+                InteractSounds.of(player).success();
+                player.closeInventory();
+                player.sendActionBar(Component.text(this.pads.size(this.pads.challengerPad()) + " gegen " + this.pads.size(1 - this.pads.challengerPad())
+                    + ", Modus: " + this.modeName() + ". Rechtsklick öffnet die Auswahl wieder.", NamedTextColor.GOLD));
+                return;
+            }
+        }
+        // switching to teams drops the opponent's inventory mode
+        if(!mode.isAllowed(ownSize, opponentSize)) mode = FightMode.OWN;
+
+        int ownPad = this.pads.challengerPad();
+        String problem = switch(this.pads.configure(player.getUniqueId(), ownSize, opponentSize, mode)) {
+            case OK -> null;
+            case NOT_ALLOWED -> "Der Countdown läuft schon";
+            case OWN_TOO_SMALL -> "Auf deinem Feld stehen schon " + this.pads.players(ownPad).size();
+            case OPPONENT_TOO_SMALL -> "Auf dem anderen Feld stehen schon " + this.pads.players(1 - ownPad).size();
+            case INVALID -> "Das geht so nicht";
+        };
+        if(problem != null) {
+            Style.play(player, Sound.BLOCK_NOTE_BLOCK_BASS, 0.6f);
+            player.sendActionBar(Component.text(problem, NamedTextColor.RED));
+            if(!this.pads.canConfigure(player.getUniqueId())) player.closeInventory();
+            return;
+        }
+        menu.ownSize = ownSize;
+        menu.opponentSize = opponentSize;
+        menu.mode = mode;
+        menu.draw();
+        InteractSounds.of(player).click();
+    }
+
+    /**
+     * Right click on the pad: the challenger opens the options again.
+     */
+    boolean openMenu(Player player) {
+        if(!this.pads.canConfigure(player.getUniqueId()) || ModeMenu.isOpen(player)) return false;
+        int pad = this.pads.challengerPad();
+        InteractSounds.of(player).open();
+        ModeMenu.open(player, pad, this.pads.size(pad), this.pads.size(1 - pad), this.pads.mode());
+        this.menuViewer = player.getUniqueId();
+        this.menuIdleTicks = 0;
+        this.pads.setChoosing(player.getUniqueId(), true);
+        return true;
+    }
+
+    /**
+     * The challenger closed the options: a full lobby starts counting down now.
+     */
+    void menuClosed(Player player) {
+        if(player.getUniqueId().equals(this.menuViewer)) this.menuViewer = null;
+        this.pads.setChoosing(player.getUniqueId(), false);
+    }
+
+    private Component choosingText() {
+        Player challenger = this.pads.challenger() == null ? null : Bukkit.getPlayer(this.pads.challenger());
+        String name = challenger == null ? "Der Herausforderer" : challenger.getName();
+        return Component.text(name + " wählt noch Teams und Modus", NamedTextColor.YELLOW);
+    }
+
+    private boolean isTeamFight() {
+        return this.pads.size(0) > 1 || this.pads.size(1) > 1;
+    }
+
+    private String modeName() {
+        return this.pads.mode().displayName(this.isTeamFight());
+    }
+
+    boolean isIdle() {
+        return this.pads.isIdle();
+    }
+
+    void shutdown() {
+        for(int pad = 0; pad < PadLobby.PADS; pad++) this.playersOn(pad).forEach(this::leave);
+        for(TextDisplay display : this.displays) display.remove();
+    }
+
+    private boolean isOn(Player player, int pad, double margin) {
+        Region region = this.regions[pad];
+        return player.getX() >= region.minX() - margin && player.getX() < region.maxX() + 1 + margin
+            && player.getZ() >= region.minZ() - margin && player.getZ() < region.maxZ() + 1 + margin
+            && player.getY() >= region.minY() - 0.5 && player.getY() < region.maxY() + 2;
+    }
+
+    private void pushAway(Player player, int pad) {
+        Region region = this.regions[pad];
+        Vector direction = new Vector(player.getX() - region.centerX(), 0, player.getZ() - region.centerZ());
+        if(direction.lengthSquared() < 0.01) direction = new Vector(1, 0, 0);
+        player.setVelocity(direction.normalize().multiply(0.6).setY(0.25));
+
+        long now = System.currentTimeMillis();
+        if(now - this.lastPushSound.getOrDefault(player.getUniqueId(), 0L) < 1000) return;
+        this.lastPushSound.put(player.getUniqueId(), now);
+        Style.play(player, Sound.BLOCK_NOTE_BLOCK_BASS, 0.6f);
+        player.sendActionBar(Component.text("Dieses Feld ist voll", NamedTextColor.RED));
+    }
+
+    @Override
+    public void challengerSelected(UUID challenger, boolean first) {
+        Player player = Bukkit.getPlayer(challenger);
+        if(player == null) return;
+        if(!first) {
+            player.sendMessage(Style.message("Du führst jetzt die Herausforderung an. Rechtsklick auf dem Feld öffnet die Auswahl."));
+            Style.play(player, Sound.BLOCK_NOTE_BLOCK_PLING, 1.8f);
+            return;
+        }
+        player.sendMessage(Style.message("Du forderst heraus. Wähle Teamgröße und Modus, Rechtsklick auf dem Feld öffnet die Auswahl wieder. Wer sich auf die Felder stellt, macht mit."));
+        this.openMenu(player);
+    }
+
+    @Override
+    public void waitingForChallenger() {
+        UUID challenger = this.pads.challenger();
+        Player player = challenger == null ? null : Bukkit.getPlayer(challenger);
+        if(player != null && player.getOpenInventory().getTopInventory().getHolder(false) instanceof ModeMenu menu) {
+            menu.everyoneThere = true;
+            menu.draw();
+            Style.play(player, Sound.BLOCK_NOTE_BLOCK_PLING, 1.8f);
+        }
+        for(int pad = 0; pad < PadLobby.PADS; pad++) {
+            this.playersOn(pad).stream()
+                .filter(occupant -> !occupant.getUniqueId().equals(challenger))
+                .forEach(occupant -> occupant.sendActionBar(this.choosingText()));
+        }
+    }
+
+    @Override
+    public void countdownStarted() {
+        UUID challenger = this.pads.challenger();
+        Player player = challenger == null ? null : Bukkit.getPlayer(challenger);
+        if(player != null && ModeMenu.isOpen(player)) player.closeInventory();
+    }
+
+    @Override
+    public void kitAssigned(UUID uuid, UUID kitOwner) {
+        Player player = Bukkit.getPlayer(uuid);
+        if(player == null) return;
+        InventoryStore.apply(player, kitOwner);
+        if(uuid.equals(kitOwner)) return;
+        Player owner = Bukkit.getPlayer(kitOwner);
+        player.sendMessage(Style.message("Du kämpfst mit dem Inventar von " + (owner == null ? "jemand anderem" : owner.getName()) + ". Verlasse das Feld, um abzubrechen."));
+        Style.play(player, Sound.ITEM_ARMOR_EQUIP_NETHERITE, 1f);
+    }
+
+    @Override
+    public void countdown(int secondsLeft) {
+        for(int pad = 0; pad < PadLobby.PADS; pad++) {
+            Component opponents = this.namesOn(1 - pad);
+            for(Player player : this.playersOn(pad)) {
+                player.showTitle(Title.title(
+                    Component.text(secondsLeft, NamedTextColor.GOLD),
+                    Component.text("Kampf gegen ", NamedTextColor.GRAY).append(opponents),
+                    Title.Times.times(Duration.ZERO, Duration.ofMillis(1100), Duration.ZERO)
+                ));
+                Style.play(player, Sound.BLOCK_NOTE_BLOCK_PLING, 0.6f + (this.arena.settings().countdownSeconds() - secondsLeft) * 0.2f);
+            }
+        }
+    }
+
+    @Override
+    public void countdownCancelled() {
+        for(int pad = 0; pad < PadLobby.PADS; pad++) {
+            for(Player player : this.playersOn(pad)) {
+                player.clearTitle();
+                player.sendActionBar(Component.text("Abgebrochen", NamedTextColor.RED));
+                Style.play(player, Sound.BLOCK_NOTE_BLOCK_BASS, 0.5f);
+            }
+        }
+    }
+
+    @Override
+    public void start(List<List<UUID>> teams, UUID challenger, FightMode mode, Map<UUID, UUID> kits) {
+        List<List<Player>> players = teams.stream()
+            .map(team -> team.stream().map(Bukkit::getPlayer).filter(Objects::nonNull).toList())
+            .toList();
+        if(players.get(0).isEmpty() || players.get(1).isEmpty()) {
+            players.forEach(team -> team.forEach(this.arena::toTribune));
+            return;
+        }
+        this.arena.startFight(players, mode, kits);
+    }
+
+    private List<Player> playersOn(int pad) {
+        return this.pads.players(pad).stream().map(Bukkit::getPlayer).filter(Objects::nonNull).toList();
+    }
+
+    private Component namesOn(int pad) {
+        return Component.join(
+            JoinConfiguration.separator(Component.text(", ", NamedTextColor.GRAY)),
+            this.playersOn(pad).stream().map(player -> Component.text(player.getName(), Style.PAD_TEXT_COLORS[pad])).toList()
+        );
+    }
+
+    private void updateDisplays() {
+        boolean waiting = this.pads.isFull() && !this.arena.hasFreeSlot();
+        Player challenger = this.pads.challenger() == null ? null : Bukkit.getPlayer(this.pads.challenger());
+        int challengerPad = this.pads.challengerPad();
+        String modeText = "Modus: " + this.modeName();
+
+        for(int pad = 0; pad < PadLobby.PADS; pad++) {
+            List<Player> players = this.playersOn(pad);
+            Component title = Component.text(Style.PAD_NAMES[pad], Style.PAD_TEXT_COLORS[pad]);
+            if(challenger != null) title = title.append(Component.text("  " + players.size() + "/" + this.pads.size(pad), NamedTextColor.WHITE));
+
+            Component body;
+            if(waiting) {
+                body = this.namesOn(pad).appendNewline()
+                    .append(Component.text("Alle Arenen belegt, gleich geht es los", NamedTextColor.GRAY));
+            } else if(this.pads.isWaitingForChallenger() && challenger != null) {
+                body = this.namesOn(pad).appendNewline()
+                    .append(Component.text(challenger.getName() + " wählt noch", NamedTextColor.YELLOW));
+            } else if(this.pads.isCountingDown()) {
+                body = this.namesOn(pad).appendNewline()
+                    .append(Component.text("Kampf beginnt in " + this.pads.secondsLeft(), NamedTextColor.GOLD));
+            } else if(challenger == null) {
+                body = !this.arena.hasFreeSlot()
+                    ? Component.text("Alle Arenen belegt", NamedTextColor.GRAY).appendNewline()
+                        .append(Component.text("Du kannst dich trotzdem anstellen", NamedTextColor.WHITE))
+                    : Component.text("Stell dich hierhin,", NamedTextColor.WHITE).appendNewline()
+                        .append(Component.text("um herauszufordern", NamedTextColor.WHITE));
+            } else if(pad == challengerPad) {
+                body = this.namesOn(pad).appendNewline()
+                    .append(Component.text(players.size() == 1 ? "fordert heraus" : "fordern heraus", NamedTextColor.GRAY)).appendNewline()
+                    .append(Component.text(modeText, NamedTextColor.WHITE));
+            } else {
+                Component who = players.isEmpty()
+                    ? Component.text("Stell dich hierhin, um gegen", NamedTextColor.WHITE).appendNewline()
+                        .append(Component.text(challenger.getName(), Style.PAD_TEXT_COLORS[challengerPad]))
+                        .append(Component.text(" zu kämpfen", NamedTextColor.WHITE))
+                    : this.namesOn(pad).appendNewline().append(Component.text("nehmen an", NamedTextColor.GRAY));
+                body = who.appendNewline().append(Component.text(modeText, NamedTextColor.GRAY));
+            }
+            this.displays[pad].text(title.appendNewline().append(body));
+        }
+    }
+
+    private void drawParticles() {
+        boolean waiting = this.pads.isFull() && !this.arena.hasFreeSlot();
+        boolean countdown = this.pads.isCountingDown() && !waiting;
+        for(int pad = 0; pad < PadLobby.PADS; pad++) {
+            Region region = this.regions[pad];
+            Color color = waiting ? Style.WAITING_PARTICLE_COLOR : Style.PAD_PARTICLE_COLORS[pad];
+            boolean full = this.pads.isPadFull(pad);
+            double spacing = countdown ? 0.25 : full ? 0.4 : 0.6;
+            this.drawOutline(region, new Particle.DustOptions(color, full ? 1.2f : 0.9f), spacing);
+
+            double speed = countdown ? 0.6 : 0.3;
+            for(Player occupant : this.playersOn(pad)) {
+                for(int strand = 0; strand < 2; strand++) {
+                    double angle = this.ticks * speed + strand * Math.PI;
+                    double height = (this.ticks % 40) / 20.0;
+                    Location point = occupant.getLocation().add(Math.cos(angle) * 0.7, height, Math.sin(angle) * 0.7);
+                    Particle.DUST.builder().location(point).data(new Particle.DustOptions(color, 1f)).receivers(48).spawn();
+                }
+            }
+        }
+    }
+
+    private void drawOutline(Region region, Particle.DustOptions dust, double spacing) {
+        double y = region.minY() + 0.1;
+        double minX = region.minX();
+        double maxX = region.maxX() + 1;
+        double minZ = region.minZ();
+        double maxZ = region.maxZ() + 1;
+        Location location = new Location(this.arena.worlds().play(), 0, y, 0);
+        for(double x = minX; x <= maxX; x += spacing) {
+            this.dust(location.set(x, y, minZ), dust);
+            this.dust(location.set(x, y, maxZ), dust);
+        }
+        for(double z = minZ; z <= maxZ; z += spacing) {
+            this.dust(location.set(minX, y, z), dust);
+            this.dust(location.set(maxX, y, z), dust);
+        }
+    }
+
+    private void dust(Location location, Particle.DustOptions dust) {
+        Particle.DUST.builder().location(location).data(dust).receivers(48).spawn();
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/LockListener.java

@@ -0,0 +1,99 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityPickupItemEvent;
+import org.bukkit.event.entity.EntityToggleGlideEvent;
+import org.bukkit.event.entity.FoodLevelChangeEvent;
+import org.bukkit.event.entity.ProjectileLaunchEvent;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.inventory.InventoryDragEvent;
+import org.bukkit.event.inventory.InventoryOpenEvent;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.event.player.PlayerItemConsumeEvent;
+import org.bukkit.event.player.PlayerSwapHandItemsEvent;
+
+/**
+ * Outside of a fight the inventory can be looked at, but nothing can be moved, dropped or used.
+ * Nobody takes damage or gets hungry on the tribune.
+ */
+class LockListener extends ApplianceListener<Arena> {
+    private boolean isLocked(Object entity) {
+        if(!(entity instanceof Player player)) return false;
+        Arena.PlayerState state = this.getAppliance().state(player);
+        return state == Arena.PlayerState.TRIBUNE || state == Arena.PlayerState.PAD;
+    }
+
+    private void cancelIfLocked(Object entity, Cancellable event) {
+        if(this.isLocked(entity)) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onClick(InventoryClickEvent event) {
+        this.cancelIfLocked(event.getWhoClicked(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onDrag(InventoryDragEvent event) {
+        this.cancelIfLocked(event.getWhoClicked(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onDrop(PlayerDropItemEvent event) {
+        this.cancelIfLocked(event.getPlayer(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onSwapHands(PlayerSwapHandItemsEvent event) {
+        this.cancelIfLocked(event.getPlayer(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onInteract(PlayerInteractEvent event) {
+        this.cancelIfLocked(event.getPlayer(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onConsume(PlayerItemConsumeEvent event) {
+        this.cancelIfLocked(event.getPlayer(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onPickup(EntityPickupItemEvent event) {
+        this.cancelIfLocked(event.getEntity(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onLaunch(ProjectileLaunchEvent event) {
+        this.cancelIfLocked(event.getEntity().getShooter(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onGlide(EntityToggleGlideEvent event) {
+        if(event.isGliding()) this.cancelIfLocked(event.getEntity(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onHunger(FoodLevelChangeEvent event) {
+        this.cancelIfLocked(event.getEntity(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW)
+    public void onDamage(EntityDamageEvent event) {
+        this.cancelIfLocked(event.getEntity(), event);
+    }
+
+    /**
+     * Ender chests would keep items between fights.
+     */
+    @EventHandler
+    public void onOpen(InventoryOpenEvent event) {
+        if(event.getInventory().getType() == InventoryType.ENDER_CHEST) event.setCancelled(true);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/ModeMenu.java

@@ -0,0 +1,150 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.FightMode;
+import eu.mhsl.craftattack.spawn.arena.appliances.arena.logic.PadLobby;
+import eu.mhsl.craftattack.spawn.core.util.inventory.ItemBuilder;
+import eu.mhsl.craftattack.spawn.core.util.inventory.PlaceholderItems;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.text.format.TextDecoration;
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.SkullMeta;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Chest menu in which the challenger picks team sizes and mode. Every click applies at once.
+ * Works for Bedrock players as well.
+ */
+final class ModeMenu implements InventoryHolder {
+    private static final int OWN_ROW = 10;
+    private static final int OPPONENT_ROW = 19;
+    private static final int[] MODE_SLOTS = {29, 31, 33};
+    private static final FightMode[] MODES = {FightMode.OWN, FightMode.CHALLENGER, FightMode.OPPONENT};
+    private static final int DONE_SLOT = 40;
+
+    sealed interface Click {
+    }
+
+    record OwnSize(int size) implements Click {
+    }
+
+    record OpponentSize(int size) implements Click {
+    }
+
+    record Mode(FightMode mode) implements Click {
+    }
+
+    record Done() implements Click {
+    }
+
+    private final Inventory inventory;
+    private final Player challenger;
+    private final int ownPad;
+    int ownSize;
+    int opponentSize;
+    FightMode mode;
+    /** Both pads are full, only the challenger closing the menu is missing. */
+    boolean everyoneThere;
+
+    private ModeMenu(Player challenger, int ownPad, int ownSize, int opponentSize, FightMode mode) {
+        this.challenger = challenger;
+        this.ownPad = ownPad;
+        this.ownSize = ownSize;
+        this.opponentSize = opponentSize;
+        this.mode = mode;
+        this.inventory = Bukkit.createInventory(this, 45, Component.text("Teams und Kampfmodus"));
+        this.draw();
+    }
+
+    static void open(Player challenger, int ownPad, int ownSize, int opponentSize, FightMode mode) {
+        challenger.openInventory(new ModeMenu(challenger, ownPad, ownSize, opponentSize, mode).getInventory());
+    }
+
+    static boolean isOpen(Player player) {
+        return player.getOpenInventory().getTopInventory().getHolder(false) instanceof ModeMenu;
+    }
+
+    Click clickAt(int slot) {
+        if(slot > OWN_ROW && slot <= OWN_ROW + PadLobby.MAX_TEAM_SIZE) return new OwnSize(slot - OWN_ROW);
+        if(slot > OPPONENT_ROW && slot <= OPPONENT_ROW + PadLobby.MAX_TEAM_SIZE) return new OpponentSize(slot - OPPONENT_ROW);
+        for(int i = 0; i < MODE_SLOTS.length; i++) {
+            if(MODE_SLOTS[i] == slot) return new Mode(MODES[i]);
+        }
+        if(slot == DONE_SLOT) return new Done();
+        return null;
+    }
+
+    void draw() {
+        for(int i = 0; i < this.inventory.getSize(); i++) this.inventory.setItem(i, PlaceholderItems.grayStainedGlassPane);
+        int opponentPad = 1 - this.ownPad;
+        boolean teams = this.ownSize > 1 || this.opponentSize > 1;
+
+        this.inventory.setItem(OWN_ROW, this.label(Material.PLAYER_HEAD, "Dein Team", this.ownPad, "So viele stehen mit dir auf dem " + Style.PAD_NAMES[this.ownPad] + ".")
+            .withMeta(meta -> ((SkullMeta) meta).setOwningPlayer(this.challenger)).build());
+        this.inventory.setItem(OPPONENT_ROW, this.label(Material.SKELETON_SKULL, "Gegner", opponentPad, "So viele stellen sich auf das " + Style.PAD_NAMES[opponentPad] + ".").build());
+        for(int size = 1; size <= PadLobby.MAX_TEAM_SIZE; size++) {
+            this.inventory.setItem(OWN_ROW + size, this.sizeItem(size, this.ownPad, size == this.ownSize));
+            this.inventory.setItem(OPPONENT_ROW + size, this.sizeItem(size, opponentPad, size == this.opponentSize));
+        }
+
+        for(int i = 0; i < MODES.length; i++) {
+            FightMode mode = MODES[i];
+            this.inventory.setItem(MODE_SLOTS[i], this.modeItem(mode, teams, mode == this.mode, mode.isAllowed(this.ownSize, this.opponentSize)));
+        }
+
+        ItemBuilder done = ItemBuilder.of(Material.LIME_CONCRETE)
+            .displayName(Component.text(this.everyoneThere ? "Fertig, Kampf starten" : "Fertig", NamedTextColor.GREEN).decoration(TextDecoration.ITALIC, false))
+            .lore(this.ownSize + " gegen " + this.opponentSize + ", " + this.mode.displayName(teams) + ". "
+                + (this.everyoneThere ? "Alle sind da, der Countdown startet, sobald du fertig bist." : "Jetzt fehlen nur noch die anderen auf den Feldern."));
+        if(this.everyoneThere) done.glint();
+        this.inventory.setItem(DONE_SLOT, done.build());
+    }
+
+    private ItemBuilder label(Material material, String name, int pad, String text) {
+        return ItemBuilder.of(material)
+            .displayName(Component.text(name, Style.PAD_TEXT_COLORS[pad]).decoration(TextDecoration.ITALIC, false))
+            .lore(text);
+    }
+
+    private ItemStack sizeItem(int size, int pad, boolean selected) {
+        ItemBuilder builder = ItemBuilder.of(pad == 0 ? Material.RED_CONCRETE : Material.BLUE_CONCRETE)
+            .amount(size)
+            .displayName(Component.text(size + " Spieler", Style.PAD_TEXT_COLORS[pad]).decoration(TextDecoration.ITALIC, false));
+        builder.lore(selected ? "Ausgewählt" : "Klicken zum Auswählen", selected ? NamedTextColor.GREEN : NamedTextColor.YELLOW);
+        if(selected) builder.glint();
+        return builder.build();
+    }
+
+    private ItemStack modeItem(FightMode mode, boolean teams, boolean selected, boolean allowed) {
+        ItemBuilder builder = switch(mode) {
+            case OWN -> ItemBuilder.of(Material.IRON_SWORD)
+                .lore("Jeder kämpft mit seinem eigenen Inventar.");
+            case CHALLENGER -> ItemBuilder.of(Material.PLAYER_HEAD)
+                .withMeta(meta -> ((SkullMeta) meta).setOwningPlayer(this.challenger))
+                .lore(teams ? "Alle kämpfen mit deinem Inventar." : "Ihr kämpft beide mit deinem Inventar.");
+            case OPPONENT -> ItemBuilder.of(allowed ? Material.CHEST : Material.BARRIER)
+                .lore(allowed
+                    ? "Ihr kämpft beide mit dem Inventar von dem, der sich auf das andere Feld stellt."
+                    : "Geht nur bei 1 gegen 1.");
+        };
+        builder.displayName(Component.text(mode.displayName(teams), allowed ? NamedTextColor.GOLD : NamedTextColor.DARK_GRAY).decoration(TextDecoration.ITALIC, false));
+        if(!allowed) return builder.build();
+        builder.appendLore(Component.empty());
+        if(selected) {
+            builder.glint().appendLore(Component.text("Ausgewählt", NamedTextColor.GREEN).decoration(TextDecoration.ITALIC, false));
+        } else {
+            builder.appendLore(Component.text("Klicken zum Auswählen", NamedTextColor.YELLOW).decoration(TextDecoration.ITALIC, false));
+        }
+        return builder.build();
+    }
+
+    @Override
+    public @NotNull Inventory getInventory() {
+        return this.inventory;
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/ModeMenuListener.java

