feat(succession): transfer tyrant reign on death

design/log.md

@@ -6,6 +6,28 @@ description: Chronological record of material decisions affecting the Spigot Tyr
 
 # Spigot Tyrant Design Log
 
+## 2026-08-14 — Tyrant succession completed
+
+- Completed US-002 with player-killer transfer, recent-player environmental succession, former-holder avoidance, pending offline confirmation, and distinct replacement Vigilante selection.
+- Tyrant death clears all classes, Followers, cooldowns, item readiness, purchases, levels, and choices before granting the successor one starting choice.
+- Added death-event integration, server announcements, and a scoreboard-team-backed red Tyrant name and glowing outline that is restored on login and removed on pause or shutdown.
+- Verified succession attribution, random exclusion, reign cleanup, role separation, death integration, and red presentation with the Gradle suite.
+
+## 2026-08-14 — Tyrant succession implementation started
+
+- US-002 begins with test-first killer and environmental succession, reign-wide cleanup, replacement Vigilante selection, and red Tyrant presentation.
+
+## 2026-08-14 — Administrative lifecycle completed
+
+- Completed US-001 with permission-gated `/tyrantadmin` start, status, pause, resume, and confirmed reset operations.
+- Initial Vigilantes may be assigned explicitly or selected among eligible recently active players, with offline selections persisted as pending confirmations.
+- Pause/resume preserves progression and assignments, shifts every cooldown, participation, inactivity, and pending-selection deadline, and invokes managed effect suppression/restoration.
+- Added detailed operator status output and verified lifecycle, timer shifting, permissions, confirmation safety, candidate filtering, metadata, and effect hooks with the Gradle suite.
+
+## 2026-08-14 — Administrative lifecycle implementation started
+
+- US-001 begins with test-first game start, pause/resume deadline freezing, permission-gated administration, inspection, and confirmed reset behavior.
+
 ## 2026-08-14 — Tyrant class assignment completed
 
 - Completed US-004 with `/tyrant assign <class> <player>`, purchased-class authorization, UUID state, one holder per class, and one Tyrant-side class per player.

design/user-stories/us-001-start-pause-and-administer.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-001: Start, pause, and administer the game"
 description: Give server operators safe control over the Tyrant game's lifecycle and state.
-status: backlog
+status: done
 ---
 
 # US-001: Start, pause, and administer the game
@@ -11,14 +11,14 @@ As a **server operator**, I want to start, pause, resume, and inspect the game s
 
 ## Acceptance criteria
 
-- [ ] An administrator can start the first game by assigning the initial Tyrant.
-- [ ] The administrator may assign the first Vigilante or allow random selection from eligible recently active players.
-- [ ] An administrator can pause and resume the game without deleting game state.
-- [ ] Pausing freezes progression, cooldowns, daily-use timers, inactivity checks, and pending-selection deadlines.
-- [ ] Role and class effects are suppressed while paused and restored when play resumes.
-- [ ] Administrative commands require the `spigottyrant.admin` permission, granted to server operators by default.
-- [ ] Administrators can inspect lifecycle state, roles, classes, Followers, purchases, levels, cooldowns, participation, and pending selections.
-- [ ] Destructive administrative operations require explicit confirmation.
+- [x] An administrator can start the first game by assigning the initial Tyrant.
+- [x] The administrator may assign the first Vigilante or allow random selection from eligible recently active players.
+- [x] An administrator can pause and resume the game without deleting game state.
+- [x] Pausing freezes progression, cooldowns, daily-use timers, inactivity checks, and pending-selection deadlines.
+- [x] Role and class effects are suppressed while paused and restored when play resumes.
+- [x] Administrative commands require the `spigottyrant.admin` permission, granted to server operators by default.
+- [x] Administrators can inspect lifecycle state, roles, classes, Followers, purchases, levels, cooldowns, participation, and pending selections.
+- [x] Destructive administrative operations require explicit confirmation.
 
 ## Related
 

design/user-stories/us-002-transfer-and-reset-tyrant.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-002: Transfer and reset the Tyrant role"
 description: End a Tyrant's reign cleanly and establish a valid successor after death.
-status: backlog
+status: done
 ---
 
 # US-002: Transfer and reset the Tyrant role
@@ -11,15 +11,15 @@ As a **player**, I want defeating the Tyrant to transfer power predictably so th
 