@@ -0,0 +1,41 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.inventory.InventoryCloseEvent;
+
+class ModeMenuListener extends ApplianceListener<Arena> {
+    @EventHandler
+    public void onClick(InventoryClickEvent event) {
+        if(!(event.getView().getTopInventory().getHolder(false) instanceof ModeMenu menu)) return;
+        event.setCancelled(true);
+        if(!(event.getWhoClicked() instanceof Player player)) return;
+        if(event.getRawSlot() >= event.getView().getTopInventory().getSize()) return;
+
+        ModeMenu.Click click = menu.clickAt(event.getRawSlot());
+        Lobby lobby = this.getAppliance().lobby();
+        if(click != null && lobby != null) lobby.handleMenuClick(player, menu, click);
+    }
+
+    @EventHandler
+    public void onClose(InventoryCloseEvent event) {
+        if(!(event.getInventory().getHolder(false) instanceof ModeMenu)) return;
+        if(!(event.getPlayer() instanceof Player player)) return;
+        Lobby lobby = this.getAppliance().lobby();
+        if(lobby != null) lobby.menuClosed(player);
+    }
+
+    @EventHandler
+    public void onRightClick(PlayerInteractEvent event) {
+        if(event.getHand() != EquipmentSlot.HAND) return;
+        if(event.getAction() != Action.RIGHT_CLICK_AIR && event.getAction() != Action.RIGHT_CLICK_BLOCK) return;
+        if(this.getAppliance().state(event.getPlayer()) != Arena.PlayerState.PAD) return;
+        Lobby lobby = this.getAppliance().lobby();
+        if(lobby != null && lobby.openMenu(event.getPlayer())) event.setCancelled(true);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/NoProgressListener.java

@@ -0,0 +1,21 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import com.destroystokyo.paper.event.player.PlayerAdvancementCriterionGrantEvent;
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerRecipeDiscoverEvent;
+
+/**
+ * Nothing done in the arena counts as progress: no advancements, no recipe unlocks.
+ */
+class NoProgressListener extends ApplianceListener<Arena> {
+    @EventHandler
+    public void onCriterion(PlayerAdvancementCriterionGrantEvent event) {
+        event.setCancelled(true);
+    }
+
+    @EventHandler
+    public void onRecipe(PlayerRecipeDiscoverEvent event) {
+        event.setCancelled(true);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/PlayerConnectionListener.java

@@ -0,0 +1,22 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+
+class PlayerConnectionListener extends ApplianceListener<Arena> {
+    @EventHandler
+    public void onJoin(PlayerJoinEvent event) {
+        event.getPlayer().getEnderChest().clear();
+        this.getAppliance().toTribune(event.getPlayer());
+        event.getPlayer().sendMessage(Style.message(
+            "Willkommen in der Arena! Stell dich auf ein Startfeld, um jemanden herauszufordern. Zurück geht es beim Villager oder mit /craftattack."
+        ));
+    }
+
+    @EventHandler
+    public void onQuit(PlayerQuitEvent event) {
+        this.getAppliance().handleQuit(event.getPlayer());
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/Style.java

@@ -0,0 +1,55 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.text.format.TextColor;
+import org.bukkit.Color;
+import org.bukkit.Location;
+import org.bukkit.Sound;
+import org.bukkit.entity.Player;
+
+import java.util.Locale;
+
+/**
+ * Colors, texts and sounds of the arena, so everything looks and sounds the same everywhere.
+ * Player facing texts use no dashes.
+ */
+final class Style {
+    static final Component PREFIX = Component.text("[Arena] ", NamedTextColor.GOLD);
+
+    static final NamedTextColor[] PAD_TEXT_COLORS = {NamedTextColor.RED, NamedTextColor.BLUE};
+    static final Color[] PAD_PARTICLE_COLORS = {Color.fromRGB(255, 70, 70), Color.fromRGB(80, 120, 255)};
+    static final String[] PAD_NAMES = {"Rotes Feld", "Blaues Feld"};
+    static final Color WAITING_PARTICLE_COLOR = Color.fromRGB(150, 150, 150);
+
+    private Style() {
+    }
+
+    static Component message(String text) {
+        return PREFIX.append(Component.text(text, NamedTextColor.GRAY));
+    }
+
+    static Component message(Component text) {
+        return PREFIX.append(text.colorIfAbsent(NamedTextColor.GRAY));
+    }
+
+    static Component name(String name, TextColor color) {
+        return Component.text(name, color);
+    }
+
+    static String hearts(double health) {
+        return String.format(Locale.GERMAN, "%.1f", health / 2);
+    }
+
+    static String time(int seconds) {
+        return String.format("%d:%02d", seconds / 60, seconds % 60);
+    }
+
+    static void play(Player player, Sound sound, float pitch) {
+        player.playSound(player, sound, 1f, pitch);
+    }
+
+    static void play(Location location, Sound sound, float volume, float pitch) {
+        location.getWorld().playSound(location, sound, volume, pitch);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/Teams.java

@@ -0,0 +1,48 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.scoreboard.Scoreboard;
+import org.bukkit.scoreboard.Team;
+
+/**
+ * Scoreboard teams for the colored names. Players on a pad cannot be pushed (no collision),
+ * on the tribune and in a fight collision stays on.
+ */
+final class Teams {
+    private static final String[] NAMES = {"arena_pad_red", "arena_pad_blue", "arena_fight_red", "arena_fight_blue"};
+
+    private final Team[] teams = new Team[NAMES.length];
+
+    Teams() {
+        Scoreboard scoreboard = Bukkit.getScoreboardManager().getMainScoreboard();
+        for(int i = 0; i < NAMES.length; i++) {
+            Team team = scoreboard.getTeam(NAMES[i]);
+            if(team == null) team = scoreboard.registerNewTeam(NAMES[i]);
+            team.color(Style.PAD_TEXT_COLORS[i % 2]);
+            team.setOption(Team.Option.COLLISION_RULE, i < 2 ? Team.OptionStatus.NEVER : Team.OptionStatus.ALWAYS);
+            this.teams[i] = team;
+        }
+    }
+
+    static int pad(int pad) {
+        return pad;
+    }
+
+    static int fight(int side) {
+        return 2 + side;
+    }
+
+    void join(Player player, int team) {
+        this.leave(player);
+        this.teams[team].addEntry(player.getName());
+    }
+
+    void leave(Player player) {
+        for(Team team : this.teams) team.removeEntry(player.getName());
+    }
+
+    void clear() {
+        for(Team team : this.teams) team.getEntries().forEach(team::removeEntry);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/WorldProtectionListener.java

@@ -0,0 +1,145 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.Location;
+import org.bukkit.block.Block;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.block.BlockBreakEvent;
+import org.bukkit.event.block.BlockBurnEvent;
+import org.bukkit.event.block.BlockExplodeEvent;
+import org.bukkit.event.block.BlockFadeEvent;
+import org.bukkit.event.block.BlockFormEvent;
+import org.bukkit.event.block.BlockFromToEvent;
+import org.bukkit.event.block.BlockIgniteEvent;
+import org.bukkit.event.block.BlockPistonExtendEvent;
+import org.bukkit.event.block.BlockPistonRetractEvent;
+import org.bukkit.event.block.BlockPlaceEvent;
+import org.bukkit.event.block.BlockSpreadEvent;
+import org.bukkit.event.block.LeavesDecayEvent;
+import org.bukkit.event.entity.EntityChangeBlockEvent;
+import org.bukkit.event.entity.EntityExplodeEvent;
+import org.bukkit.event.hanging.HangingPlaceEvent;
+import org.bukkit.event.player.PlayerBucketEmptyEvent;
+import org.bukkit.event.player.PlayerBucketFillEvent;
+import org.bukkit.event.world.StructureGrowEvent;
+
+import java.util.List;
+
+/**
+ * In the play world blocks may only change inside the arenas. Everything else (tribune, pads, the space
+ * between arenas) stays exactly as in the template.
+ */
+class WorldProtectionListener extends ApplianceListener<Arena> {
+    private boolean isProtected(Block block) {
+        return this.isProtected(block.getLocation());
+    }
+
+    private boolean isProtected(Location location) {
+        if(!this.getAppliance().worlds().isPlay(location.getWorld())) return false;
+        return !this.getAppliance().isInsideArena(location);
+    }
+
+    private void cancelIfProtected(Block block, Cancellable event) {
+        if(this.isProtected(block)) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onPlace(BlockPlaceEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onBreak(BlockBreakEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onBucketEmpty(PlayerBucketEmptyEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onBucketFill(PlayerBucketFillEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onFlow(BlockFromToEvent event) {
+        this.cancelIfProtected(event.getToBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onSpread(BlockSpreadEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onForm(BlockFormEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onFade(BlockFadeEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onIgnite(BlockIgniteEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onBurn(BlockBurnEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onLeavesDecay(LeavesDecayEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onEntityChangeBlock(EntityChangeBlockEvent event) {
+        this.cancelIfProtected(event.getBlock(), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onHangingPlace(HangingPlaceEvent event) {
+        this.cancelIfProtected(event.getBlock().getRelative(event.getBlockFace()), event);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onGrow(StructureGrowEvent event) {
+        if(!this.getAppliance().worlds().isPlay(event.getWorld())) return;
+        event.getBlocks().removeIf(state -> this.isProtected(state.getLocation()));
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onPistonExtend(BlockPistonExtendEvent event) {
+        if(this.anyProtected(event.getBlock(), event.getBlocks(), event.getDirection().getModX(), event.getDirection().getModY(), event.getDirection().getModZ()))
+            event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onPistonRetract(BlockPistonRetractEvent event) {
+        if(this.anyProtected(event.getBlock(), event.getBlocks(), event.getDirection().getModX(), event.getDirection().getModY(), event.getDirection().getModZ()))
+            event.setCancelled(true);
+    }
+
+    private boolean anyProtected(Block piston, List<Block> moved, int dx, int dy, int dz) {
+        if(this.isProtected(piston) || this.isProtected(piston.getRelative(dx, dy, dz))) return true;
+        return moved.stream().anyMatch(block -> this.isProtected(block) || this.isProtected(block.getRelative(dx, dy, dz)));
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onEntityExplode(EntityExplodeEvent event) {
+        event.blockList().removeIf(this::isProtected);
+    }
+
+    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
+    public void onBlockExplode(BlockExplodeEvent event) {
+        event.blockList().removeIf(this::isProtected);
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/logic/FightMode.java

@@ -0,0 +1,25 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena.logic;
+
+/**
+ * Which inventory the fighters use. The challenger chooses it.
+ */
+public enum FightMode {
+    OWN,
+    CHALLENGER,
+    OPPONENT;
+
+    /**
+     * With more than one player on a side, "the opponent's inventory" would be ambiguous.
+     */
+    public boolean isAllowed(int ownSize, int opponentSize) {
+        return this != OPPONENT || (ownSize == 1 && opponentSize == 1);
+    }
+
+    public String displayName(boolean teams) {
+        return switch(this) {
+            case OWN -> "Jeder sein eigenes";
+            case CHALLENGER -> teams ? "Alle mit meinem" : "Beide mit meinem";
+            case OPPONENT -> "Beide mit dem des Gegners";
+        };
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/logic/PadLobby.java

@@ -0,0 +1,282 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena.logic;
+
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * State of the two start pads. The first player on a pad becomes the challenger and picks team sizes and mode.
+ * Everyone else joins a team by stepping on a pad. Once both pads hold exactly the chosen number of players
+ * and the challenger is done choosing (or took too long), the countdown runs and then the fight starts.
+ */
+public class PadLobby {
+    public static final int PADS = 2;
+    public static final int MAX_TEAM_SIZE = 4;
+
+    public interface Listener {
+        /** The player is now the challenger and may change the options until the countdown runs. */
+        void challengerSelected(UUID challenger, boolean first);
+
+        /** The player should now hold the inventory of {@code kitOwner} (the own one to revert). */
+        void kitAssigned(UUID player, UUID kitOwner);
+
+        /** Both pads are exactly full, but the challenger still has the options open. */
+        void waitingForChallenger();
+
+        /** Both pads are exactly full, the options are fixed now. */
+        void countdownStarted();
+
+        void countdown(int secondsLeft);
+
+        void countdownCancelled();
+
+        /**
+         * @param teams players per pad
+         * @param kits  whose inventory each player fights with
+         */
+        void start(List<List<UUID>> teams, UUID challenger, FightMode mode, Map<UUID, UUID> kits);
+    }
+
+    private final Listener listener;
+    private final int countdownTicks;
+    private final int choosingTicks;
+    private final List<List<UUID>> pads = List.of(new ArrayList<>(), new ArrayList<>());
+    /** Everyone on a pad, in the order they stepped on. The first one is the challenger. */
+    private final List<UUID> order = new ArrayList<>();
+    private final Map<UUID, UUID> kits = new HashMap<>();
+    private final int[] sizes = {1, 1};
+    private FightMode mode = FightMode.OWN;
+    private int ticksLeft = -1;
+    private boolean choosing;
+    /** How much longer everyone waits for the challenger to finish choosing; -1 while nobody waits. */
+    private int choosingTicksLeft = -1;
+
+    /**
+     * @param choosingSeconds how long a full lobby waits for the challenger to close the options
+     */
+    public PadLobby(Listener listener, int countdownSeconds, int choosingSeconds) {
+        this.listener = listener;
+        this.countdownTicks = countdownSeconds * 20;
+        this.choosingTicks = choosingSeconds * 20;
+    }
+
+    /**
+     * @return false if the pad is already full or the player stands on a pad
+     */
+    public boolean enter(int pad, UUID player) {
+        if(this.padOf(player) != -1) return false;
+        boolean first = this.order.isEmpty();
+        if(!first && this.pads.get(pad).size() >= this.sizes[pad]) return false;
+
+        this.pads.get(pad).add(player);
+        this.order.add(player);
+        this.kits.put(player, player);
+        if(first) {
+            this.sizes[0] = 1;
+            this.sizes[1] = 1;
+            this.mode = FightMode.OWN;
+            this.listener.challengerSelected(player, true);
+            return true;
+        }
+
+        this.refreshKits();
+        this.startCountdownIfReady();
+        return true;
+    }
+
+    public void leave(UUID player) {
+        int pad = this.padOf(player);
+        if(pad == -1) return;
+
+        boolean wasFull = this.isFull();
+        boolean wasChallenger = player.equals(this.challenger());
+        this.pads.get(pad).remove(player);
+        this.order.remove(player);
+        this.kits.remove(player);
+        this.listener.kitAssigned(player, player);
+
+        if(wasFull) {
+            if(this.isCountingDown()) this.listener.countdownCancelled();
+            this.ticksLeft = -1;
+            this.choosingTicksLeft = -1;
+        }
+        if(wasChallenger) this.choosing = false;
+
+        this.refreshKits();
+        // the longest waiting player takes over; team sizes and mode stay as chosen
+        if(wasChallenger && !this.order.isEmpty()) {
+            this.listener.challengerSelected(this.order.getFirst(), false);
+        }
+    }
+
+    public enum ConfigureResult {
+        OK,
+        NOT_ALLOWED,
+        OWN_TOO_SMALL,
+        OPPONENT_TOO_SMALL,
+        INVALID
+    }
+
+    /**
+     * Only the challenger can change the options, and only until the countdown runs.
+     * Teams cannot be smaller than the players already standing there.
+     *
+     * @param ownSize      players on the challenger's pad
+     * @param opponentSize players on the other pad
+     */
+    public ConfigureResult configure(UUID player, int ownSize, int opponentSize, FightMode mode) {
+        if(!this.canConfigure(player)) return ConfigureResult.NOT_ALLOWED;
+        if(ownSize < 1 || ownSize > MAX_TEAM_SIZE || opponentSize < 1 || opponentSize > MAX_TEAM_SIZE) return ConfigureResult.INVALID;
+        if(!mode.isAllowed(ownSize, opponentSize)) return ConfigureResult.INVALID;
+        int own = this.challengerPad();
+        if(ownSize < this.pads.get(own).size()) return ConfigureResult.OWN_TOO_SMALL;
+        if(opponentSize < this.pads.get(1 - own).size()) return ConfigureResult.OPPONENT_TOO_SMALL;
+
+        this.sizes[own] = ownSize;
+        this.sizes[1 - own] = opponentSize;
+        this.mode = mode;
+        this.refreshKits();
+        this.startCountdownIfReady();
+        return ConfigureResult.OK;
+    }
+
+    /**
+     * The challenger opened or closed the options. While they are open, a full lobby waits instead of counting down.
+     */
+    public void setChoosing(UUID player, boolean choosing) {
+        if(!this.canConfigure(player) || this.choosing == choosing) return;
+        this.choosing = choosing;
+        this.startCountdownIfReady();
+    }
+
+    public boolean isWaitingForChallenger() {
+        return this.choosingTicksLeft >= 0;
+    }
+
+    private void startCountdownIfReady() {
+        if(this.isCountingDown()) return;
+        if(!this.isFull()) {
+            this.choosingTicksLeft = -1;
+            return;
+        }
+        if(this.choosing) {
+            if(this.choosingTicksLeft >= 0) return;
+            this.choosingTicksLeft = this.choosingTicks;
+            this.listener.waitingForChallenger();
+            return;
+        }
+        this.choosingTicksLeft = -1;
+        this.ticksLeft = this.countdownTicks;
+        this.listener.countdownStarted();
+    }
+
+    public boolean canConfigure(UUID player) {
+        return player.equals(this.challenger()) && !this.isCountingDown();
+    }
+
+    /**
+     * Called every server tick. The countdown only runs while an arena is free.
+     */
+    public void tick(boolean arenaAvailable) {
+        if(this.choosingTicksLeft >= 0 && this.choosingTicksLeft-- == 0) {
+            this.choosing = false;
+            this.startCountdownIfReady();
+        }
+        if(this.ticksLeft < 0) return;
+        if(!arenaAvailable) {
+            this.ticksLeft = this.countdownTicks;
+            return;
+        }
+
+        if(this.ticksLeft % 20 == 0 && this.ticksLeft > 0) this.listener.countdown(this.ticksLeft / 20);
+        if(this.ticksLeft-- > 0) return;
+
+        List<List<UUID>> teams = List.of(List.copyOf(this.pads.get(0)), List.copyOf(this.pads.get(1)));
+        UUID challenger = this.challenger();
+        FightMode mode = this.mode;
+        Map<UUID, UUID> kits = Map.copyOf(this.kits);
+        this.pads.forEach(List::clear);
+        this.order.clear();
+        this.kits.clear();
+        this.sizes[0] = 1;
+        this.sizes[1] = 1;
+        this.mode = FightMode.OWN;
+        this.ticksLeft = -1;
+        this.choosing = false;
+        this.listener.start(teams, challenger, mode, kits);
+    }
+
+    /**
+     * Works out whose inventory everyone should hold and reports only the changes.
+     */
+    private void refreshKits() {
+        UUID challenger = this.challenger();
+        if(challenger == null) return;
+        int challengerPad = this.challengerPad();
+        UUID firstOpponent = this.pads.get(1 - challengerPad).isEmpty() ? null : this.pads.get(1 - challengerPad).getFirst();
+
+        for(UUID player : this.order) {
+            UUID wanted = switch(this.mode) {
+                case OWN -> player;
+                case CHALLENGER -> challenger;
+                case OPPONENT -> player.equals(challenger) && firstOpponent != null ? firstOpponent : player;
+            };
+            if(wanted.equals(this.kits.get(player))) continue;
+            this.kits.put(player, wanted);
+            this.listener.kitAssigned(player, wanted);
+        }
+    }
+
+    public int padOf(UUID player) {
+        for(int i = 0; i < PADS; i++) {
+            if(this.pads.get(i).contains(player)) return i;
+        }
+        return -1;
+    }
+
+    public List<UUID> players(int pad) {
+        return List.copyOf(this.pads.get(pad));
+    }
+
+    public int size(int pad) {
+        return this.sizes[pad];
+    }
+
+    public boolean isPadFull(int pad) {
+        return !this.order.isEmpty() && this.pads.get(pad).size() >= this.sizes[pad];
+    }
+
+    public @Nullable UUID challenger() {
+        return this.order.isEmpty() ? null : this.order.getFirst();
+    }
+
+    public int challengerPad() {
+        UUID challenger = this.challenger();
+        return challenger == null ? -1 : this.padOf(challenger);
+    }
+
+    public FightMode mode() {
+        return this.mode;
+    }
+
+    public boolean isFull() {
+        return this.pads.get(0).size() == this.sizes[0] && this.pads.get(1).size() == this.sizes[1];
+    }
+
+    public boolean isCountingDown() {
+        return this.ticksLeft >= 0;
+    }
+
+    public boolean isIdle() {
+        return this.order.isEmpty();
+    }
+
+    /** Seconds until the start, rounded up; -1 without countdown. */
+    public int secondsLeft() {
+        return this.ticksLeft < 0 ? -1 : (this.ticksLeft + 19) / 20;
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/logic/Region.java

@@ -0,0 +1,58 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena.logic;
+
+/**
+ * Axis-aligned box of whole blocks, both corners inclusive.
+ */
+public record Region(int minX, int minY, int minZ, int maxX, int maxY, int maxZ) {
+    public static Region of(int x1, int y1, int z1, int x2, int y2, int z2) {
+        return new Region(
+            Math.min(x1, x2), Math.min(y1, y2), Math.min(z1, z2),
+            Math.max(x1, x2), Math.max(y1, y2), Math.max(z1, z2)
+        );
+    }
+
+    public boolean contains(int x, int y, int z) {
+        return x >= this.minX && x <= this.maxX
+            && y >= this.minY && y <= this.maxY
+            && z >= this.minZ && z <= this.maxZ;
+    }
+
+    public boolean contains(double x, double y, double z) {
+        return this.contains((int) Math.floor(x), (int) Math.floor(y), (int) Math.floor(z));
+    }
+
+    public Region expand(int horizontal, int up) {
+        return new Region(
+            this.minX - horizontal, this.minY, this.minZ - horizontal,
+            this.maxX + horizontal, this.maxY + up, this.maxZ + horizontal
+        );
+    }
+
+    public long volume() {
+        return (long) (this.maxX - this.minX + 1) * (this.maxY - this.minY + 1) * (this.maxZ - this.minZ + 1);
+    }
+
+    public double centerX() {
+        return (this.minX + this.maxX + 1) / 2.0;
+    }
+
+    public double centerZ() {
+        return (this.minZ + this.maxZ + 1) / 2.0;
+    }
+
+    public int minChunkX() {
+        return this.minX >> 4;
+    }
+
+    public int maxChunkX() {
+        return this.maxX >> 4;
+    }
+
+    public int minChunkZ() {
+        return this.minZ >> 4;
+    }
+
+    public int maxChunkZ() {
+        return this.maxZ >> 4;
+    }
+}

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/logic/ResetCursor.java

@@ -0,0 +1,52 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena.logic;
+
+/**
+ * Walks through every block of a region in portions, so a reset can be spread over several ticks.
+ */
+public class ResetCursor {
+    @FunctionalInterface
+    public interface BlockVisitor {
+        void visit(int x, int y, int z);
+    }
+
+    private final Region region;
+    private int x;
+    private int y;
+    private int z;
+    private boolean done;
+
+    public ResetCursor(Region region) {
+        this.region = region;
+        this.x = region.minX();
+        this.y = region.minY();
+        this.z = region.minZ();
+    }
+
+    /**
+     * Visits up to {@code budget} blocks, continuing where the last call stopped.
+     *
+     * @return number of visited blocks
+     */
+    public int advance(int budget, BlockVisitor visitor) {
+        int visited = 0;
+        while(!this.done && visited < budget) {
+            visitor.visit(this.x, this.y, this.z);
+            visited++;
+            this.step();
+        }
+        return visited;
+    }
+
+    public boolean isDone() {
+        return this.done;
+    }
+
+    private void step() {
+        if(++this.y <= this.region.maxY()) return;
+        this.y = this.region.minY();
+        if(++this.z <= this.region.maxZ()) return;
+        this.z = this.region.minZ();
+        if(++this.x <= this.region.maxX()) return;
+        this.done = true;
+    }
+}

arena/src/test/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/logic/FightModeTest.java

@@ -0,0 +1,22 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena.logic;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class FightModeTest {
+    @Test
+    void opponentInventoryOnlyInOneVersusOne() {
+        assertTrue(FightMode.OPPONENT.isAllowed(1, 1));
+        assertFalse(FightMode.OPPONENT.isAllowed(1, 2));
+        assertFalse(FightMode.OPPONENT.isAllowed(3, 1));
+        assertTrue(FightMode.CHALLENGER.isAllowed(4, 3));
+        assertTrue(FightMode.OWN.isAllowed(2, 4));
+    }
+
+    @Test
+    void namesForTeams() {
+        assertEquals("Beide mit meinem", FightMode.CHALLENGER.displayName(false));
+        assertEquals("Alle mit meinem", FightMode.CHALLENGER.displayName(true));
+    }
+}

arena/src/test/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/logic/PadLobbyTest.java

@@ -0,0 +1,302 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena.logic;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PadLobbyTest {
+    private final UUID a = UUID.randomUUID();
+    private final UUID b = UUID.randomUUID();
+    private final UUID c = UUID.randomUUID();
+    private final UUID d = UUID.randomUUID();
+    private final UUID e = UUID.randomUUID();
+    private final List<String> events = new ArrayList<>();
+    private Map<UUID, UUID> startedKits;
+    private PadLobby lobby;
+
+    @BeforeEach
+    void setUp() {
+        this.lobby = new PadLobby(new PadLobby.Listener() {
+            public void challengerSelected(UUID challenger, boolean first) {
+                PadLobbyTest.this.events.add("challenger " + PadLobbyTest.this.name(challenger) + (first ? " first" : ""));
+            }
+
+            public void waitingForChallenger() {
+                PadLobbyTest.this.events.add("waiting");
+            }
+
+            public void countdownStarted() {
+                PadLobbyTest.this.events.add("countdown started");
+            }
+
+            public void kitAssigned(UUID player, UUID kitOwner) {
+                PadLobbyTest.this.events.add("kit " + PadLobbyTest.this.name(player) + "<-" + PadLobbyTest.this.name(kitOwner));
+            }
+
+            public void countdown(int secondsLeft) {
+                PadLobbyTest.this.events.add("countdown " + secondsLeft);
+            }
+
+            public void countdownCancelled() {
+                PadLobbyTest.this.events.add("cancelled");
+            }
+
+            public void start(List<List<UUID>> teams, UUID challenger, FightMode mode, Map<UUID, UUID> kits) {
+                PadLobbyTest.this.startedKits = kits;
+                PadLobbyTest.this.events.add("start " + PadLobbyTest.this.names(teams.get(0)) + " vs " + PadLobbyTest.this.names(teams.get(1))
+                    + " by " + PadLobbyTest.this.name(challenger) + " " + mode);
+            }
+        }, 2, 3);
+    }
+
+    private String name(UUID uuid) {
+        if(uuid.equals(this.a)) return "a";
+        if(uuid.equals(this.b)) return "b";
+        if(uuid.equals(this.c)) return "c";
+        if(uuid.equals(this.d)) return "d";
+        return "e";
+    }
+
+    private String names(List<UUID> uuids) {
+        return uuids.stream().map(this::name).collect(Collectors.joining());
+    }
+
+    private void run(int ticks) {
+        for(int i = 0; i < ticks; i++) this.lobby.tick(true);
+    }
+
+    @Test
+    void firstOnPadBecomesChallengerAndMayConfigure() {
+        assertTrue(this.lobby.enter(1, this.a));
+        assertEquals(List.of("challenger a first"), this.events);
+        assertEquals(this.a, this.lobby.challenger());
+        assertTrue(this.lobby.canConfigure(this.a));
+        assertFalse(this.lobby.isCountingDown());
+    }
+
+    @Test
+    void oneVersusOneStartsAfterCountdown() {
+        this.lobby.enter(0, this.a);
+        assertEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 1, 1, FightMode.CHALLENGER));
+        this.lobby.enter(1, this.b);
+        assertEquals(PadLobby.ConfigureResult.NOT_ALLOWED, this.lobby.configure(this.a, 1, 1, FightMode.OWN), "options are fixed during the countdown");
+        this.run(41);
+
+        assertEquals(List.of(
+            "challenger a first",
+            "kit b<-a",
+            "countdown started",
+            "countdown 2",
+            "countdown 1",
+            "start a vs b by a CHALLENGER"
+        ), this.events);
+        assertEquals(Map.of(this.a, this.a, this.b, this.a), this.startedKits);
+        assertTrue(this.lobby.isIdle());
+    }
+
+    @Test
+    void fullPadIsRefusedAndPlayerOnlyTakesOnePad() {
+        this.lobby.enter(0, this.a);
+        this.lobby.enter(1, this.b);
+        assertFalse(this.lobby.enter(1, this.c), "1v1: the blue pad is full");
+        assertFalse(this.lobby.enter(0, this.b), "a player can only stand on one pad");
+    }
+
+    @Test
+    void unevenTeamsStartWhenBothPadsAreExactlyFull() {
+        this.lobby.enter(0, this.a);
+        assertEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 2, 3, FightMode.OWN));
+        assertTrue(this.lobby.enter(0, this.b));
+        assertFalse(this.lobby.enter(0, this.c), "red is full with 2");
+        this.lobby.enter(1, this.c);
+        this.lobby.enter(1, this.d);
+        assertFalse(this.lobby.isCountingDown());
+        this.lobby.enter(1, this.e);
+        assertTrue(this.lobby.isCountingDown());
+        this.run(41);
+        assertEquals("start ab vs cde by a OWN", this.events.getLast());
+    }
+
+    @Test
+    void challengerKitGoesToEveryone() {
+        this.lobby.enter(0, this.a);
+        this.lobby.configure(this.a, 2, 2, FightMode.CHALLENGER);
+        this.lobby.enter(0, this.b);
+        this.lobby.enter(1, this.c);
+        this.lobby.enter(1, this.d);
+        assertEquals(List.of("challenger a first", "kit b<-a", "kit c<-a", "kit d<-a", "countdown started"), this.events);
+    }
+
+    @Test
+    void opponentModeOnlyForOneVersusOne() {
+        this.lobby.enter(0, this.a);
+        assertNotEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 2, 1, FightMode.OPPONENT));
+        assertEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 1, 1, FightMode.OPPONENT));
+        this.lobby.enter(1, this.b);
+        assertTrue(this.events.contains("kit a<-b"));
+
+        this.lobby.leave(this.b);
+        assertTrue(this.events.contains("kit a<-a"), "challenger gets the own inventory back");
+        assertTrue(this.events.contains("cancelled"));
+    }
+
+    @Test
+    void onlyChallengerMayConfigure() {
+        this.lobby.enter(0, this.a);
+        assertNotEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.b, 2, 2, FightMode.OWN));
+        assertNotEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 5, 1, FightMode.OWN));
+        assertNotEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 0, 1, FightMode.OWN));
+    }
+
+    @Test
+    void countdownWaitsForFreeArena() {
+        this.lobby.enter(0, this.a);
+        this.lobby.enter(1, this.b);
+        for(int i = 0; i < 100; i++) this.lobby.tick(false);
+        assertFalse(this.events.contains("countdown 2"));
+        assertEquals(2, this.lobby.secondsLeft());
+        this.run(41);
+        assertEquals("start a vs b by a OWN", this.events.getLast());
+    }
+
+    @Test
+    void leavingCancelsCountdownAndRevertsKit() {
+        this.lobby.enter(0, this.a);
+        this.lobby.configure(this.a, 1, 1, FightMode.CHALLENGER);
+        this.lobby.enter(1, this.b);
+        this.events.clear();
+
+        this.lobby.leave(this.b);
+
+        assertEquals(List.of("kit b<-b", "cancelled"), this.events);
+        assertEquals(this.a, this.lobby.challenger());
+        assertEquals(FightMode.CHALLENGER, this.lobby.mode());
+        assertFalse(this.lobby.isCountingDown());
+    }
+
+    @Test
+    void longestWaitingTakesOverAndKeepsTeamSizes() {
+        this.lobby.enter(0, this.a);
+        this.lobby.configure(this.a, 2, 2, FightMode.CHALLENGER);
+        this.lobby.enter(1, this.b);
+        this.lobby.enter(0, this.c);
+        this.events.clear();
+
+        this.lobby.leave(this.a);
+
+        assertEquals(List.of("kit a<-a", "kit b<-b", "kit c<-b", "challenger b"), this.events);
+        assertEquals(this.b, this.lobby.challenger());
+        assertTrue(this.lobby.canConfigure(this.b), "the new challenger may change the options");
+        assertEquals(2, this.lobby.size(0));
+        assertEquals(2, this.lobby.size(1));
+    }
+
+    @Test
+    void handOverWhenAlone() {
+        this.lobby.enter(0, this.a);
+        this.lobby.enter(1, this.b);
+        this.lobby.leave(this.a);
+        assertEquals("challenger b", this.events.getLast());
+        assertTrue(this.lobby.canConfigure(this.b));
+    }
+
+    @Test
+    void challengerMayChangeOptionsWhileOthersWait() {
+        this.lobby.enter(0, this.a);
+        this.lobby.configure(this.a, 2, 2, FightMode.OWN);
+        this.lobby.enter(0, this.b);
+        this.lobby.enter(1, this.c);
+
+        assertEquals(PadLobby.ConfigureResult.OWN_TOO_SMALL, this.lobby.configure(this.a, 1, 2, FightMode.OWN),
+            "two already stand on the own pad");
+        assertEquals(2, this.lobby.size(0));
+
+        this.events.clear();
+        assertEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 2, 1, FightMode.CHALLENGER));
+        assertEquals(List.of("kit b<-a", "kit c<-a", "countdown started"), this.events, "shrinking to the players there starts the countdown");
+        assertTrue(this.lobby.isCountingDown());
+    }
+
+    @Test
+    void opponentSideCannotShrinkBelowPlayers() {
+        this.lobby.enter(0, this.a);
+        this.lobby.configure(this.a, 1, 3, FightMode.OWN);
+        this.lobby.enter(1, this.b);
+        this.lobby.enter(1, this.c);
+        assertEquals(PadLobby.ConfigureResult.OPPONENT_TOO_SMALL, this.lobby.configure(this.a, 1, 1, FightMode.OWN));
+        assertEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 1, 4, FightMode.OWN));
+    }
+
+    @Test
+    void lastPlayerLeavingResetsLobby() {
+        this.lobby.enter(0, this.a);
+        this.lobby.leave(this.a);
+        assertTrue(this.lobby.isIdle());
+        assertNull(this.lobby.challenger());
+        this.lobby.leave(this.b);
+        assertEquals(List.of("challenger a first", "kit a<-a"), this.events);
+    }
+
+    @Test
+    void fullLobbyWaitsWhileChallengerChooses() {
+        this.lobby.enter(0, this.a);
+        this.lobby.setChoosing(this.a, true);
+        this.lobby.enter(1, this.b);
+        assertEquals("waiting", this.events.getLast());
+        assertFalse(this.lobby.isCountingDown());
+        assertTrue(this.lobby.isWaitingForChallenger());
+        assertEquals(PadLobby.ConfigureResult.OK, this.lobby.configure(this.a, 1, 1, FightMode.CHALLENGER), "the menu stays usable");
+
+        this.lobby.setChoosing(this.a, false);
+        assertEquals("countdown started", this.events.getLast());
+        assertFalse(this.lobby.isWaitingForChallenger());
+    }
+
+    @Test
+    void choosingTimesOut() {
+        this.lobby.enter(0, this.a);
+        this.lobby.setChoosing(this.a, true);
+        this.lobby.enter(1, this.b);
+        this.run(60);
+        assertFalse(this.lobby.isCountingDown());
+        this.run(1);
+        assertTrue(this.lobby.isCountingDown());
+        this.lobby.setChoosing(this.a, false);
+        assertEquals(1, this.events.stream().filter("countdown started"::equals).count());
+    }
+
+    @Test
+    void onlyChallengerChoosingBlocks() {
+        this.lobby.enter(0, this.a);
+        this.lobby.setChoosing(this.b, true);
+        this.lobby.enter(1, this.b);
+        assertTrue(this.lobby.isCountingDown());
+    }
+
+    @Test
+    void opponentLeavingWhileWaitingIsQuiet() {
+        this.lobby.enter(0, this.a);
+        this.lobby.setChoosing(this.a, true);
+        this.lobby.enter(1, this.b);
+        this.lobby.leave(this.b);
+        assertFalse(this.events.contains("cancelled"));
+        assertFalse(this.lobby.isWaitingForChallenger());
+    }
+
+    @Test
+    void newChallengerIsNotChoosing() {
+        this.lobby.enter(0, this.a);
+        this.lobby.setChoosing(this.a, true);
+        this.lobby.enter(1, this.b);
+        this.lobby.leave(this.a);
+        this.lobby.enter(0, this.c);
+        assertTrue(this.lobby.isCountingDown());
+    }
+}

arena/src/test/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/logic/RegionTest.java

@@ -0,0 +1,52 @@
+package eu.mhsl.craftattack.spawn.arena.appliances.arena.logic;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class RegionTest {
+    @Test
+    void cornersAreNormalized() {
+        assertEquals(new Region(-2, 1, -5, 3, 4, 6), Region.of(3, 4, -5, -2, 1, 6));
+    }
+
+    @Test
+    void containsIsInclusiveAndFloorsNegativeCoordinates() {
+        Region region = Region.of(-2, 0, -2, 1, 3, 1);
+        assertTrue(region.contains(-2, 0, -2));
+        assertTrue(region.contains(1, 3, 1));
+        assertFalse(region.contains(2, 0, 0));
+        assertTrue(region.contains(-1.5, 0.0, 1.99));
+        assertFalse(region.contains(-2.01, 0.0, 0.0));
+        assertFalse(region.contains(1.0, 4.0, 0.0));
+    }
+
+    @Test
+    void volumeAndChunks() {
+        Region region = Region.of(-1, 0, 15, 16, 9, 32);
+        assertEquals(18L * 10 * 18, region.volume());
+        assertEquals(-1, region.minChunkX());
+        assertEquals(1, region.maxChunkX());
+        assertEquals(0, region.minChunkZ());
+        assertEquals(2, region.maxChunkZ());
+    }
+
+    @Test
+    void resetCursorVisitsEveryBlockOnceInPortions() {
+        Region region = Region.of(0, 0, 0, 4, 3, 2);
+        ResetCursor cursor = new ResetCursor(region);
+        Set<String> visited = new HashSet<>();
+        int calls = 0;
+        while(!cursor.isDone()) {
+            int count = cursor.advance(7, (x, y, z) -> assertTrue(visited.add(x + "," + y + "," + z)));
+            assertTrue(count <= 7);
+            calls++;
+        }
+        assertEquals(region.volume(), visited.size());
+        assertEquals((int) Math.ceil(region.volume() / 7.0), calls);
+        assertEquals(0, cursor.advance(7, (x, y, z) -> fail()));
+    }
+}

build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'com.gradleup.shadow' version "8.3.5"
+    id 'com.gradleup.shadow' version "9.6.1"
 }
 
 allprojects {
@@ -29,7 +29,7 @@ subprojects {
 
     java {
         toolchain {
-            languageVersion = JavaLanguageVersion.of(21)
+            languageVersion = JavaLanguageVersion.of(25)
         }
     }
 }

common/build.gradle

@@ -1,7 +1,7 @@
 dependencies {
     implementation project(':core')
 