 ## Acceptance criteria
 
-- [ ] A player directly credited with killing the Tyrant becomes the new Tyrant.
-- [ ] A Tyrant death without a player killer selects an eligible opted-in player active within the preceding 24 hours at random.
-- [ ] The former Tyrant is excluded from random succession when another eligible candidate exists.
-- [ ] The former Tyrant's level, unlocks, unspent choices, and Tyrant ability cooldowns reset when the reign ends.
-- [ ] Every Assassin, Fixer, Tamer, Vigilante, and Follower assignment is cleared when the Tyrant dies.
-- [ ] A new Vigilante is selected under the normal candidate rules after succession.
-- [ ] The new Tyrant receives exactly one starting unlock choice.
-- [ ] The Tyrant's displayed name is red and the Tyrant has a red glowing outline while the game is running.
-- [ ] Succession cannot assign the same player as both Tyrant and Vigilante.
+- [x] A player directly credited with killing the Tyrant becomes the new Tyrant.
+- [x] A Tyrant death without a player killer selects an eligible opted-in player active within the preceding 24 hours at random.
+- [x] The former Tyrant is excluded from random succession when another eligible candidate exists.
+- [x] The former Tyrant's level, unlocks, unspent choices, and Tyrant ability cooldowns reset when the reign ends.
+- [x] Every Assassin, Fixer, Tamer, Vigilante, and Follower assignment is cleared when the Tyrant dies.
+- [x] A new Vigilante is selected under the normal candidate rules after succession.
+- [x] The new Tyrant receives exactly one starting unlock choice.
+- [x] The Tyrant's displayed name is red and the Tyrant has a red glowing outline while the game is running.
+- [x] Succession cannot assign the same player as both Tyrant and Vigilante.
 
 ## Related
 

src/main/java/games/dmg/spigottyrant/BukkitManagedRoleEffects.java

@@ -0,0 +1,28 @@
+package games.dmg.spigottyrant;
+
+public final class BukkitManagedRoleEffects implements ManagedRoleEffects {
+    private final TyrantStateManager stateManager;
+    private final TyrantPresentation presentation;
+
+    public BukkitManagedRoleEffects(
+        TyrantStateManager stateManager,
+        TyrantPresentation presentation
+    ) {
+        this.stateManager = stateManager;
+        this.presentation = presentation;
+    }
+
+    @Override
+    public void suppressAll() {
+        presentation.clear();
+    }
+
+    @Override
+    public void restoreAll() {
+        if (stateManager.game().lifecycle() == GameLifecycle.RUNNING) {
+            presentation.reconcile(stateManager.game().tyrantId());
+        } else {
+            presentation.clear();
+        }
+    }
+}

src/main/java/games/dmg/spigottyrant/BukkitTyrantPresentation.java

@@ -0,0 +1,55 @@
+package games.dmg.spigottyrant;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+import org.bukkit.ChatColor;
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+import org.bukkit.scoreboard.Scoreboard;
+import org.bukkit.scoreboard.ScoreboardManager;
+import org.bukkit.scoreboard.Team;
+
+public final class BukkitTyrantPresentation implements TyrantPresentation {
+    private static final String TEAM_NAME = "tyrant-red";
+    private final Server server;
+    private final Team team;
+    private Optional<UUID> presentedTyrant = Optional.empty();
+
+    public BukkitTyrantPresentation(Server server) {
+        this.server = server;
+        ScoreboardManager manager = Objects.requireNonNull(
+            server.getScoreboardManager(), "Scoreboard manager is unavailable"
+        );
+        Scoreboard scoreboard = manager.getMainScoreboard();
+        Team existing = scoreboard.getTeam(TEAM_NAME);
+        team = existing == null ? scoreboard.registerNewTeam(TEAM_NAME) : existing;
+        team.setColor(ChatColor.RED);
+    }
+
+    @Override
+    public void reconcile(Optional<UUID> tyrantId) {
+        clear();
+        presentedTyrant = tyrantId;
+        tyrantId.map(server::getPlayer).ifPresent(player -> {
+            team.addEntry(player.getName());
+            player.setGlowing(true);
+            player.setPlayerListName(ChatColor.RED + player.getName());
+            player.setDisplayName(ChatColor.RED + player.getName());
+        });
+    }
+
+    @Override
+    public void clear() {
+        presentedTyrant.map(server::getPlayer).ifPresent(player -> {
+            player.setGlowing(false);
+            player.setPlayerListName(player.getName());
+            player.setDisplayName(player.getName());
+        });
+        for (String entry : new HashSet<>(team.getEntries())) {
+            team.removeEntry(entry);
+        }
+        presentedTyrant = Optional.empty();
+    }
+}