-    compileOnly 'io.papermc.paper:paper-api:1.21.8-R0.1-SNAPSHOT'
+    compileOnly 'io.papermc.paper:paper-api:26.2.build.129-stable'
     compileOnly 'org.geysermc.floodgate:api:2.2.4-SNAPSHOT'
     implementation 'org.apache.httpcomponents:httpclient:4.5.14'
     implementation 'com.sparkjava:spark-core:2.9.4'

common/src/main/java/eu/mhsl/craftattack/spawn/common/api/repositories/CraftAttackReportRepository.java

@@ -11,17 +11,20 @@ public class CraftAttackReportRepository extends ReportRepository {
 
     public ReqResp<PlayerReports> queryReports(UUID player) {
         return this.get(
-            "report",
-            (parameters) -> parameters.addParameter("uuid", player.toString()),
+            "users/%s/reports".formatted(player.toString()),
             PlayerReports.class
         );
     }
 
     public ReqResp<ReportUrl> createReport(ReportCreationInfo data) {
         return this.post(
-            "report",
+            "reports",
             data,
             ReportUrl.class
         );
     }
+
+    public ReqResp<AllReports> queryAllReports() {
+        return this.get("reports", AllReports.class);
+    }
 }

common/src/main/java/eu/mhsl/craftattack/spawn/common/api/repositories/ReportRepository.java

@@ -21,22 +21,32 @@ public abstract class ReportRepository extends HttpRepository {
     public record ReportUrl(@NotNull String url) {
     }
 
+    public enum Status {
+        open,
+        closed,
+    }
+
     public record PlayerReports(
         List<Report> from_self,
-        Object to_self
+        List<Report> to_self
     ) {
         public record Report(
-            @Nullable Reporter reported,
-            @NotNull String subject,
-            boolean draft,
-            @NotNull String status,
+            @Nullable UUID reported,
+            @NotNull String reason,
+            @Nullable Long created,
+            @Nullable Status status,
             @NotNull String url
-        ) {
-            public record Reporter(
-                @NotNull String username,
-                @NotNull String uuid
-            ) {
-            }
-        }
+        ) { }
+    }
+
+    public record AllReports(List<Report> reports) {
+        public record Report(
+            @NotNull UUID reporter,
+            @Nullable UUID reported,
+            @NotNull String reason,
+            @Nullable Long created,
+            @Nullable Status status,
+            @NotNull String url
+        ) { }
     }
 }

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/adminMarker/AdminMarker.java

@@ -14,7 +14,7 @@ import org.jetbrains.annotations.Nullable;
 import java.util.UUID;
 
 public class AdminMarker extends Appliance implements DisplayName.Colored {
-    public final static String adminPermission = "admin";
+    public final static String adminPermission = "adminmarker";
 
     @Override
     public @Nullable TextColor getNameColor(Player player) {

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/chatMention/ChatMention.java

@@ -1,66 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.chatMention;
-
-import eu.mhsl.craftattack.spawn.core.Main;
-import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.Settings;
-import net.kyori.adventure.sound.Sound;
-import org.bukkit.Bukkit;
-import org.bukkit.OfflinePlayer;
-import org.bukkit.event.Listener;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.Arrays;
-import java.util.List;
-import java.util.Objects;
-
-public class ChatMention extends Appliance {
-    private static List<String> playerNames;
-
-    public String formatPlayer(String name) {
-        return "@" + name;
-    }
-
-    public List<String> getPlayerNames() {
-        return playerNames;
-    }
-
-    public void refreshPlayers() {
-        Bukkit.getScheduler().runTaskAsynchronously(
-            Main.instance(),
-            () -> playerNames = Arrays.stream(Bukkit.getOfflinePlayers())
-                .map(OfflinePlayer::getName)
-                .filter(Objects::nonNull)
-                .toList()
-        );
-    }
-
-    public void notifyPlayers(List<String> playerNames) {
-        playerNames.stream()
-            .distinct()
-            .map(Bukkit::getPlayer)
-            .filter(Objects::nonNull)
-            .filter(player -> Settings.instance()
-                .getSetting(player, Settings.Key.ChatMentions, ChatMentionSetting.ChatMentionConfig.class)
-                .notifyOnMention()
-            )
-            .forEach(player -> player.playSound(
-                Sound.sound(
-                    org.bukkit.Sound.ENTITY_EXPERIENCE_ORB_PICKUP,
-                    Sound.Source.PLAYER,
-                    1.0f,
-                    1.0f
-                )
-            ));
-    }
-
-    @Override
-    public void onEnable() {
-        Settings.instance().declareSetting(ChatMentionSetting.class);
-        this.refreshPlayers();
-    }
-
-    @Override
-    protected @NotNull List<Listener> listeners() {
-        return List.of(new ChatMentionListener());
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/chatMention/ChatMentionListener.java

@@ -1,56 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.chatMention;
-
-import eu.mhsl.craftattack.spawn.core.Main;
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.chatMessages.ChatMessages;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.Settings;
-import eu.mhsl.craftattack.spawn.core.util.text.ComponentUtil;
-import io.papermc.paper.event.player.AsyncChatDecorateEvent;
-import net.kyori.adventure.text.Component;
-import net.kyori.adventure.text.format.NamedTextColor;
-import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
-import org.bukkit.event.EventHandler;
-import org.bukkit.event.player.PlayerJoinEvent;
-
-import java.util.ArrayList;
-import java.util.List;
-
-class ChatMentionListener extends ApplianceListener<ChatMention> {
-    @SuppressWarnings("UnstableApiUsage")
-    @EventHandler
-    public void coloringEvent(AsyncChatDecorateEvent event) {
-        String message = PlainTextComponentSerializer.plainText().serialize(event.result());
-        List<String> words = List.of(message.split(" "));
-        List<String> mentioned = new ArrayList<>();
-
-        ChatMentionSetting.ChatMentionConfig config = Settings.instance()
-            .getSetting(event.player(), Settings.Key.ChatMentions, ChatMentionSetting.ChatMentionConfig.class);
-        ChatMessages chatMessages = Main.instance().getAppliance(ChatMessages.class);
-
-        Component result = words.stream()
-            .map(word -> {
-                String wordWithoutAnnotation = word.replace("@", "");
-                boolean isPlayer = this.getAppliance().getPlayerNames().contains(wordWithoutAnnotation);
-                if(isPlayer && config.applyMentions()) {
-                    mentioned.add(wordWithoutAnnotation);
-                    Component mention = Component.text(
-                        this.getAppliance().formatPlayer(wordWithoutAnnotation),
-                        NamedTextColor.GOLD
-                    );
-                    return chatMessages.addReportActions(mention, wordWithoutAnnotation);
-                } else {
-                    return Component.text(word);
-                }
-            })
-            .reduce(ComponentUtil::appendWithSpace)
-            .orElseThrow();
-
-        this.getAppliance().notifyPlayers(mentioned);
-        event.result(result);
-    }
-
-    @EventHandler
-    public void onJoin(PlayerJoinEvent event) {
-        this.getAppliance().refreshPlayers();
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/chatMessages/ChatMessages.java

@@ -1,36 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.chatMessages;
-
-import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.Settings;
-import net.kyori.adventure.text.Component;
-import net.kyori.adventure.text.event.ClickEvent;
-import net.kyori.adventure.text.event.HoverEvent;
-import net.kyori.adventure.text.format.NamedTextColor;
-import org.bukkit.entity.Player;
-import org.bukkit.event.Listener;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.List;
-
-public class ChatMessages extends Appliance {
-    @Override
-    public void onEnable() {
-        Settings.instance().declareSetting(ShowJoinAndLeaveMessagesSetting.class);
-    }
-
-    public Component getReportablePlayerName(Player player) {
-        return this.addReportActions(player.displayName(), player.getName());
-    }
-
-    public Component addReportActions(Component message, String username) {
-        return message
-            .hoverEvent(HoverEvent.showText(Component.text("Klicke, um diesen Spieler zu reporten").color(NamedTextColor.GOLD)))
-            .clickEvent(ClickEvent.clickEvent(ClickEvent.Action.SUGGEST_COMMAND, String.format("/report %s ", username)));
-    }
-
-    @Override
-    @NotNull
-    protected List<Listener> listeners() {
-        return List.of(new ChatMessagesListener());
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/chatMessages/ChatMessagesListener.java

@@ -1,74 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.chatMessages;
-
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.Settings;
-import eu.mhsl.craftattack.spawn.core.util.IteratorUtil;
-import io.papermc.paper.event.player.AsyncChatEvent;
-import net.kyori.adventure.text.Component;
-import net.kyori.adventure.text.format.NamedTextColor;
-import net.kyori.adventure.text.format.TextColor;
-import org.bukkit.Color;
-import org.bukkit.event.EventHandler;
-import org.bukkit.event.EventPriority;
-import org.bukkit.event.entity.PlayerDeathEvent;
-import org.bukkit.event.player.PlayerJoinEvent;
-import org.bukkit.event.player.PlayerQuitEvent;
-
-import java.util.Optional;
-
-class ChatMessagesListener extends ApplianceListener<ChatMessages> {
-    @EventHandler
-    public void onPlayerChatEvent(AsyncChatEvent event) {
-        event.renderer(
-            (source, sourceDisplayName, message, viewer) ->
-                Component.text("")
-                    .append(this.getAppliance().getReportablePlayerName(source))
-                    .append(Component.text(" > ").color(TextColor.color(Color.GRAY.asRGB())))
-                    .append(message).color(TextColor.color(Color.SILVER.asRGB()))
-        );
-    }
-
-    @EventHandler(priority = EventPriority.HIGH)
-    public void onPlayerJoin(PlayerJoinEvent event) {
-        boolean wasHidden = event.joinMessage() == null;
-        event.joinMessage(null);
-        if(wasHidden) return;
-        IteratorUtil.onlinePlayers(player -> {
-            if(!Settings.instance().getSetting(player, Settings.Key.ShowJoinAndLeaveMessages, Boolean.class)) return;
-            player.sendMessage(
-                Component
-                    .text(">>> ").color(NamedTextColor.GREEN)
-                    .append(this.getAppliance().getReportablePlayerName(event.getPlayer()))
-            );
-        });
-    }
-
-    @EventHandler
-    public void onPlayerLeave(PlayerQuitEvent event) {
-        boolean wasHidden = event.quitMessage() == null;
-        event.quitMessage(null);
-        if(wasHidden) return;
-        IteratorUtil.onlinePlayers(player -> {
-            if(!Settings.instance().getSetting(player, Settings.Key.ShowJoinAndLeaveMessages, Boolean.class)) return;
-            player.sendMessage(
-                Component
-                    .text("<<< ").color(NamedTextColor.RED)
-                    .append(this.getAppliance().getReportablePlayerName(event.getPlayer()))
-            );
-        });
-    }
-
-    @EventHandler
-    public void onDeath(PlayerDeathEvent event) {
-        event.deathMessage(
-            Component
-                .text("☠ ")
-                .append(
-                    Optional
-                        .ofNullable(event.deathMessage())
-                        .orElse(Component.text(event.getPlayer().getName()))
-                )
-                .color(TextColor.color(Color.SILVER.asRGB()))
-        );
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/displayName/DisplayName.java

@@ -2,10 +2,12 @@ package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.displayName;
 
 import eu.mhsl.craftattack.spawn.core.Main;
 import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.networkChat.NetworkChat;
 import eu.mhsl.craftattack.spawn.core.util.server.Floodgate;
 import eu.mhsl.craftattack.spawn.core.util.text.ComponentUtil;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.ComponentBuilder;
+import net.kyori.adventure.text.JoinConfiguration;
 import net.kyori.adventure.text.TextComponent;
 import net.kyori.adventure.text.event.HoverEvent;
 import net.kyori.adventure.text.format.NamedTextColor;
@@ -49,15 +51,27 @@ public class DisplayName extends Appliance {
             .map(appliance -> (Prefixed) appliance)
             .toList();
 
-        ComponentBuilder<TextComponent, TextComponent.Builder> playerName = Component.text();
-        prefixes.stream()
+        List<Component> prefixComponents = prefixes.stream()
             .map(prefixed -> prefixed.getNamePrefix(player))
             .filter(Objects::nonNull)
-            .forEach(prefix -> playerName
-                .append(prefix)
-                .append(ComponentUtil.clearedSpace())
+            .toList();
+
+        ComponentBuilder<TextComponent, TextComponent.Builder> playerName = Component.text();
+        prefixComponents.forEach(prefix -> playerName
+            .append(prefix)
+            .append(ComponentUtil.clearedSpace())
         );
 
+        // Den Chat-Namen baut Velocity selbst (Farbe, Bedrock), es braucht von hier nur die Prefixe
+        Main.instance().getAppliances().stream()
+            .filter(NetworkChat.class::isInstance)
+            .map(NetworkChat.class::cast)
+            .findFirst()
+            .ifPresent(networkChat -> networkChat.setPrefix(
+                player,
+                prefixComponents.isEmpty() ? null : Component.join(JoinConfiguration.separator(ComponentUtil.clearedSpace()), prefixComponents)
+            ));
+
         if(Floodgate.isBedrock(player)) {
             playerName
                 .append(

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/help/command/HelpCommand.java

@@ -19,7 +19,7 @@ public class HelpCommand extends ApplianceCommand<Help> {
             Component.text("Willkommen auf Craftattack!", NamedTextColor.GOLD)
                 .appendNewline()
                 .append(Component.text("Wenn du hilfe benötigst kannst du dich jederzeit an einen Admin wenden." +
-                    " Weitere Informationen zu Funktionen und Befehlen erhältst du zudem im Turm am Spawn.", NamedTextColor.GRAY))
+                    " Weitere Informationen zu Funktionen und Befehlen erhältst du zudem am Spawn.", NamedTextColor.GRAY))
         );
     }
 }

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/infoBars/InfoBarSetting.java

@@ -19,7 +19,8 @@ public class InfoBarSetting extends MultiBoolSetting<InfoBarSetting.InfoBarConfi
     public record InfoBarConfiguration(
         @DisplayName("Millisekunden pro Tick") boolean mspt,
         @DisplayName("Spieler online") boolean playerCounter,
-        @DisplayName("Ticks pro Sekunde") boolean tps
+        @DisplayName("Ticks pro Sekunde") boolean tps,
+        @DisplayName("TPS, MSPT & Spieler") boolean tpsMsptPlayerCounter
     ) {}
 
     @Override
@@ -39,13 +40,11 @@ public class InfoBarSetting extends MultiBoolSetting<InfoBarSetting.InfoBarConfi
 
     @Override
     protected InfoBarConfiguration defaultValue() {
-        return new InfoBarConfiguration(false, false, false);
+        return new InfoBarConfiguration(false, false, false, false);
     }
 
     @Override
     public Class<?> dataType() {
         return InfoBarConfiguration.class;
     }
-
-
 }

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/infoBars/InfoBars.java

@@ -1,67 +1,41 @@
 package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.infoBars;
 
+import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.infoBars.bars.TpsMsptPlayerCounterBar;
 import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.Settings;
-import eu.mhsl.craftattack.spawn.core.Main;
 import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
 import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
 import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.infoBars.bars.MsptBar;
 import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.infoBars.bars.PlayerCounterBar;
 import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.infoBars.bars.TpsBar;
-import org.bukkit.Bukkit;
-import org.bukkit.NamespacedKey;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Listener;
-import org.bukkit.persistence.PersistentDataContainer;
-import org.bukkit.persistence.PersistentDataType;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.ArrayList;
 import java.util.List;
 
 public class InfoBars extends Appliance {
-    private final NamespacedKey infoBarKey = new NamespacedKey(Main.instance(), "infobars");
     private final List<Bar> infoBars = List.of(
         new TpsBar(),
         new MsptBar(),
-        new PlayerCounterBar()
+        new PlayerCounterBar(),
+        new TpsMsptPlayerCounterBar()
     );
 
     public void showAllEnabled(Player player) {
-        this.getEnabledBars(player).forEach(bar -> this.show(player, bar));
+        InfoBarSetting.InfoBarConfiguration config = Settings.instance().getSetting(player, Settings.Key.InfoBars, InfoBarSetting.InfoBarConfiguration.class);
+        this.setVisible(player, MsptBar.name, config.mspt());
+        this.setVisible(player, PlayerCounterBar.name, config.playerCounter());
+        this.setVisible(player, TpsBar.name, config.tps());
+        this.setVisible(player, TpsMsptPlayerCounterBar.name, config.tpsMsptPlayerCounter());
     }
 
-    public void hideAllEnabled(Player player) {
-        this.getEnabledBars(player).forEach(bar -> this.hide(player, bar));
-        this.setEnabledBars(player, List.of());
-    }
-
-    public void show(Player player, String bar) {
+    public void setVisible(Player player, String bar, boolean visible) {
         this.validateBarName(bar);
-        List<String> existingBars = new ArrayList<>(this.getEnabledBars(player));
-        existingBars.add(bar);
-        player.showBossBar(this.getBarByName(bar).getBossBar());
-        this.setEnabledBars(player, existingBars);
-    }
-
-    public void hide(Player player, String bar) {
-        this.validateBarName(bar);
-        List<String> existingBars = new ArrayList<>(this.getEnabledBars(player));
-        existingBars.remove(bar);
-        player.hideBossBar(this.getBarByName(bar).getBossBar());
-        this.setEnabledBars(player, existingBars);
-    }
-
-    private List<String> getEnabledBars(Player player) {
-        PersistentDataContainer container = player.getPersistentDataContainer();
-        if(!container.has(this.infoBarKey)) return List.of();
-        return container.get(this.infoBarKey, PersistentDataType.LIST.strings());
-    }
-
-    private void setEnabledBars(Player player, List<String> bars) {
-        Bukkit.getScheduler().runTask(
-            Main.instance(),
-            () -> player.getPersistentDataContainer().set(this.infoBarKey, PersistentDataType.LIST.strings(), bars)
-        );
+        if(visible) {
+            player.showBossBar(this.getBarByName(bar).getBossBar());
+        } else {
+            player.hideBossBar(this.getBarByName(bar).getBossBar());
+        }
     }
 
     private Bar getBarByName(String name) {
@@ -79,13 +53,7 @@ public class InfoBars extends Appliance {
     @Override
     public void onEnable() {
         Settings.instance().declareSetting(InfoBarSetting.class);
-        Settings.instance().addChangeListener(InfoBarSetting.class, player -> {
-            this.hideAllEnabled(player);
-            InfoBarSetting.InfoBarConfiguration config = Settings.instance().getSetting(player, Settings.Key.InfoBars, InfoBarSetting.InfoBarConfiguration.class);
-            if(config.mspt()) this.show(player, MsptBar.name);
-            if(config.playerCounter()) this.show(player, PlayerCounterBar.name);
-            if(config.tps()) this.show(player, TpsBar.name);
-        });
+        Settings.instance().addChangeListener(InfoBarSetting.class, this::showAllEnabled);
     }
 
     @Override

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/infoBars/bars/TpsMsptPlayerCounterBar.java

@@ -0,0 +1,103 @@
+package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.infoBars.bars;
+
+import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.infoBars.Bar;
+import eu.mhsl.craftattack.spawn.common.appliances.tooling.playerlimit.PlayerLimit;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.util.statistics.ServerMonitor;
+import eu.mhsl.craftattack.spawn.core.util.text.ColorUtil;
+import net.kyori.adventure.bossbar.BossBar;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.text.format.TextColor;
+import org.bukkit.Bukkit;
+
+import java.time.Duration;
+
+public class TpsMsptPlayerCounterBar extends Bar {
+    public static String name = "serverStats";
+
+    @Override
+    protected Duration refresh() {
+        return Duration.ofSeconds(3);
+    }
+
+    @Override
+    protected String name() {
+        return name;
+    }
+
+    @Override
+    protected Component title() {
+        float tps = this.currentTps();
+        float mspt = this.currentMspt();
+        int players = this.currentPlayerCount();
+
+        Component separator = Component.text(" | ", NamedTextColor.DARK_GRAY);
+        TextColor color = ColorUtil.mapGreenToRed(players, 0, this.getMaxPlayerCount(), true);
+
+        return Component.text()
+                .append(Component.text("TPS: ", NamedTextColor.GRAY))
+                .append(Component.text(String.format("%.2f", tps), ColorUtil.tpsColor(tps)))
+                .append(separator)
+                .append(Component.text("MSPT: ", NamedTextColor.GRAY))
+                .append(Component.text(String.format("%.2f", mspt), ColorUtil.msptColor(mspt)))
+                .append(separator)
+                .append(Component.text("Spieler: ", NamedTextColor.GRAY))
+                .append(Component.text(players, color))
+                .build();
+    }
+
+    @Override
+    protected float progress() {
+        return Math.clamp(this.currentTps() / 20f, 0f, 1f);
+    }
+
+    @Override
+    protected BossBar.Color color() {
+        int severity = Math.max(
+                this.tpsSeverity(),
+                Math.max(this.msptSeverity(), this.playerSeverity())
+        );
+
+        return switch (severity) {
+            case 2 -> BossBar.Color.RED;
+            case 1 -> BossBar.Color.YELLOW;
+            default -> BossBar.Color.GREEN;
+        };
+    }
+
+    @Override
+    protected BossBar.Overlay overlay() {
+        return BossBar.Overlay.PROGRESS;
+    }
+
+    private int tpsSeverity() {
+        float tps = this.currentTps();
+        return tps >= 18 ? 0 : tps >= 15 ? 1 : 2;
+    }
+
+    private int msptSeverity() {
+        return this.currentMspt() <= 50 ? 0 : 2;
+    }
+
+    private int playerSeverity() {
+        int freeSlots = this.getMaxPlayerCount() - this.currentPlayerCount();
+        return freeSlots <= 0 ? 2 : freeSlots < 5 ? 1 : 0;
+    }
+
+    private float currentTps() {
+        return (float) Bukkit.getTPS()[0];
+    }
+
+    private float currentMspt() {
+        return ServerMonitor.getServerMSPT();
+    }
+
+    private int currentPlayerCount() {
+        return Bukkit.getOnlinePlayers().size();
+    }
+
+    private int getMaxPlayerCount() {
+        return Main.instance().getAppliance(PlayerLimit.class).getLimit();
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/networkChat/ChatMentionSetting.java

@@ -1,4 +1,4 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.chatMention;
+package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.networkChat;
 
 import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.CategorizedSetting;
 import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.SettingCategory;
@@ -29,7 +29,7 @@ public class ChatMentionSetting extends MultiBoolSetting<ChatMentionSetting.Chat
 
     @Override
     protected String description() {
-        return "Erwähnungen werden automatisch im Chat angewandt und der Empfänger erhält einen Signalton";
+        return "Wirst du im Chat erwähnt, wird dein Name hervorgehoben und du hörst einen Signalton";
     }
 
     @Override

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/networkChat/NetworkChat.java

@@ -0,0 +1,101 @@
+package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.networkChat;
+
+import com.google.common.io.ByteArrayDataInput;
+import com.google.common.io.ByteArrayDataOutput;
+import com.google.common.io.ByteStreams;
+import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.Settings;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Listener;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Chat läuft über Velocity (Plugin chat-bridge): Der öffentliche Chat, /msg, /r, /adminchat, /mute und
+ * Join/Leave-Meldungen gelten im ganzen Netzwerk. Hier wird der Chat nur verworfen, Velocity bekommt
+ * die Rang-Prefixe für den Namen, und die Chat-Einstellungen werden mit Velocity abgeglichen.
+ * <p>
+ * Kanal {@value #channel}, Nachrichten (UTF-Typ, dann Daten):
+ * <ul>
+ *   <li>→ Proxy {@code prefix}: Adventure-JSON oder leer</li>
+ *   <li>→ Proxy {@code settings-hello} beim Join, {@code settings-set} nach einer Änderung: Join/Leave,
+ *       Erwähnungen hervorheben, Erwähnungston (je boolean). Velocity speichert sie; kennt es schon
+ *       Werte, antwortet es auf das Hello mit {@code settings}.</li>
+ *   <li>← Proxy {@code settings}: gespeicherte Werte, werden hier übernommen</li>
+ * </ul>
+ */
+public class NetworkChat extends Appliance {
+    public static final String channel = "craftattack:chat";
+
+    private final Map<UUID, Component> prefixes = new ConcurrentHashMap<>();
+
+    @Override
+    public void onEnable() {
+        Bukkit.getMessenger().registerOutgoingPluginChannel(Main.instance(), channel);
+        Bukkit.getMessenger().registerIncomingPluginChannel(Main.instance(), channel, (channel, player, message) -> this.receive(player, message));
+
+        Settings.instance().declareSetting(ShowJoinAndLeaveMessagesSetting.class);
+        Settings.instance().declareSetting(ChatMentionSetting.class);
+        Settings.instance().addChangeListener(ShowJoinAndLeaveMessagesSetting.class, player -> this.sendSettings(player, "settings-set"));
+        Settings.instance().addChangeListener(ChatMentionSetting.class, player -> this.sendSettings(player, "settings-set"));
+    }
+
+    public void setPrefix(Player player, @Nullable Component prefix) {
+        if(prefix == null) this.prefixes.remove(player.getUniqueId());
+        else this.prefixes.put(player.getUniqueId(), prefix);
+        this.sendPrefix(player);
+    }
+
+    void sendPrefix(Player player) {
+        Component prefix = this.prefixes.get(player.getUniqueId());
+        ByteArrayDataOutput output = ByteStreams.newDataOutput();
+        output.writeUTF("prefix");
+        output.writeUTF(prefix == null ? "" : GsonComponentSerializer.gson().serialize(prefix));
+        this.send(player, output);
+    }
+
+    void sendSettings(Player player, String type) {
+        ChatMentionSetting.ChatMentionConfig mentions = Settings.instance()
+            .getSetting(player, Settings.Key.ChatMentions, ChatMentionSetting.ChatMentionConfig.class);
+        ByteArrayDataOutput output = ByteStreams.newDataOutput();
+        output.writeUTF(type);
+        output.writeBoolean(Settings.instance().getSetting(player, Settings.Key.ShowJoinAndLeaveMessages, Boolean.class));
+        output.writeBoolean(mentions.applyMentions());
+        output.writeBoolean(mentions.notifyOnMention());
+        this.send(player, output);
+    }
+
+    private void receive(Player player, byte[] message) {
+        ByteArrayDataInput input = ByteStreams.newDataInput(message);
+        if(!input.readUTF().equals("settings")) return;
+        boolean joinAndLeave = input.readBoolean();
+        boolean applyMentions = input.readBoolean();
+        boolean notifyOnMention = input.readBoolean();
+        Settings.instance().setSetting(player, Settings.Key.ShowJoinAndLeaveMessages, joinAndLeave);
+        Settings.instance().setSetting(player, Settings.Key.ChatMentions, new ChatMentionSetting.ChatMentionConfig(applyMentions, notifyOnMention));
+    }
+
+    private void send(Player player, ByteArrayDataOutput output) {
+        // Velocity meldet den Kanal erst kurz nach dem Join an, dann folgt PlayerRegisterChannelEvent
+        if(!player.getListeningPluginChannels().contains(channel)) return;
+        player.sendPluginMessage(Main.instance(), channel, output.toByteArray());
+    }
+
+    void forget(Player player) {
+        this.prefixes.remove(player.getUniqueId());
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(new NetworkChatListener());
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/networkChat/NetworkChatListener.java

@@ -0,0 +1,74 @@
+package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.networkChat;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import io.papermc.paper.event.player.AsyncChatEvent;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.text.format.TextColor;
+import org.bukkit.Color;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.entity.PlayerDeathEvent;
+import org.bukkit.event.player.PlayerCommandPreprocessEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.player.PlayerRegisterChannelEvent;
+
+import java.util.Locale;
+import java.util.Optional;
+import java.util.Set;
+
+class NetworkChatListener extends ApplianceListener<NetworkChat> {
+    // Vanilla-Befehle, die am Proxy vorbei in den lokalen Chat schreiben; /msg, /tell, /w fängt Velocity ab
+    private static final Set<String> localChatCommands = Set.of(
+        "me", "minecraft:me", "teammsg", "tm", "minecraft:teammsg", "minecraft:tm",
+        "minecraft:msg", "minecraft:tell", "minecraft:w"
+    );
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onChat(AsyncChatEvent event) {
+        // Velocity hat die Nachricht schon an alle verteilt
+        event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onCommand(PlayerCommandPreprocessEvent event) {
+        String label = event.getMessage().substring(1).split(" ", 2)[0].toLowerCase(Locale.ROOT);
+        if(!localChatCommands.contains(label)) return;
+        event.setCancelled(true);
+        event.getPlayer().sendMessage(Component.text("Dieser Befehl ist hier nicht verfügbar.", NamedTextColor.RED));
+    }
+
+    @EventHandler
+    public void onRegisterChannel(PlayerRegisterChannelEvent event) {
+        if(!event.getChannel().equals(NetworkChat.channel)) return;
+        this.getAppliance().sendPrefix(event.getPlayer());
+        this.getAppliance().sendSettings(event.getPlayer(), "settings-hello");
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onJoin(PlayerJoinEvent event) {
+        // Join- und Leave-Meldungen schreibt Velocity, beim Serverwechsel gar keine
+        event.joinMessage(null);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onQuit(PlayerQuitEvent event) {
+        event.quitMessage(null);
+        this.getAppliance().forget(event.getPlayer());
+    }
+
+    @EventHandler
+    public void onDeath(PlayerDeathEvent event) {
+        event.deathMessage(
+            Component
+                .text("☠ ")
+                .append(
+                    Optional
+                        .ofNullable(event.deathMessage())
+                        .orElse(Component.text(event.getPlayer().getName()))
+                )
+                .color(TextColor.color(Color.SILVER.asRGB()))
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/networkChat/ShowJoinAndLeaveMessagesSetting.java

@@ -1,4 +1,4 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.chatMessages;
+package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.networkChat;
 
 import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.CategorizedSetting;
 import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.settings.SettingCategory;

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/privateMessage/PrivateMessage.java

@@ -1,194 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.privateMessage;
-
-import eu.mhsl.craftattack.spawn.core.Main;
-import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.chatMessages.ChatMessages;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.privateMessage.commands.PrivateMessageCommand;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.privateMessage.commands.PrivateReplyCommand;
-import net.kyori.adventure.text.Component;
-import net.kyori.adventure.text.ComponentBuilder;
-import net.kyori.adventure.text.TextComponent;
-import net.kyori.adventure.text.event.ClickEvent;
-import net.kyori.adventure.text.event.HoverEvent;
-import net.kyori.adventure.text.format.NamedTextColor;
-import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.*;
-import java.util.stream.Collectors;
-
-public class PrivateMessage extends Appliance {
-    public final int targetChangeTimeoutSeconds = 30;
-    public final int conversationTimeoutMinutes = 30;
-
-    private record Conversation(UUID target, Long lastSet) {
-    }
-
-    private final Map<Player, List<Conversation>> replyMapping = new WeakHashMap<>();
-
-    public void reply(Player sender, String message) {
-        this.replyMapping.computeIfAbsent(sender, player -> new ArrayList<>());
-
-        List<Conversation> replyList = this.replyMapping.get(sender);
-
-        List<Conversation> tooOldConversations = replyList.stream()
-            .filter(conversation -> conversation.lastSet < System.currentTimeMillis() - (this.conversationTimeoutMinutes * 60 * 1000))
-            .toList();
-        replyList.removeAll(tooOldConversations);
-
-        if(replyList.isEmpty()) throw new ApplianceCommand.Error("Du führst aktuell keine Konversation.");
-
-        Component privatePrefix = Component.text("[Privat] ", NamedTextColor.LIGHT_PURPLE);
-
-        Conversation youngestEntry = replyList.stream()
-            .max(Comparator.comparingLong(o -> o.lastSet))
-            .orElse(replyList.getLast());
-
-        if(message.isBlank()) {
-            Player currentTargetPlayer = Bukkit.getPlayer(youngestEntry.target());
-
-            Component currentTargetComponent = currentTargetPlayer != null
-                ? Main.instance().getAppliance(ChatMessages.class).getReportablePlayerName(currentTargetPlayer)
-                : Component.text("niemandem.");
-
-            sender.sendMessage(
-                privatePrefix
-                    .append(Component.text("Du schreibst aktuell mit ", NamedTextColor.GRAY))
-                    .append(currentTargetComponent)
-            );
-            return;
-        }
-
-        List<Conversation> oldConversations = replyList.stream()
-            .filter(conversation -> conversation.lastSet < System.currentTimeMillis() - (this.targetChangeTimeoutSeconds * 1000))
-            .toList();
-
-        if(oldConversations.contains(youngestEntry) || replyList.size() == 1) {
-            Player target = Bukkit.getPlayer(youngestEntry.target());
-            if(target == null)
-                throw new ApplianceCommand.Error("Der Spieler " + Bukkit.getOfflinePlayer(youngestEntry.target()).getName() + " ist nicht mehr verfügbar.");
-
-            replyList.clear();
-            this.sendWhisper(sender, new ResolvedPmUserArguments(target, message));
-            return;
-        }
-
-        ComponentBuilder<TextComponent, TextComponent.Builder> component = Component.text();
-
-        component.append(
-            Component.newline()
-                .append(privatePrefix)
-                .append(Component.text("Das Ziel für /r hat sich bei dir in den letzten ", NamedTextColor.RED))
-                .append(Component.text(String.valueOf(this.targetChangeTimeoutSeconds), NamedTextColor.RED))
-                .append(Component.text(" Sekunden geändert. Wer soll deine Nachricht erhalten? ", NamedTextColor.RED))
-                .appendNewline()
-                .appendNewline()
-        );
-
-        if(!oldConversations.isEmpty()) {
-            Conversation youngestOldConversation = oldConversations.stream()
-                .max(Comparator.comparingLong(o -> o.lastSet))
-                .orElse(oldConversations.getLast());
-            replyList.removeAll(oldConversations);
-            replyList.add(youngestOldConversation);
-        }
-
-        List<String> playerNames = replyList.stream()
-            .map(conversation -> Bukkit.getOfflinePlayer(conversation.target()).getName())
-            .distinct()
-            .toList();
-
-        playerNames.forEach(playerName -> component.append(
-                Component.text("[")
-                    .append(Component.text(playerName, NamedTextColor.GOLD))
-                    .append(Component.text("]"))
-                    .clickEvent(ClickEvent.runCommand(String.format("/msg %s %s", playerName, message)))
-                    .hoverEvent(HoverEvent.showText(Component.text("Klicke, um diesem Spieler zu schreiben.").color(NamedTextColor.GOLD))))
-            .append(Component.text("  "))
-        );
-        component.appendNewline();
-
-        sender.sendMessage(component.build());
-
-    }
-
-    public void sendWhisper(Player sender, ResolvedPmUserArguments userArguments) {
-        Conversation newReceiverConversation = new Conversation(
-            sender.getUniqueId(),
-            System.currentTimeMillis()
-        );
-
-        if(this.replyMapping.get(userArguments.receiver) != null) {
-            List<Conversation> oldEntries = this.replyMapping.get(userArguments.receiver).stream()
-                .filter(conversation -> conversation.target() == sender.getUniqueId())
-                .toList();
-            this.replyMapping.get(userArguments.receiver).removeAll(oldEntries);
-        } else {
-            this.replyMapping.put(
-                userArguments.receiver,
-                new ArrayList<>()
-            );
-        }
-
-        this.replyMapping.get(userArguments.receiver).add(newReceiverConversation);
-
-        List<Conversation> senderConversationList = new ArrayList<>();
-        senderConversationList.add(
-            new Conversation(
-                userArguments.receiver.getUniqueId(),
-                System.currentTimeMillis()
-            )
-        );
-
-        this.replyMapping.put(
-            sender,
-            senderConversationList
-        );
-
-        ChatMessages chatMessages = Main.instance().getAppliance(ChatMessages.class);
-        Component privatePrefix = Component.text("[Privat] ", NamedTextColor.LIGHT_PURPLE);
-
-        sender.sendMessage(
-            Component.text()
-                .append(privatePrefix.clickEvent(ClickEvent.suggestCommand(String.format("/msg %s ", userArguments.receiver.getName()))))
-                .append(sender.displayName())
-                .append(Component.text(" zu ", NamedTextColor.GRAY))
-                .append(chatMessages.getReportablePlayerName(userArguments.receiver))
-                .append(Component.text(" > ", NamedTextColor.GRAY))
-                .append(Component.text(userArguments.message))
-        );
-        userArguments.receiver.sendMessage(
-            Component.text()
-                .append(privatePrefix.clickEvent(ClickEvent.suggestCommand(String.format("/msg %s ", sender.getName()))))
-                .append(chatMessages.getReportablePlayerName(sender))
-                .append(Component.text(" zu ", NamedTextColor.GRAY))
-                .append(userArguments.receiver.displayName())
-                .append(Component.text(" > ", NamedTextColor.GRAY))
-                .append(Component.text(userArguments.message))
-        );
-    }
-
-    public record ResolvedPmUserArguments(Player receiver, String message) {
-    }
-
-    public ResolvedPmUserArguments resolveImplicit(String[] args) {
-        if(args.length < 2)
-            throw new ApplianceCommand.Error("Es muss ein Spieler sowie eine Nachricht angegeben werden.");
-        List<String> arguments = List.of(args);
-        Player targetPlayer = Bukkit.getPlayer(arguments.getFirst());
-        if(targetPlayer == null)
-            throw new ApplianceCommand.Error(String.format("Der Spieler %s konnte nicht gefunden werden.", arguments.getFirst()));
-        String message = arguments.stream().skip(1).collect(Collectors.joining(" "));
-        return new ResolvedPmUserArguments(targetPlayer, message);
-    }
-
-    @Override
-    protected @NotNull List<ApplianceCommand<?>> commands() {
-        return List.of(
-            new PrivateMessageCommand(),
-            new PrivateReplyCommand()
-        );
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/privateMessage/commands/PrivateMessageCommand.java

@@ -1,18 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.privateMessage.commands;
-
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.privateMessage.PrivateMessage;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandSender;
-import org.jetbrains.annotations.NotNull;
-
-public class PrivateMessageCommand extends ApplianceCommand.PlayerChecked<PrivateMessage> {
-    public PrivateMessageCommand() {
-        super("msg");
-    }
-
-    @Override
-    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) throws Exception {
-        this.getAppliance().sendWhisper(this.getPlayer(), this.getAppliance().resolveImplicit(args));
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/privateMessage/commands/PrivateReplyCommand.java

@@ -1,18 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.privateMessage.commands;
-
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
-import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.privateMessage.PrivateMessage;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandSender;
-import org.jetbrains.annotations.NotNull;
-
-public class PrivateReplyCommand extends ApplianceCommand.PlayerChecked<PrivateMessage> {
-    public PrivateReplyCommand() {
-        super("r");
-    }
-
-    @Override
-    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) throws Exception {
-        this.getAppliance().reply(this.getPlayer(), String.join(" ", args));
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/report/Report.java

@@ -1,11 +1,14 @@
 package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.report;
 
 import eu.mhsl.craftattack.spawn.common.api.repositories.ReportRepository;
+import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.report.listeners.ReportCreatedListener;
+import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.report.listeners.ReportJoinListener;
 import eu.mhsl.craftattack.spawn.core.Main;
 import eu.mhsl.craftattack.spawn.core.api.client.ReqResp;
 import eu.mhsl.craftattack.spawn.common.api.repositories.CraftAttackReportRepository;
 import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
 import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
+import eu.mhsl.craftattack.spawn.core.util.text.ComponentUtil;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.ComponentBuilder;
 import net.kyori.adventure.text.TextComponent;
@@ -15,11 +18,14 @@ import net.kyori.adventure.text.format.NamedTextColor;
 import org.bukkit.Bukkit;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.entity.Player;
+import org.bukkit.event.Listener;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
+import java.util.Objects;
 import java.util.Optional;
+import java.util.function.Function;
 
 public class Report extends Appliance {
     public static Component helpText() {
@@ -78,8 +84,8 @@ public class Report extends Appliance {
                         .appendNewline()
                         .append(
                             Component
-                                .text(createdReport.data().url(), NamedTextColor.GRAY) // URL mit Weltkugel-Emoji
-                                .clickEvent(ClickEvent.clickEvent(ClickEvent.Action.OPEN_URL, createdReport.data().url()))
+                                .text(createdReport.data().url(), NamedTextColor.GRAY)
+                                .clickEvent(ClickEvent.openUrl(createdReport.data().url()))
                         )
                         .appendNewline()
                         .appendNewline()
@@ -128,44 +134,80 @@ public class Report extends Appliance {
             return;
         }
 
-        List<ReportRepository.PlayerReports.Report> reports = userReports
-            .data()
-            .from_self()
-            .stream()
-            .filter(report -> !report.draft())
-            .toList()
-            .reversed();
+        Function<List<ReportRepository.PlayerReports.Report>, List<ReportRepository.PlayerReports.Report>> filterClosed = reports -> reports.stream()
+            .filter(report -> Objects.equals(report.status(), ReportRepository.Status.closed))
+            .toList();
 