src/main/java/games/dmg/spigottyrant/GameLifecycleService.java

@@ -0,0 +1,137 @@
+package games.dmg.spigottyrant;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.EnumMap;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+
+public final class GameLifecycleService {
+    public LifecycleState start(
+        PersistentState state,
+        UUID tyrantId,
+        Optional<UUID> vigilanteId,
+        Instant now
+    ) {
+        if (state.game().lifecycle() != GameLifecycle.UNSTARTED) {
+            throw new IllegalStateException("game has already been started");
+        }
+        if (vigilanteId.filter(tyrantId::equals).isPresent()) {
+            throw new IllegalArgumentException("Tyrant and Vigilante must be different players");
+        }
+        GameState game = new GameState(
+            GameLifecycle.RUNNING,
+            Optional.of(tyrantId),
+            vigilanteId,
+            Optional.empty(),
+            Optional.empty(),
+            Optional.empty(),
+            Duration.ZERO,
+            0,
+            1,
+            Set.of()
+        );
+        return new LifecycleState(game, state.players());
+    }
+
+    public LifecycleState pause(PersistentState state, Instant now) {
+        if (state.game().lifecycle() != GameLifecycle.RUNNING) {
+            throw new IllegalStateException("only a running game can be paused");
+        }
+        GameState current = state.game();
+        GameState paused = new GameState(
+            GameLifecycle.PAUSED,
+            current.tyrantId(),
+            current.vigilanteId(),
+            current.pendingTyrant(),
+            current.pendingVigilante(),
+            Optional.of(now),
+            current.accumulatedPausedTime(),
+            current.tyrantLevel(),
+            current.unspentChoices(),
+            current.purchases()
+        );
+        return new LifecycleState(paused, state.players());
+    }
+
+    public LifecycleState resume(PersistentState state, Instant now) {
+        GameState current = state.game();
+        if (current.lifecycle() != GameLifecycle.PAUSED || current.pausedAt().isEmpty()) {
+            throw new IllegalStateException("only a paused game can be resumed");
+        }
+        Instant pausedAt = current.pausedAt().orElseThrow();
+        Duration pausedFor = Duration.between(pausedAt, now);
+        if (pausedFor.isNegative()) {
+            throw new IllegalArgumentException("resume time must not precede pause time");
+        }
+        GameState resumed = new GameState(
+            GameLifecycle.RUNNING,
+            current.tyrantId(),
+            current.vigilanteId(),
+            shiftSelection(current.pendingTyrant(), pausedFor),
+            shiftSelection(current.pendingVigilante(), pausedFor),
+            Optional.empty(),
+            current.accumulatedPausedTime().plus(pausedFor),
+            current.tyrantLevel(),
+            current.unspentChoices(),
+            current.purchases()
+        );
+        Map<UUID, PlayerState> players = new HashMap<>();
+        for (PlayerState player : state.players().values()) {
+            players.put(player.playerId(), shift(player, pausedFor));
+        }
+        return new LifecycleState(resumed, players);
+    }
+
+    public LifecycleState reset(PersistentState state) {
+        Map<UUID, PlayerState> players = new HashMap<>();
+        for (PlayerState player : state.players().values()) {
+            players.put(player.playerId(), new PlayerState(
+                player.playerId(),
+                player.latestName(),
+                player.lastLogin(),
+                player.optedOutUntil(),
+                TyrantClass.NONE,
+                Optional.empty(),
+                Map.of(),
+                Set.of(),
+                player.capturedMobs()
+            ));
+        }
+        return new LifecycleState(GameState.empty(), players);
+    }
+
+    private static Optional<PendingSelection> shiftSelection(
+        Optional<PendingSelection> selection,
+        Duration pausedFor
+    ) {
+        return selection.map(value -> new PendingSelection(
+            value.candidateId(), value.expiresAt().plus(pausedFor)
+        ));
+    }
+
+    private static PlayerState shift(PlayerState player, Duration pausedFor) {
+        Map<Ability, Instant> cooldowns = new EnumMap<>(Ability.class);
+        player.cooldownEnds().forEach((ability, deadline) ->
+            cooldowns.put(ability, deadline.plus(pausedFor))
+        );
+        return new PlayerState(
+            player.playerId(),
+            player.latestName(),
+            shiftInstant(player.lastLogin(), pausedFor),
+            shiftInstant(player.optedOutUntil(), pausedFor),
+            player.tyrantClass(),
+            player.followerOf(),
+            cooldowns,
+            player.readyAbilityItems(),
+            player.capturedMobs()
+        );
+    }
+
+    private static Optional<Instant> shiftInstant(Optional<Instant> value, Duration duration) {
+        return value.map(instant -> instant.plus(duration));
+    }
+}

src/main/java/games/dmg/spigottyrant/LifecycleState.java

@@ -0,0 +1,14 @@
+package games.dmg.spigottyrant;
+
+import java.util.Map;
+import java.util.UUID;
+
+public record LifecycleState(GameState game, Map<UUID, PlayerState> players) {
+    public LifecycleState {
+        players = Map.copyOf(players);
+    }
+
+    public PersistentState asPersistentState() {
+        return new PersistentState(game, players);
+    }
+}