-        if(reports.isEmpty()) {
-            issuer.sendMessage(
-                Component.text()
-                    .append(Component.text("Du hast noch niemanden reportet.", NamedTextColor.RED))
-                    .appendNewline()
-                    .append(Component.text("Um jemanden zu melden, nutze /report", NamedTextColor.GRAY))
+        List<ReportRepository.PlayerReports.Report> reportsToOthers = filterClosed.apply(userReports.data().from_self()).reversed();
+        List<ReportRepository.PlayerReports.Report> reportsToSelf = filterClosed.apply(userReports.data().to_self()).reversed();
+
+        ComponentBuilder<TextComponent, TextComponent.Builder> component = Component.text()
+            .append(Component.text(
+                !reportsToSelf.isEmpty()
+                    ? "Du wurdest insgesamt %d mal von anderen Spielern gemeldet.".formatted(reportsToSelf.size())
+                    : "Du wurdest von keinem anderen Spieler gemeldet.",
+                NamedTextColor.GOLD)
             );
+
+        component.appendNewline();
+
+        component.append(Component.text("Von dir erstellte Reports: ", NamedTextColor.GOLD));
+        reportsToOthers.forEach(report -> {
+            Component button = Component.text("[\uD83D\uDC41/\uD83D\uDD8A]")
+                .clickEvent(ClickEvent.openUrl(report.url()))
+                .hoverEvent(HoverEvent.showText(ComponentUtil.clickLink(report.url())));
+
+            Component reportedDisplayName = report.reported() != null
+                ? Component.text(Optional.ofNullable(Bukkit.getOfflinePlayer(report.reported()).getName()).orElse(report.reported().toString()), NamedTextColor.WHITE)
+                : Component.text("Unbekannt", NamedTextColor.YELLOW);
+
+            component
+                .appendNewline()
+                .append(Component.text(" \u27A1 ", NamedTextColor.GRAY))
+                .append(button)
+                .append(Component.text(" du gegen ", NamedTextColor.GRAY))
+                .append(reportedDisplayName)
+                .append(Component.text(String.format(": %s", report.reason()), NamedTextColor.GRAY));
+        });
+
+        if(reportsToOthers.isEmpty()) {
+            component
+                .appendNewline()
+                .append(Component.text("Du hast noch niemanden reportet.", NamedTextColor.RED))
+                .appendNewline()
+                .append(Component.text("Um jemanden zu melden, nutze /report", NamedTextColor.GRAY));
+        }
+
+        issuer.sendMessage(component.build());
+    }
+
+    public void sendReportsInfo(Player player) {
+        ReqResp<ReportRepository.AllReports> allReportsResponse = this.queryRepository(CraftAttackReportRepository.class).queryAllReports();
+
+        if(allReportsResponse.status() != 200) {
+            Main.logger().warning("Failed to request Reports: " + allReportsResponse.status());
             return;
         }
 
-        ComponentBuilder<TextComponent, TextComponent.Builder> component = Component.text()
-            .append(Component.newline())
-            .append(Component.text("Von dir erstellte Reports: ", NamedTextColor.GOLD))
-            .appendNewline();
+        List<ReportRepository.AllReports.Report> allOpenReports = allReportsResponse.data().reports().stream()
+            .filter(report -> report.status() == null && report.created() != null)
+            .toList();
 
-        reports.forEach(report -> {
-            component
-                .append(Component.text(" - ", NamedTextColor.WHITE))
-                .append(
-                    report.reported() != null
-                        ? Component.text(report.reported().username(), NamedTextColor.WHITE)
-                        : Component.text("Unbekannt", NamedTextColor.YELLOW)
-                )
-                .append(Component.text(String.format(": %s", report.subject()), NamedTextColor.GRAY))
-                .clickEvent(ClickEvent.openUrl(report.url()))
-                .hoverEvent(HoverEvent.showText(Component.text("Klicke, um den Report einzusehen.", NamedTextColor.GOLD)));
-            component.appendNewline();
-        });
+        if(allOpenReports.isEmpty()) return;
 
-        issuer.sendMessage(component.build());
+        player.sendMessage(
+            Component.text("Hey, es gibt noch ", NamedTextColor.GOLD)
+                .append(Component.text(allOpenReports.size(), NamedTextColor.RED))
+                .append(Component.text(" unbearbeitete Reports!", NamedTextColor.GOLD))
+        );
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(
+            new ReportCreatedListener(),
+            new ReportJoinListener()
+        );
     }
 
     @Override

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/report/ReportCommand.java

@@ -13,6 +13,7 @@ import org.jetbrains.annotations.Nullable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -46,7 +47,7 @@ class ReportCommand extends ApplianceCommand.PlayerChecked<Report> {
             response = Stream.concat(
                 Bukkit.getOnlinePlayers().stream().map(Player::getName),
                 Arrays.stream(Bukkit.getOfflinePlayers()).map(OfflinePlayer::getName)
-            ).toList();
+            ).filter(Objects::nonNull).distinct().toList();
         }
 
         if(args.length == 2) {

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/report/listeners/ReportCreatedListener.java

@@ -0,0 +1,27 @@
+package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.report.listeners;
+
+import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.report.Report;
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import eu.mhsl.craftattack.spawn.core.event.ReportCreatedEvent;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.event.EventHandler;
+
+public class ReportCreatedListener extends ApplianceListener<Report> {
+    @EventHandler
+    public void onReport(ReportCreatedEvent event) {
+        OfflinePlayer reporter = Bukkit.getOfflinePlayer(event.getReport().reporter());
+        OfflinePlayer reported = Bukkit.getOfflinePlayer(event.getReport().reported());
+
+        Component message = Component.text(
+            "\uD83D\uDD14 Neuer Report von %s gegen %s: %s".formatted(reporter.getName(), reported.getName(), event.getReport().reason()),
+            NamedTextColor.YELLOW
+        );
+
+        Bukkit.getOnlinePlayers().stream()
+            .filter(player -> player.hasPermission("admin"))
+            .forEach(player -> player.sendMessage(message));
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/report/listeners/ReportJoinListener.java

@@ -0,0 +1,19 @@
+package eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.report.listeners;
+
+import eu.mhsl.craftattack.spawn.common.appliances.metaGameplay.report.Report;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.Bukkit;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+public class ReportJoinListener extends ApplianceListener<Report> {
+    @EventHandler
+    public void onPlayerJoin(PlayerJoinEvent event) {
+        if(!event.getPlayer().hasPermission("admin")) return;
+        Bukkit.getScheduler().runTaskAsynchronously(
+            Main.instance(),
+            () -> this.getAppliance().sendReportsInfo(event.getPlayer())
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/settings/Settings.java

@@ -112,6 +112,18 @@ public class Settings extends Appliance {
         return clazz.cast(setting.state());
     }
 
+    /** Setzt einen Wert von außen (z. B. vom Proxy), ohne die Change-Listener auszulösen. */
+    public <T> void setSetting(Player player, Key key, T value) {
+        Setting<?> setting = this.getSettings(player).stream()
+            .filter(s -> Objects.equals(s.getKey(), key))
+            .findFirst()
+            .orElseThrow();
+
+        if(!setting.dataType().isInstance(value))
+            throw new IllegalStateException("Tried to set Setting with Datatype " + value.getClass().getSimpleName() + " but expected " + setting.dataType().getSimpleName());
+        setting.restore(player, value);
+    }
+
     public void openSettings(Player player) {
         List<Setting<?>> settings = this.getSettings(player);
         Inventory inventory = Bukkit.createInventory(null, this.calculateInvSize(settings), Component.text("Einstellungen"));
@@ -128,12 +140,12 @@ public class Settings extends Appliance {
                 if(categorizedSettings.isEmpty()) return;
 
                 for(int i = 0; i < categorizedSettings.size(); i++) {
-                    int slot = row.get() * 9 + i % 9;
-                    inventory.setItem(slot, categorizedSettings.get(i).buildItem());
-
-                    if(i % 9 == 8) {
+                    if(i % 9 == 0 && i != 0) {
                         row.incrementAndGet();
                     }
+
+                    int slot = row.get() * 9 + i % 9;
+                    inventory.setItem(slot, categorizedSettings.get(i).buildItem());
                 }
                 row.incrementAndGet();
             });
@@ -143,12 +155,12 @@ public class Settings extends Appliance {
             .toList();
 
         for(int i = 0; i < uncategorizedSettings.size(); i++) {
-            int slot = row.get() * 9 + i % 9;
-            inventory.setItem(slot, uncategorizedSettings.get(i).buildItem());
-
-            if(i % 9 == 8) {
+            if(i % 9 == 0 && i != 0) {
                 row.incrementAndGet();
             }
+
+            int slot = row.get() * 9 + i % 9;
+            inventory.setItem(slot, uncategorizedSettings.get(i).buildItem());
         }
 
         player.openInventory(inventory);

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/settings/SettingsShortcutSetting.java

@@ -25,7 +25,7 @@ public class SettingsShortcutSetting extends BoolSetting implements CategorizedS
 
     @Override
     protected Boolean defaultValue() {
-        return false;
+        return true;
     }
 
     @Override

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/metaGameplay/settings/datatypes/Setting.java

@@ -62,6 +62,12 @@ public abstract class Setting<TDataType> {
         Settings.instance().invokeChangeListener(p, this.getClass());
     }
 
+    @SuppressWarnings("unchecked")
+    public void restore(Player p, Object value) {
+        this.state = (TDataType) value;
+        this.toStorage(p.getPersistentDataContainer(), this.state);
+    }
+
     public ItemStack buildItem() {
         ItemStack stack = new ItemStack(this.icon(), 1);
         stack.setItemMeta(this.buildMeta(stack.getItemMeta()));

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiBoatFreecam/AntiBoatFreecam.java

@@ -0,0 +1,45 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiBoatFreecam;
+
+import eu.mhsl.craftattack.spawn.common.appliances.tooling.acInform.AcInform;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Boat;
+
+@SuppressWarnings("unused")
+@Appliance.Flags(enabled = false)
+public class AntiBoatFreecam extends Appliance {
+    private static final float MAX_YAW_OFFSET = 106.0f;
+
+    public AntiBoatFreecam() {
+        Bukkit.getScheduler().runTaskTimerAsynchronously(
+            Main.instance(),
+            () -> Bukkit.getOnlinePlayers().forEach(player -> {
+                if(!(player.getVehicle() instanceof Boat boat)) return;
+                if(!boat.getPassengers().getFirst().equals(player)) return;
+                float playerYaw = player.getYaw();
+                float boatYaw = boat.getYaw();
+
+                float yawDelta = wrapDegrees(playerYaw - boatYaw);
+                if(Math.abs(yawDelta) <= MAX_YAW_OFFSET) return;
+
+                Main.instance().getAppliance(AcInform.class).slowedNotifyAdmins(
+                    "internal",
+                    player.getName(),
+                    "illegalBoatLookYaw",
+                    yawDelta,
+                    3000
+                );
+            }),
+            1L,
+            1L
+        );
+    }
+
+    private static float wrapDegrees(float deg) {
+        deg = deg % 360f;
+        if (deg >= 180f) deg -= 360f;
+        if (deg < -180f) deg += 360f;
+        return deg;
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/AntiFormattedBook.java

@@ -0,0 +1,66 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiFormattedBook;
+
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import net.kyori.adventure.text.*;
+import net.kyori.adventure.text.format.Style;
+import net.kyori.adventure.text.format.TextColor;
+import net.kyori.adventure.text.format.TextDecoration;
+import org.bukkit.event.Listener;
+import org.bukkit.inventory.meta.BookMeta;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+import java.util.Objects;
+
+public class AntiFormattedBook extends Appliance {
+    private static final char SECTION = '\u00A7';
+
+    public boolean containsFormatting(BookMeta meta) {
+        if (this.hasFormattingDeep(meta.title())) return true;
+        if (this.hasFormattingDeep(meta.author())) return true;
+
+        for (Component c : meta.pages()) {
+            if (this.hasFormattingDeep(c)) return true;
+        }
+        return false;
+    }
+
+    private boolean hasFormattingDeep(@Nullable Component component) {
+        if(component == null) return false;
+        if (this.hastFormatting(component)) return true;
+
+        if (component instanceof TextComponent tc && tc.content().indexOf(SECTION) >= 0) return true;
+
+        if (component instanceof NBTComponent<?> nbt) {
+            if (nbt.separator() != null && this.hasFormattingDeep(nbt.separator())) return true;
+        }
+
+        for (Component child : component.children()) {
+            if (this.hasFormattingDeep(child)) return true;
+        }
+        return false;
+    }
+
+    private boolean hastFormatting(Component component) {
+        Style style = component.style();
+
+        TextColor color = style.color();
+        if (color != null) return true;
+        if (style.font() != null) return true;
+        if (style.insertion() != null && !Objects.requireNonNull(style.insertion()).isEmpty()) return true;
+
+        for (var decoration : style.decorations().entrySet()) {
+            if (decoration.getValue() == TextDecoration.State.TRUE) return true;
+        }
+
+        return style.hoverEvent() != null || style.clickEvent() != null;
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(
+            new BookEditListener()
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/BookEditListener.java

@@ -0,0 +1,36 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiFormattedBook;
+
+import eu.mhsl.craftattack.spawn.common.appliances.tooling.acInform.AcInform;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import net.kyori.adventure.text.Component;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerEditBookEvent;
+import org.bukkit.inventory.meta.BookMeta;
+
+import java.util.List;
+
+class BookEditListener extends ApplianceListener<AntiFormattedBook> {
+    @EventHandler
+    public void onBookEdit(PlayerEditBookEvent event) {
+        Player player = event.getPlayer();
+        BookMeta meta = event.getNewBookMeta();
+
+        if (this.getAppliance().containsFormatting(meta)) {
+            Main.instance().getAppliance(AcInform.class).notifyAdmins(
+                "internal",
+                player.getName(),
+                "illegalBookFormatting",
+                1f
+            );
+
+            BookMeta sanitized = meta.clone();
+            sanitized.title(null);
+            sanitized.author(null);
+            //noinspection ResultOfMethodCallIgnored
+            sanitized.pages(List.of(Component.empty()));
+            event.setNewBookMeta(sanitized);
+        }
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiIllegalBundlePicker/AntiIllegalBundlePicker.java

@@ -0,0 +1,78 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiIllegalBundlePicker;
+
+import eu.mhsl.craftattack.spawn.common.appliances.tooling.acInform.AcInform;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BundleMeta;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class AntiIllegalBundlePicker extends Appliance {
+    private static final int visibleSlotsInBundle = 9;
+
+    public void trackBundle(InventoryClickEvent event) {
+        ItemStack bundle = Objects.requireNonNull(event.getCurrentItem());
+        final int rawSlot = event.getRawSlot();
+        final Player player = (Player) event.getWhoClicked();
+        final InventoryView view = event.getView();
+        final List<ItemStack> before = this.getBundleContents(bundle);
+
+        Bukkit.getScheduler().runTask(Main.instance(), () -> {
+            ItemStack afterStack = view.getItem(rawSlot);
+            if(afterStack == null || afterStack.getType() != Material.BUNDLE) return;
+
+            List<ItemStack> after = this.getBundleContents(afterStack);
+            int removedSlotIndex = this.findRemoved(before, after);
+
+            if(removedSlotIndex >= visibleSlotsInBundle) {
+                Main.instance().getAppliance(AcInform.class).notifyAdmins(
+                    "internal",
+                    player.getName(),
+                    "illegalBundlePick",
+                    (float) removedSlotIndex
+                );
+            }
+        });
+    }
+
+    private int findRemoved(@NotNull List<ItemStack> before, @NotNull List<ItemStack> after) {
+        for (int i = 0; i < Math.max(before.size(), after.size()); i++) {
+            ItemStack a = i < after.size() ? after.get(i) : null;
+            ItemStack b = i < before.size() ? before.get(i) : null;
+
+            if (b == null && a == null) continue;
+            if (b == null) throw new IllegalStateException("Size of bundle was smaller before pickup Action");
+
+            if (a == null) return i;
+            if (!a.isSimilar(b)) return i;
+            if (a.getAmount() != b.getAmount()) return i;
+        }
+        throw new IllegalStateException("Failed to find picked Item in bundle");
+    }
+
+    private List<ItemStack> getBundleContents(@NotNull ItemStack bundle) {
+        if (bundle.getType() != Material.BUNDLE)
+            throw new IllegalStateException("ItemStack is not a bundle");
+
+        BundleMeta meta = (BundleMeta) bundle.getItemMeta();
+        return meta.getItems().stream()
+            .map(ItemStack::clone)
+            .collect(Collectors.toCollection(ArrayList::new));
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(
+            new OnBundlePickListener()
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiIllegalBundlePicker/OnBundlePickListener.java

@@ -0,0 +1,18 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiIllegalBundlePicker;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.Material;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.inventory.ItemStack;
+
+class OnBundlePickListener extends ApplianceListener<AntiIllegalBundlePicker> {
+    @EventHandler
+    public void onBundlePick(InventoryClickEvent event) {
+        if(!event.getAction().equals(InventoryAction.PICKUP_FROM_BUNDLE)) return;
+        final ItemStack bundle = event.getCurrentItem();
+        if (bundle == null || bundle.getType() != Material.BUNDLE) return;
+        this.getAppliance().trackBundle(event);
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiIllegalSignCharacters/AntiIllegalSignCharacters.java

@@ -0,0 +1,16 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiIllegalSignCharacters;
+
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import org.bukkit.event.Listener;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+public class AntiIllegalSignCharacters extends Appliance {
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(
+            new SignEditListener()
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiIllegalSignCharacters/SignEditListener.java

@@ -0,0 +1,77 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiIllegalSignCharacters;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.block.SignChangeEvent;
+
+import java.text.Normalizer;
+import java.util.Set;
+
+class SignEditListener extends ApplianceListener<AntiIllegalSignCharacters> {
+    private static final Set<Integer> ALLOWED_CHARS = Set.of(
+        (int)' ', (int)'.', (int)',', (int)';', (int)':', (int)'!', (int)'?',
+        (int)'"', (int)'\'',
+        (int)'(', (int)')', (int)'[', (int)']', (int)'{', (int)'}',
+        (int)'-', (int)'_', (int)'+', (int)'=', (int)'/', (int)'\\',
+        (int)'@', (int)'#', (int)'$', (int)'%', (int)'&', (int)'*',
+        (int)'<', (int)'>', (int)'|',
+        (int)'~', (int)'`', (int)'^'
+    );
+
+    private static final Set<Integer> ALLOWED_EXTRA = Set.of(
+        (int)'Ä', (int)'Ö', (int)'Ü', (int)'ä', (int)'ö', (int)'ü', (int)'ß',
+        (int)'€', (int)'°', (int)'µ'
+    );
+
+    @EventHandler
+    public void onSignEdit(SignChangeEvent event) {
+        for (int i = 0; i < 4; i++) {
+            Component line = event.line(i);
+            if (line == null) continue;
+            String plainString = PlainTextComponentSerializer.plainText().serialize(line);
+            plainString = Normalizer.normalize(plainString, Normalizer.Form.NFC);
+            String cleaned = filterAllowed(plainString);
+            event.line(i, Component.text(cleaned));
+        }
+    }
+
+    private static String filterAllowed(String s) {
+        StringBuilder out = new StringBuilder(s.length());
+
+        for (int off = 0; off < s.length(); ) {
+            int cp = s.codePointAt(off);
+            off += Character.charCount(cp);
+
+            if (isForbidden(cp)) continue;
+
+            if (Character.isLetterOrDigit(cp)) {
+                out.appendCodePoint(cp);
+                continue;
+            }
+
+            if (ALLOWED_CHARS.contains(cp) || ALLOWED_EXTRA.contains(cp)) {
+                out.appendCodePoint(cp);
+            }
+        }
+        return out.toString();
+    }
+
+    private static boolean isForbidden(int cp) {
+        // Surrogates / invalid
+        if (cp >= 0xD800 && cp <= 0xDFFF) return true;
+
+        // Private Use Area (Mod/Pack-Icons/Placeholder)
+        if (cp >= 0xE000 && cp <= 0xF8FF) return true;
+
+        // Zero-width and control characters
+        if (cp == 0x200B || cp == 0x200C || cp == 0x200D || cp == 0xFEFF) return true;
+
+        // BiDi-Steuerzeichen
+        if (cp >= 0x202A && cp <= 0x202E) return true;
+        if (cp >= 0x2066 && cp <= 0x2069) return true;
+
+        return cp == '§';
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiInventoryMove/AntiInventoryMove.java

@@ -0,0 +1,39 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiInventoryMove;
+
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import net.kyori.adventure.util.Ticks;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Listener;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+@Appliance.Flags(enabled = false)
+public class AntiInventoryMove extends Appliance {
+    private static final long errorTimeMargin = Ticks.SINGLE_TICK_DURATION_MS * 2;
+
+    private final Map<UUID, Long> invOpen = new ConcurrentHashMap<>();
+
+    public void setInvOpen(Player player, boolean open) {
+        if(open)
+            this.invOpen.put(player.getUniqueId(), System.currentTimeMillis());
+        else
+            this.invOpen.remove(player.getUniqueId());
+    }
+
+    public boolean hasInventoryOpen(Player player) {
+        if(!this.invOpen.containsKey(player.getUniqueId())) return false;
+        return this.invOpen.get(player.getUniqueId()) < System.currentTimeMillis() - errorTimeMargin;
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(
+            new InventoryTrackerListener(),
+            new InInventoryMoveListener()
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiInventoryMove/InInventoryMoveListener.java

@@ -0,0 +1,21 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiInventoryMove;
+
+import eu.mhsl.craftattack.spawn.common.appliances.tooling.acInform.AcInform;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerInputEvent;
+
+class InInventoryMoveListener extends ApplianceListener<AntiInventoryMove> {
+    @EventHandler
+    public void onInput(PlayerInputEvent event) {
+        if(!this.getAppliance().hasInventoryOpen(event.getPlayer())) return;
+        Main.instance().getAppliance(AcInform.class).slowedNotifyAdmins(
+            "internal",
+            event.getPlayer().getName(),
+            "inInventoryMove",
+            -1f,
+            3000
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiInventoryMove/InventoryTrackerListener.java

@@ -0,0 +1,23 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiInventoryMove;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.inventory.InventoryCloseEvent;
+import org.bukkit.event.inventory.InventoryOpenEvent;
+
+class InventoryTrackerListener extends ApplianceListener<AntiInventoryMove> {
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onOpen(InventoryOpenEvent event) {
+        if(!(event.getPlayer() instanceof Player player)) return;
+        if(event.isCancelled()) return;
+        this.getAppliance().setInvOpen(player, true);
+    }
+
+    @EventHandler
+    public void onClose(InventoryCloseEvent event) {
+        if(!(event.getPlayer() instanceof Player player)) return;
+        this.getAppliance().setInvOpen(player, false);
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/acInform/AcInform.java

@@ -11,14 +11,20 @@ import org.bukkit.Bukkit;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
 public class AcInform extends Appliance {
+    private final Map<String, Map<String, Long>> violationSlowdowns = new ConcurrentHashMap<>();
+
     public void processCommand(@NotNull String[] args) {
         String anticheatName = null;
         String playerName = null;
         String checkName = null;
         Float violationCount = null;
+        int notifyEvery = 0;
 
         for(int i = 0; i < args.length; i++) {
             if(!args[i].startsWith("--")) continue;
@@ -36,13 +42,32 @@ public class AcInform extends Appliance {
                 case "--playerName" -> playerName = value;
                 case "--check" -> checkName = value;
                 case "--violationCount" -> violationCount = value.isEmpty() ? null : Float.valueOf(value);
+                case "--notifyEvery" -> notifyEvery = Integer.parseInt(value);
             }
         }
 
+        if(notifyEvery == 0) {
+            this.notifyAdmins(anticheatName, playerName, checkName, violationCount);
+        } else {
+            this.slowedNotifyAdmins(anticheatName, playerName, checkName, violationCount, notifyEvery);
+        }
+    }
+
+    public void slowedNotifyAdmins(@Nullable String anticheatName, @Nullable String playerName, @Nullable String checkName, @Nullable Float violationCount, int notifyEvery) {
+        this.violationSlowdowns.putIfAbsent(playerName, new HashMap<>());
+
+        var slowdowns = this.violationSlowdowns.get(playerName);
+        if(slowdowns.containsKey(checkName)) {
+            if(slowdowns.get(checkName) > System.currentTimeMillis() - notifyEvery) return;
+        }
+
         this.notifyAdmins(anticheatName, playerName, checkName, violationCount);
     }
 
     public void notifyAdmins(@Nullable String anticheatName, @Nullable String playerName, @Nullable String checkName, @Nullable Float violationCount) {
+        this.violationSlowdowns.putIfAbsent(playerName, new HashMap<>());
+        this.violationSlowdowns.get(playerName).put(checkName, System.currentTimeMillis());
+
         ComponentBuilder<TextComponent, TextComponent.Builder> component = Component.text();
         NamedTextColor textColor = NamedTextColor.GRAY;
 
@@ -85,28 +110,42 @@ public class AcInform extends Appliance {
             Component.newline()
                 .append(Component.text("⊥ ", NamedTextColor.GRAY))
                 .append(Component.text("[", NamedTextColor.GRAY))
-                .append(Component.text("Report", NamedTextColor.GOLD))
+                .append(Component.text("\uD83D\uDCD6", NamedTextColor.GOLD))
                 .append(Component.text("]", NamedTextColor.GRAY))
                 .clickEvent(ClickEvent.suggestCommand(String.format("/report %s anticheat %s flagged %s", playerName, anticheatName, checkName)))
         );
 
         component.append(
             Component.text(" [", NamedTextColor.GRAY)
-                .append(Component.text("Kick", NamedTextColor.GOLD))
+                .append(Component.text("\u23F1", NamedTextColor.GOLD))
                 .append(Component.text("]", NamedTextColor.GRAY))
                 .clickEvent(ClickEvent.suggestCommand(String.format("/kick %s", playerName)))
         );
 
         component.append(
             Component.text(" [", NamedTextColor.GRAY)
-                .append(Component.text("Panic Ban", NamedTextColor.GOLD))
+                .append(Component.text("\uD83E\uDDB6", NamedTextColor.GOLD))
+                .append(Component.text("]", NamedTextColor.GRAY))
+                .clickEvent(ClickEvent.suggestCommand(String.format("/kickunsuspected %s", playerName)))
+        );
+
+        component.append(
+            Component.text(" [", NamedTextColor.GRAY)
+                .append(Component.text("\u2623", NamedTextColor.GOLD))
+                .append(Component.text("]", NamedTextColor.GRAY))
+                .clickEvent(ClickEvent.suggestCommand(String.format("/kickcrash %s", playerName)))
+        );
+
+        component.append(
+            Component.text(" [", NamedTextColor.GRAY)
+                .append(Component.text("\uD83D\uDD12", NamedTextColor.GOLD))
                 .append(Component.text("]", NamedTextColor.GRAY))
                 .clickEvent(ClickEvent.suggestCommand(String.format("/panicban %s", playerName)))
         );
 
         component.append(
             Component.text(" [", NamedTextColor.GRAY)
-                .append(Component.text("Spectate/Teleport", NamedTextColor.GOLD))
+                .append(Component.text("\uD83D\uDC41", NamedTextColor.GOLD))
                 .append(Component.text("]", NamedTextColor.GRAY))
                 .clickEvent(ClickEvent.suggestCommand(String.format("/grim spectate %s", playerName)))
         );

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/adminChat/AdminChat.java

@@ -1,37 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.tooling.adminChat;
-
-import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
-import net.kyori.adventure.text.Component;
-import net.kyori.adventure.text.event.ClickEvent;
-import net.kyori.adventure.text.format.NamedTextColor;
-import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.List;
-
-public class AdminChat extends Appliance {
-    public void sendMessage(Player sender, String message) {
-        Component privatePrefix = Component
-            .text("[Admin] ", NamedTextColor.LIGHT_PURPLE)
-            .clickEvent(ClickEvent.suggestCommand(AdminChatCommand.commandName));
-
-        Bukkit.getOnlinePlayers().stream()
-            .filter(player -> player.hasPermission("admin"))
-            .forEach(player -> {
-                Component formattedMessage = Component.text()
-                    .append(privatePrefix)
-                    .append(sender.displayName())
-                    .append(Component.text(" > ", NamedTextColor.DARK_GRAY))
-                    .append(Component.text(message))
-                    .build();
-                player.sendMessage(formattedMessage);
-            });
-    }
-
-    @Override
-    protected @NotNull List<ApplianceCommand<?>> commands() {
-        return List.of(new AdminChatCommand());
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/adminChat/AdminChatCommand.java

@@ -1,22 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.tooling.adminChat;
-
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandSender;
-import org.jetbrains.annotations.NotNull;
-
-class AdminChatCommand extends ApplianceCommand.PlayerChecked<AdminChat> {
-    public static final String commandName = "adminchat";
-
-    public AdminChatCommand() {
-        super(commandName);
-    }
-
-    @Override
-    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) throws Exception {
-        if(!sender.hasPermission("admin")) return;
-
-        String message = String.join(" ", args);
-        this.getAppliance().sendMessage(this.getPlayer(), message);
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/chatMute/ChatMute.java

@@ -1,44 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.tooling.chatMute;
-
-import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
-import org.bukkit.NamespacedKey;
-import org.bukkit.entity.Player;
-import org.bukkit.event.Listener;
-import org.bukkit.persistence.PersistentDataContainer;
-import org.bukkit.persistence.PersistentDataType;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-import java.util.Locale;
-import java.util.Objects;
-
-public class ChatMute extends Appliance {
-    private static final String namespace = ChatMute.class.getSimpleName().toLowerCase(Locale.ROOT);
-    public static NamespacedKey mutedUntilKey = new NamespacedKey(namespace, "mutedUntilMillis".toLowerCase());
-
-    public void mutePlayer(Player player, int durationHours) {
-        PersistentDataContainer container = player.getPersistentDataContainer();
-        long mutedUntil = System.currentTimeMillis() + (long) durationHours * 60 * 60 * 1000;
-        container.set(ChatMute.mutedUntilKey, PersistentDataType.LONG, mutedUntil);
-    }
-
-    public @Nullable Long muteStatus(Player player) {
-        PersistentDataContainer container = player.getPersistentDataContainer();
-        if(!container.has(mutedUntilKey)) return null;
-        long mutedUntil = Objects.requireNonNull(container.get(mutedUntilKey, PersistentDataType.LONG));
-        if(mutedUntil < System.currentTimeMillis()) return null;
-        return mutedUntil;
-    }
-
-    @Override
-    protected @NotNull List<ApplianceCommand<?>> commands() {
-        return List.of(new MuteCommand());
-    }
-
-    @Override
-    protected @NotNull List<Listener> listeners() {
-        return List.of(new ChatMuteListener());
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/chatMute/ChatMuteListener.java

@@ -1,25 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.tooling.chatMute;
-
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
-import eu.mhsl.craftattack.spawn.core.util.text.DataSizeConverter;
-import io.papermc.paper.event.player.AsyncChatEvent;
-import net.kyori.adventure.text.Component;
-import net.kyori.adventure.text.format.NamedTextColor;
-import org.bukkit.event.EventHandler;
-import org.jetbrains.annotations.Nullable;
-
-class ChatMuteListener extends ApplianceListener<ChatMute> {
-    @EventHandler
-    public void onChat(AsyncChatEvent event) {
-        @Nullable Long muteDuration = this.getAppliance().muteStatus(event.getPlayer());
-        if(muteDuration == null) return;
-        event.setCancelled(true);
-        event.getPlayer().sendMessage(Component.text(
-            String.format(
-                "Du bist für %s gestummt!",
-                DataSizeConverter.formatSecondsToHumanReadable((int) ((muteDuration - System.currentTimeMillis()) / 1000))
-            ),
-            NamedTextColor.RED
-        ));
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/chatMute/MuteCommand.java

@@ -1,35 +0,0 @@
-package eu.mhsl.craftattack.spawn.common.appliances.tooling.chatMute;
-
-import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
-import org.bukkit.Bukkit;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-import java.util.Objects;
-
-class MuteCommand extends ApplianceCommand<ChatMute> {
-    public MuteCommand() {
-        super("mute");
-    }
-
-    @Override
-    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) throws Exception {
-        if(args.length < 2) throw new Error("Syntax: mute <player> <duration in hours>");
-        Player player = Objects.requireNonNull(Bukkit.getPlayer(args[0]));
-        int durationInHours = Integer.parseInt(args[1]);
-        this.getAppliance().mutePlayer(player, durationInHours);
-        sender.sendMessage(String.format("%s wurde für %d Stunden gestummt!", player.getName(), durationInHours));
-    }
-
-    @Override
-    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
-        if(args.length == 2) {
-            return List.of("1", "2", "4", "8", "24", "48");
-        }
-        return null;
-    }
-}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/deviceFingerprinting/DeviceFingerprinting.java

@@ -0,0 +1,177 @@
+package eu.mhsl.craftattack.spawn.common.appliances.tooling.deviceFingerprinting;
+
+import com.google.common.reflect.TypeToken;
+import com.google.gson.Gson;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.api.server.HttpServer;
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import net.kyori.adventure.resource.ResourcePackInfo;
+import net.kyori.adventure.resource.ResourcePackRequest;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerResourcePackStatusEvent;
+import org.jetbrains.annotations.NotNull;
+import spark.Response;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.lang.reflect.Type;
+import java.net.URI;
+import java.util.*;
+
+@Appliance.Flags(enabled = false)
+public class DeviceFingerprinting extends Appliance {
+    public record PackInfo(@NotNull String url, @NotNull UUID uuid, @NotNull String hash) {
+        private static final String failingUrl = "http://127.0.0.1:0";
+        public PackInfo asFailing() {
+            return new PackInfo(failingUrl, this.uuid, this.hash);
+        }
+    }
+
+    public enum PackStatus {
+        UNCACHED,
+        CACHED,
+        INVALID;
+
+        public static PackStatus fromBukkitStatus(PlayerResourcePackStatusEvent.Status status) {
+            return switch(status) {
+                case DISCARDED -> CACHED;
+                case FAILED_DOWNLOAD -> UNCACHED;
+                default -> INVALID;
+            };
+        }
+    }
+
+    public enum PlayerStatus {
+        PREPARATION,
+        TESTING,
+        FINISHED,
+        NEW
+    }
+
+    private List<PackInfo> packs;
+    private final Map<Player, FingerprintData> fingerprints = new WeakHashMap<>();
+    private final UUID basePackId = UUID.randomUUID();
+
+    @Override
+    public void onEnable() {
+        this.packs = this.readPacksFromConfig();
+    }
+
+    public void startFingerprinting(Player player) {
+        this.fingerprints.put(player, FingerprintData.create(player));
+        Main.logger().info(String.format("Sending base ressource-pack with id '%s' to '%s'%n", this.basePackId, player.getName()));
+        this.sendPack(player, new PackInfo("http://localhost:8080/api/devicefingerprinting/base.zip", this.basePackId, "3296e8bdd30b4f7cffd11c780a1dc70da2948e71"));
+    }
+
+    public void onPackUpdate(Player player, UUID packId, PlayerResourcePackStatusEvent.Status status) {
+        if(!this.fingerprints.containsKey(player)) return;
+        FingerprintData playerFingerprint = this.fingerprints.get(player);
+        if(!playerFingerprint.isInTestingOrPreparation()) return;
+
+        if(packId.equals(this.basePackId)) {
+            Main.logger().info(String.format("Base pack for '%s' updated: '%s'", player.getName(), status));
+
+            if(status != PlayerResourcePackStatusEvent.Status.ACCEPTED) return;
+            Main.logger().info(String.format("Base pack loaded successfully, sending now all packs to '%s'...", player.getName()));
+            playerFingerprint.setTesting();
+            this.packs.forEach(pack -> this.sendPack(player, pack.asFailing()));
+            return;
+        }
+
+        PackInfo pack = this.packs.stream()
+            .filter(packInfo -> Objects.equals(packInfo.uuid, packId))
+            .findAny()
+            .orElse(null);
+        if(pack == null) return;
+        int packIndex = this.packs.indexOf(pack);
+
+        List<PackStatus> pendingPacks = playerFingerprint.getPendingPacks();
+        PackStatus newPackStatus = PackStatus.fromBukkitStatus(status);
+        if(newPackStatus == PackStatus.INVALID) return;
+        pendingPacks.set(packIndex, newPackStatus);
+
+        playerFingerprint.updateFingerprint();
+        if(Objects.requireNonNull(playerFingerprint.getStatus()) == PlayerStatus.NEW) {
+            Main.logger().info(String.format("Sending fingerprint packs to Player '%s', as it is a unseen Player!", player.getName()));
+            this.sendNewFingerprint(player, Objects.requireNonNull(playerFingerprint.getFingerPrint()));
+        }
+    }
+
+    private void sendNewFingerprint(Player player, long fingerprintId) {
+        for (int i = 0; i < this.packs.size(); i++) {
+            if ((fingerprintId & (1L << i)) != 0) {
+                PackInfo pack = this.packs.get(i);
+                this.sendPack(player, pack);
+            }
+        }
+    }
+
+    public void sendPack(Player player, PackInfo pack) {
+        player.sendResourcePacks(
+            ResourcePackRequest.resourcePackRequest()
+                .required(true)
+                .packs(ResourcePackInfo.resourcePackInfo(pack.uuid, URI.create(pack.url), pack.hash))
+        );
+    }
+
+    private List<DeviceFingerprinting.PackInfo> readPacksFromConfig() {
+        try (InputStreamReader reader = new InputStreamReader(Objects.requireNonNull(Main.class.getResourceAsStream("/deviceFingerprinting/packs.json")))) {
+            Type packListType = new TypeToken<List<DeviceFingerprinting.PackInfo>>(){}.getType();
+            List<DeviceFingerprinting.PackInfo> packs = new Gson().fromJson(reader, packListType);
+            if (packs.isEmpty()) throw new IllegalStateException("No resource packs found in packs.json.");
+            return packs;
+        } catch (IOException e) {
+            throw new IllegalStateException("Failed to parse packs.json.", e);
+        }
+    }
+
+    @Override
+    public void httpApi(HttpServer.ApiBuilder apiBuilder) {
+        apiBuilder.rawGet(
+            "base.zip",
+            (request, response) -> this.servePack("base.zip", response)
+        );
+
+        for(int i = 0; i < this.packs.size(); i++) {
+            int packIndex = i;
+            apiBuilder.rawGet(
+                String.format("packs/%d", i),
+                (request, response) -> this.servePack(String.valueOf(packIndex), response)
+            );
+        }
+    }
+
+    private Object servePack(String name, Response response) {
+        try {
+            String resourcePath = String.format("/deviceFingerprinting/packs/%s", name);
+            var inputStream = Main.class.getResourceAsStream(resourcePath);
+
+            if (inputStream == null) {
+                throw new IllegalStateException("Pack file not found: " + resourcePath);
+            }
+
+            response.header("Content-Type", "application/zip");
+            response.header("Content-Disposition", String.format("attachment; filename=\"pack-%s.zip\"", name));
+
+            var outputStream = response.raw().getOutputStream();
+            inputStream.transferTo(outputStream);
+            outputStream.close();
+
+            return HttpServer.nothing;
+        } catch (IOException e) {
+            throw new RuntimeException(String.format("Failed to serve pack '%s'", name), e);
+        }
+    }
+
+    public List<PackInfo> getPacks() {
+        return this.packs;
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(
+            new PlayerJoinListener()
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/deviceFingerprinting/FingerprintData.java

@@ -0,0 +1,91 @@
+package eu.mhsl.craftattack.spawn.common.appliances.tooling.deviceFingerprinting;
+
+import eu.mhsl.craftattack.spawn.core.Main;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Random;
+
+class FingerprintData {
+    public final Player player;
+    private DeviceFingerprinting.PlayerStatus status;
+    private @Nullable Long fingerPrint;
+    private final List<DeviceFingerprinting.PackStatus> pendingPacks;
+    int packCount = Main.instance().getAppliance(DeviceFingerprinting.class).getPacks().size();
+
+    private FingerprintData(Player player) {
+        this.player = player;
+        this.status = DeviceFingerprinting.PlayerStatus.PREPARATION;
+        this.fingerPrint = null;
+        this.pendingPacks = Arrays.asList(new DeviceFingerprinting.PackStatus[this.packCount]);
+    }
+
+    public static FingerprintData create(Player player) {
+        return new FingerprintData(player);
+    }
+
+    public void setTesting() {
+        this.status = DeviceFingerprinting.PlayerStatus.TESTING;
+    }
+
+    public void updateFingerprint() {
+        long fingerPrint = 0;
+        for (int i = 0; i < this.pendingPacks.size(); i++) {
+            var status = this.pendingPacks.get(i);
+            if(status == null) return;
+            switch (status) {
+                case CACHED:
+                    fingerPrint |= 1L << i;
+                    break;
+                case UNCACHED:
+                    break;
+                default:
+                    return;
+            }
+        }
+
+        if(fingerPrint == 0) {
+            this.status = DeviceFingerprinting.PlayerStatus.NEW;
+            this.fingerPrint = this.createNewFingerprint();
+            Main.logger().info(String.format("Player %s's was marked as a new Player!", this.player.getName()));
+        } else {
+            this.status = DeviceFingerprinting.PlayerStatus.FINISHED;
+            this.fingerPrint = fingerPrint;
+        }
+
+        Main.logger().info(String.format("Player %s's fingerprint is '%s'", this.player.getName(), fingerPrint));
+    }
+
+    private long createNewFingerprint() {
+        long id = 0;
+        Random random = new Random();
+        for (int i = 0; i < this.packCount / 2; i++) {
+            while (true) {
+                int bitIndex = random.nextInt(this.packCount);
+                if ((id & (1L << bitIndex)) == 0) {
+                    id |= 1L << bitIndex;
+                    break;
+                }
+            }
+        }
+        return id;
+    }
+
+    public List<DeviceFingerprinting.PackStatus> getPendingPacks() {
+        return this.pendingPacks;
+    }
+
+    public DeviceFingerprinting.PlayerStatus getStatus() {
+        return this.status;
+    }
+
+    public @Nullable Long getFingerPrint() {
+        return this.fingerPrint;
+    }
+
+    public boolean isInTestingOrPreparation() {
+        return this.status == DeviceFingerprinting.PlayerStatus.TESTING || this.status == DeviceFingerprinting.PlayerStatus.PREPARATION;
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/deviceFingerprinting/PlayerJoinListener.java

@@ -0,0 +1,22 @@
+package eu.mhsl.craftattack.spawn.common.appliances.tooling.deviceFingerprinting;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerResourcePackStatusEvent;
+
+class PlayerJoinListener extends ApplianceListener<DeviceFingerprinting> {
+    @EventHandler
+    public void onJoin(PlayerJoinEvent event) {
+        this.getAppliance().startFingerprinting(event.getPlayer());
+    }
+
+    @EventHandler
+    public void onResourcePackEvent(PlayerResourcePackStatusEvent event) {
+        this.getAppliance().onPackUpdate(
+            event.getPlayer(),
+            event.getID(),
+            event.getStatus()
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/kick/Kick.java

@@ -1,9 +1,14 @@
 package eu.mhsl.craftattack.spawn.common.appliances.tooling.kick;
 
+import eu.mhsl.craftattack.spawn.core.Main;
 import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
 import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
+import eu.mhsl.craftattack.spawn.core.util.entity.PlayerUtils;
 import eu.mhsl.craftattack.spawn.core.util.text.DisconnectInfo;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.util.Ticks;
 import org.bukkit.Bukkit;
+import org.bukkit.Material;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -25,9 +30,36 @@ public class Kick extends Appliance {
         ).applyKick(player);
     }
 
+    public void unsuspectedKick(@NotNull String playerName) {
+        Player player = Bukkit.getPlayer(playerName);
+
+        if(player == null)
+            throw new ApplianceCommand.Error("Player not found");
+
+        String material = Material.values()[(int)(Math.random() * Material.values().length)].name();
+        player.kick(Component.text("java.lang.IllegalStateException: Failed to create model for minecraft:%s".formatted(material)));
+    }
+
+    public void crashKick(@NotNull String playerName) {
+        Player player = Bukkit.getPlayer(playerName);
+
+        if(player == null)
+            throw new ApplianceCommand.Error("Player not found");
+
+        Bukkit.getScheduler().runTaskAsynchronously(Main.instance(), () -> {
+            PlayerUtils.sendCube(player, 100, Material.ENCHANTING_TABLE.createBlockData());
+            PlayerUtils.sendCube(player, 5, Material.DIRT.createBlockData());
+        });
+        Bukkit.getScheduler().runTaskLater(Main.instance(), () -> player.kick(Component.empty()), Ticks.TICKS_PER_SECOND * 15);
+    }
+
     @Override
     @NotNull
     protected List<ApplianceCommand<?>> commands() {
-        return List.of(new KickCommand());
+        return List.of(
+            new KickCommand(),
+            new KickUnsuspectedCommand(),
+            new KickCrashCommand()
+        );
     }
 }

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/kick/KickCrashCommand.java

@@ -0,0 +1,31 @@
+package eu.mhsl.craftattack.spawn.common.appliances.tooling.kick;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+public class KickCrashCommand extends ApplianceCommand<Kick> {
+    public KickCrashCommand() {
+        super("kickCrash");
+    }
+
+    @Override
+    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) throws Exception {
+        if(args.length < 1) throw new Error("Es muss ein Spielername angegeben werden!");
+        this.getAppliance().crashKick(args[0]);
+    }
+
+    @Override
+    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        return super.tabCompleteReducer(
+            Bukkit.getOnlinePlayers().stream().map(Player::getName).toList(),
+            args
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/kick/KickUnsuspectedCommand.java

@@ -0,0 +1,31 @@
+package eu.mhsl.craftattack.spawn.common.appliances.tooling.kick;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceCommand;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+public class KickUnsuspectedCommand extends ApplianceCommand<Kick> {
+    public KickUnsuspectedCommand() {
+        super("kickUnsuspected");
+    }
+
+    @Override
+    protected void execute(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) throws Exception {
+        if(args.length < 1) throw new Error("Es muss ein Spielername angegeben werden!");
+        this.getAppliance().unsuspectedKick(args[0]);
+    }
+
+    @Override
+    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        return super.tabCompleteReducer(
+            Bukkit.getOnlinePlayers().stream().map(Player::getName).toList(),
+            args
+        );
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/loginLog/LoginAttempt.java

@@ -0,0 +1,32 @@
+package eu.mhsl.craftattack.spawn.common.appliances.tooling.loginLog;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.net.InetAddress;
+import java.time.Instant;
+import java.util.UUID;
+
+record LoginAttempt(
+    @NotNull Instant at,
+    @NotNull UUID uuid,
+    @NotNull String name,
+    @NotNull String ip,
+    boolean bedrock,
+    @NotNull String stage,
+    @NotNull String result,
+    @Nullable String reason
+) {
+    static final String STAGE_PRE_LOGIN = "PRE_LOGIN";
+    static final String STAGE_LOGIN = "LOGIN";
+    static final String STAGE_WEBSITE = "WEBSITE";
+    static final String RESULT_ABORTED = "ABORTED";
+
+    static String ipOf(@Nullable InetAddress address) {
+        return address == null ? "unknown" : address.getHostAddress();
+    }
+
+    LoginAttempt withOutcome(@NotNull String stage, @NotNull String result, @Nullable String reason) {
+        return new LoginAttempt(this.at, this.uuid, this.name, this.ip, this.bedrock, stage, result, reason);
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/loginLog/LoginLog.java

@@ -0,0 +1,196 @@
+package eu.mhsl.craftattack.spawn.common.appliances.tooling.loginLog;
+
+import com.google.common.net.InetAddresses;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.api.server.HttpServer;
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import eu.mhsl.craftattack.spawn.core.database.Database;
+import eu.mhsl.craftattack.spawn.core.event.LoginAttemptRecordedEvent;
+import eu.mhsl.craftattack.spawn.core.event.SpawnEvent;
+import eu.mhsl.craftattack.spawn.core.util.network.Networks;
+import eu.mhsl.craftattack.spawn.core.util.server.Floodgate;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
+import org.bukkit.Bukkit;
+import org.bukkit.event.Listener;
+import org.bukkit.scheduler.BukkitTask;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.net.InetAddress;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Records every login attempt (allowed or not) with its IP address in the table login_attempts
+ * (schema: resources/migrations/loginLog). Basis for detecting ban evasion.
+ * After each insert a LoginAttemptRecordedEvent is fired on the database thread.
+ * The website reports signups and logins of its users via POST /api/loginlog/website.
+ * Never blocks or delays a login: writes run on the database thread, failures are only logged.
+ */
+public class LoginLog extends Appliance {
+    private static final int MAX_REASON_LENGTH = 255;
+    private static final Duration PENDING_TIMEOUT = Duration.ofSeconds(60);
+    private static final long TICKS_PER_MINUTE = 20L * 60;
+
+    private final Map<UUID, LoginAttempt> pendingAttempts = new ConcurrentHashMap<>();
+    private final List<BukkitTask> tasks = new ArrayList<>();
+    private Database database;
+    private int retentionMonths;
+
+    public LoginLog() {
+        super("loginLog");
+    }
+
+    @Override
+    public void onEnable() {
+        this.database = Main.instance().getDatabase();
+        if(!this.database.isAvailable()) {
+            Main.logger().warning("LoginLog: no database configured, login attempts are not recorded");
+            return;
+        }
+        this.retentionMonths = this.localConfig().getInt("retentionMonths", 16);
+
+        this.tasks.add(Bukkit.getScheduler().runTaskTimerAsynchronously(
+            Main.instance(), this::flushStaleAttempts, TICKS_PER_MINUTE, TICKS_PER_MINUTE
+        ));
+        this.tasks.add(Bukkit.getScheduler().runTaskTimerAsynchronously(
+            Main.instance(), this::deleteExpired, TICKS_PER_MINUTE, TICKS_PER_MINUTE * 60 * 24
+        ));
+    }
+
+    @Override
+    public void onDisable() {
+        this.tasks.forEach(BukkitTask::cancel);
+    }
+
+    void onPreLogin(UUID uuid, String name, @Nullable InetAddress address, String result, @Nullable Component kickMessage) {
+        if(!this.database.isAvailable()) return;
+        LoginAttempt attempt = new LoginAttempt(
+            Instant.now(), uuid, name, LoginAttempt.ipOf(address), Floodgate.isFloodgateUuid(uuid),
+            LoginAttempt.STAGE_PRE_LOGIN, result, plainText(kickMessage)
+        );
+
+        // allowed attempts are written after the login event, so they carry the final result
+        if(kickMessage == null) this.pendingAttempts.put(uuid, attempt);
+        else this.write(attempt);
+    }
+
+    void onLogin(UUID uuid, String name, @Nullable InetAddress address, String result, @Nullable Component kickMessage) {
+        if(!this.database.isAvailable()) return;
+        LoginAttempt pending = this.pendingAttempts.remove(uuid);
+        LoginAttempt attempt = pending != null
+            ? pending
+            : new LoginAttempt(Instant.now(), uuid, name, LoginAttempt.ipOf(address), Floodgate.isFloodgateUuid(uuid), "", "", null);
+
+        this.write(attempt.withOutcome(LoginAttempt.STAGE_LOGIN, result, plainText(kickMessage)));
+    }
+
+    private void flushStaleAttempts() {
+        Instant threshold = Instant.now().minus(PENDING_TIMEOUT);
+        this.pendingAttempts.values().removeIf(attempt -> {
+            if(attempt.at().isAfter(threshold)) return false;
+            this.write(attempt.withOutcome(LoginAttempt.STAGE_PRE_LOGIN, LoginAttempt.RESULT_ABORTED, null));
+            return true;
+        });
+    }
+
+    private void write(LoginAttempt attempt) {
+        String network = Networks.networkOf(attempt.ip());
+        String sql = "INSERT INTO login_attempts (at, uuid, name, ip, network, bedrock, stage, result, reason) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)";
+        this.database.execute("recording login attempt of " + attempt.name(), connection -> {
+            long id;
+            try(PreparedStatement statement = connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+                statement.setObject(1, LocalDateTime.ofInstant(attempt.at(), ZoneOffset.UTC));
+                statement.setString(2, attempt.uuid().toString());
+                statement.setString(3, attempt.name());
+                statement.setString(4, attempt.ip());
+                statement.setString(5, network);
+                statement.setBoolean(6, attempt.bedrock());
+                statement.setString(7, attempt.stage());
+                statement.setString(8, attempt.result());
+                statement.setString(9, attempt.reason());
+                statement.executeUpdate();
+                try(ResultSet keys = statement.getGeneratedKeys()) {
+                    if(!keys.next()) return;
+                    id = keys.getLong(1);
+                }
+            }
+            SpawnEvent.call(new LoginAttemptRecordedEvent(new LoginAttemptRecordedEvent.RecordedAttempt(
+                id, attempt.at(), attempt.uuid(), attempt.name(), network, attempt.stage(), attempt.result()
+            )));
+        });
+    }
+
+    private void deleteExpired() {
+        String sql = "DELETE FROM login_attempts WHERE at < UTC_TIMESTAMP() - INTERVAL ? MONTH";
+        this.database.execute("deleting expired login attempts", connection -> {
+            try(PreparedStatement statement = connection.prepareStatement(sql)) {
+                statement.setInt(1, this.retentionMonths);
+                int deleted = statement.executeUpdate();
+                if(deleted > 0) Main.logger().info(String.format("LoginLog: deleted %d expired login attempts", deleted));
+            }
+        });
+    }
+
+    private record WebsiteEvent(String event, String uuid, String username, String ip) {
+    }
+
+    private void recordWebsiteEvent(WebsiteEvent request) {
+        if(request == null) throw new IllegalArgumentException("Request body missing");
+        if(!this.database.isAvailable()) throw new IllegalStateException("No database configured");
+
+        String event = request.event() == null ? "" : request.event().trim().toUpperCase(Locale.ROOT);
+        if(!event.equals("SIGNUP") && !event.equals("LOGIN"))
+            throw new IllegalArgumentException("Field 'event' must be 'signup' or 'login'");
+        if(request.uuid() == null || request.uuid().isBlank())
+            throw new IllegalArgumentException("Field 'uuid' is required");
+        UUID uuid;
+        try {
+            uuid = UUID.fromString(request.uuid().trim());
+        } catch(IllegalArgumentException e) {
+            throw new IllegalArgumentException("Field 'uuid' is not a valid UUID");
+        }
+        if(request.username() == null || request.username().isBlank())
+            throw new IllegalArgumentException("Field 'username' is required");
+        if(request.ip() == null || !InetAddresses.isInetAddress(request.ip().trim()))
+            throw new IllegalArgumentException("Field 'ip' is not a valid IP address");
+
+        this.write(new LoginAttempt(
+            Instant.now(), uuid, request.username().trim(), request.ip().trim(), Floodgate.isFloodgateUuid(uuid),
+            LoginAttempt.STAGE_WEBSITE, event, null
+        ));
+    }
+
+    @Override
+    public void httpApi(HttpServer.ApiBuilder apiBuilder) {
+        apiBuilder.post("website", WebsiteEvent.class, (request, original) -> {
+            this.recordWebsiteEvent(request);
+            return HttpServer.nothing;
+        });
+    }
+
+    private static @Nullable String plainText(@Nullable Component component) {
+        if(component == null) return null;
+        String text = PlainTextComponentSerializer.plainText().serialize(component)
+            .strip()
+            .replaceAll("\\s*\\n\\s*", " | ");
+        return text.length() > MAX_REASON_LENGTH ? text.substring(0, MAX_REASON_LENGTH) : text;
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(new LoginLogListener());
+    }
+}

common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/tooling/loginLog/LoginLogListener.java

@@ -0,0 +1,34 @@
+package eu.mhsl.craftattack.spawn.common.appliances.tooling.loginLog;
+
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.player.AsyncPlayerPreLoginEvent;
+import org.bukkit.event.player.PlayerLoginEvent;
+
+/**
+ * Listens on MONITOR priority, so the final result of all other checks (whitelist, bans, maintenance, ...) is recorded.
+ */
+class LoginLogListener extends ApplianceListener<LoginLog> {
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onPreLogin(AsyncPlayerPreLoginEvent event) {
+        this.getAppliance().onPreLogin(
+            event.getUniqueId(),
+            event.getName(),
+            event.getAddress(),
+            event.getLoginResult().name(),
+            event.getLoginResult() == AsyncPlayerPreLoginEvent.Result.ALLOWED ? null : event.kickMessage()
+        );
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onLogin(PlayerLoginEvent event) {
+        this.getAppliance().onLogin(
+            event.getPlayer().getUniqueId(),
+            event.getPlayer().getName(),
+            event.getAddress(),
+            event.getResult().name(),
+            event.getResult() == PlayerLoginEvent.Result.ALLOWED ? null : event.kickMessage()
+        );
+    }
+}

common/src/main/resources/deviceFingerprinting/README.md

@@ -0,0 +1,5 @@
+## Files originally from "TrackPack"
+https://github.com/ALaggyDev/TrackPack/blob/main/README.md
+
+
+Discovered by: [Laggy](https://github.com/ALaggyDev/) and [NikOverflow](https://github.com/NikOverflow)

common/src/main/resources/deviceFingerprinting/gen_packs.py

@@ -0,0 +1,33 @@
+import zipfile
+import hashlib
+import uuid
+import json
+
+SERVER_URL = "http://localhost:8080/api/devicefingerprinting"
+packs = []
+
+def file_sha1(path):
+    h = hashlib.sha1()
+    with open(path, "rb") as f:
+        for chunk in iter(lambda: f.read(8192), b""):
+            h.update(chunk)
+    return h.hexdigest()
+
+for i in range(0, 24):
+    path = f"packs/{i}"
+
+    with zipfile.ZipFile(path, mode="w") as zf:
+        zf.writestr(
+            "pack.mcmeta",
+            '{"pack":{"pack_format":22,"supported_formats":[22,1000],"description":"pack ' + str(i) + '"}}',
+        )
+
+    hash = file_sha1(path)
+    packs.append({
+        "url": f"{SERVER_URL}/packs/{i}",
+        "uuid": str(uuid.uuid4()),
+        "hash": hash
+    })
+
+with open("packs.json", "w") as f:
+    json.dump(packs, f, indent=4)

common/src/main/resources/deviceFingerprinting/packs.json

@@ -0,0 +1,122 @@
+[
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/0",
+        "uuid": "b35f6e2f-1b50-4493-85be-fb18bd90f9bb",
+        "hash": "7a39af839ea6484431f7b707759546bea991d435"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/1",
+        "uuid": "71095b62-d5ef-4ab2-ba3b-3c1b403f5e34",
+        "hash": "a9192ee73df1c5cff2c188fac6e9e638a1e7b6ce"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/2",
+        "uuid": "a4dba0a2-f8f2-4a81-bbb2-a9a818820330",
+        "hash": "6b85b0eb54865dae70bbda89746d83717dc2a214"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/3",
+        "uuid": "79fa2dc4-8c84-45fc-a09f-d89906f0d900",
+        "hash": "c7abf7a316f7e8c98985e8317a8b649e824e9f79"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/4",
+        "uuid": "15702c9b-a22b-426d-b48a-3d65b0368e9a",
+        "hash": "10cd0e2c46f192deb87ac75c149827d44a713017"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/5",
+        "uuid": "3d702d41-8e2f-4920-8dd0-1fd2146da9fb",
+        "hash": "8ad517d259e800b88a38ff00ee6721d5656822f2"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/6",
+        "uuid": "c20a2e47-ef43-49da-a80d-adf238df3695",
+        "hash": "798677405a4fd678892e1cf55585c8c91f82e1e2"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/7",
+        "uuid": "7ce51b81-1263-4919-9f4e-bb749ffe6e2e",
+        "hash": "af473b8eb7572f35d307bede5f2e20f263c0d804"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/8",
+        "uuid": "0c70d586-fe48-4ffc-86b0-6b9ec3bfe045",
+        "hash": "2fb698ff88f2436637641f3b2e6792201feb5144"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/9",
+        "uuid": "c7af75a8-0b72-495d-a0ff-c1c40e229c13",
+        "hash": "cf660460798eecf451d639873cc1fedc4661db1b"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/10",
+        "uuid": "248dbce6-4b2a-44b5-b038-8d718b0ced99",
+        "hash": "a8ebe708d0f3747c76e4e5e68db5dcb561922706"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/11",
+        "uuid": "10979174-cb02-40eb-a754-275551ad608d",
+        "hash": "54961b48db1582a1a0981c8cc9be5ae0f3122cf3"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/12",
+        "uuid": "a361cfa7-674c-4493-a4cf-4baff851f276",
+        "hash": "013719dc8da79c96b45a1c5319c20bffe1a56cc9"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/13",
+        "uuid": "24b39bdb-ada9-40ec-9e3a-132c74b81dc6",
+        "hash": "206898c6b6600d2648b2d79c61fc6255b19587d9"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/14",
+        "uuid": "158fc5b4-be2c-4f7a-98cb-af5993adcc90",
+        "hash": "061b266a7c526fb3a3152a4ea70ca5592e0b503c"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/15",
+        "uuid": "4f9097a7-be02-48ad-919c-f292307f8490",
+        "hash": "45a667a0fe06246defabca14ef1271fb6db5a1ac"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/16",
+        "uuid": "3ce31e60-7e8a-4fb1-8c6d-da9065bea798",
+        "hash": "75bb12e46203d49e89aa9a826d267552372758bc"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/17",
+        "uuid": "cd978e5c-3de0-4ada-8ec5-3a88a305eec6",
+        "hash": "5b20261f7be03e83e9c52307f1408b0c5e58358c"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/18",
+        "uuid": "75001e58-3999-4779-a1d1-43ab161770ce",
+        "hash": "544420cffb6c17113c06fb49eeba892c208719d3"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/19",
+        "uuid": "6a7005a9-c2ca-476d-9a12-07d120ee121a",
+        "hash": "fcc066a4d3193b60b102e3d906ad8dc0b0fcf65b"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/20",
+        "uuid": "521c0d84-d82e-49ef-b096-d9b90f15aa19",
+        "hash": "4545835983ec7f07d02675a69181a80dc396f038"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/21",
+        "uuid": "c1b590c5-43fc-41e3-83c0-47f35b14f845",
+        "hash": "8d4c670eaefc0482734e839b72758226dde13bc3"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/22",
+        "uuid": "43958a18-c087-4f2b-a6ea-066231606eb1",
+        "hash": "004282602f7bdbb7cd7724f23aae23876f224092"
+    },
+    {
+        "url": "http://localhost:8080/api/devicefingerprinting/packs/23",
+        "uuid": "4b91ac81-9de4-4c2b-a876-47e621496d10",
+        "hash": "dae68eae109e08ea4c4c943905502eb331939f64"
+    }
+]

common/src/main/resources/deviceFingerprinting/packs/.gitignore

@@ -0,0 +1 @@
+!base.zip