src/main/java/games/dmg/spigottyrant/ManagedRoleEffects.java

@@ -0,0 +1,7 @@
+package games.dmg.spigottyrant;
+
+public interface ManagedRoleEffects {
+    void suppressAll();
+
+    void restoreAll();
+}

src/main/java/games/dmg/spigottyrant/NoopManagedRoleEffects.java

@@ -0,0 +1,13 @@
+package games.dmg.spigottyrant;
+
+public final class NoopManagedRoleEffects implements ManagedRoleEffects {
+    @Override
+    public void suppressAll() {
+        // No managed effects exist until their corresponding abilities are unlocked.
+    }
+
+    @Override
+    public void restoreAll() {
+        // No managed effects exist until their corresponding abilities are unlocked.
+    }
+}

src/main/java/games/dmg/spigottyrant/PlayerJoinListener.java

@@ -8,10 +8,20 @@ import org.bukkit.event.player.PlayerJoinEvent;
 public final class PlayerJoinListener implements Listener {
     private final TyrantStateManager stateManager;
     private final Clock clock;
+    private final TyrantPresentation presentation;
 
     public PlayerJoinListener(TyrantStateManager stateManager, Clock clock) {
+        this(stateManager, clock, null);
+    }
+
+    public PlayerJoinListener(
+        TyrantStateManager stateManager,
+        Clock clock,
+        TyrantPresentation presentation
+    ) {
         this.stateManager = stateManager;
         this.clock = clock;
+        this.presentation = presentation;
     }
 
     @EventHandler
@@ -29,5 +39,11 @@ public final class PlayerJoinListener implements Listener {
         if (!reminder.isEmpty()) {
             event.getPlayer().sendMessage(reminder);
         }
+        if (presentation != null
+                && stateManager.game().lifecycle() == GameLifecycle.RUNNING
+                && stateManager.game().tyrantId()
+                    .filter(event.getPlayer().getUniqueId()::equals).isPresent()) {
+            presentation.reconcile(stateManager.game().tyrantId());
+        }
     }
 }

src/main/java/games/dmg/spigottyrant/RoleCandidateSelector.java

@@ -0,0 +1,47 @@
+package games.dmg.spigottyrant;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.random.RandomGenerator;
+
+public final class RoleCandidateSelector {
+    public Optional<UUID> select(
+        Map<UUID, PlayerState> players,
+        Set<UUID> excluded,
+        Optional<UUID> previousHolder,
+        Instant now,
+        Duration activityWindow,
+        RandomGenerator random
+    ) {
+        Instant cutoff = now.minus(activityWindow);
+        List<UUID> eligible = new ArrayList<>();
+        for (PlayerState player : players.values()) {
+            if (excluded.contains(player.playerId())) {
+                continue;
+            }
+            if (player.lastLogin().isEmpty()
+                    || player.lastLogin().orElseThrow().isBefore(cutoff)) {
+                continue;
+            }
+            if (player.optedOutUntil().filter(deadline -> deadline.isAfter(now)).isPresent()) {
+                continue;
+            }
+            eligible.add(player.playerId());
+        }
+        if (eligible.size() > 1) {
+            previousHolder.ifPresent(eligible::remove);
+        }
+        if (eligible.isEmpty()) {
+            return Optional.empty();
+        }
+        eligible.sort(Comparator.comparing(UUID::toString));
+        return Optional.of(eligible.get(random.nextInt(eligible.size())));
+    }
+}

src/main/java/games/dmg/spigottyrant/SpigotTyrantPlugin.java

@@ -10,6 +10,7 @@ import org.bukkit.plugin.java.JavaPlugin;
 public final class SpigotTyrantPlugin extends JavaPlugin {
     private PluginSettings settings;
     private TyrantStateManager stateManager;
+    private TyrantPresentation tyrantPresentation;
 
     @Override
     public void onEnable() {
@@ -27,10 +28,42 @@ public final class SpigotTyrantPlugin extends JavaPlugin {
             return;
         }
 
+        tyrantPresentation = new BukkitTyrantPresentation(getServer());
+        ManagedRoleEffects managedEffects = new BukkitManagedRoleEffects(
+            stateManager, tyrantPresentation
+        );
+        managedEffects.restoreAll();
         Objects.requireNonNull(getCommand("tyrant"), "Missing tyrant command metadata")
             .setExecutor(new TyrantCommand(stateManager, new TyrantProgressionService()));
+        Objects.requireNonNull(getCommand("tyrantadmin"), "Missing tyrantadmin metadata")
+            .setExecutor(new TyrantAdminCommand(
+                stateManager,
+                new GameLifecycleService(),
+                new BukkitOnlinePlayerDirectory(),
+                managedEffects,
+                Clock.systemUTC(),
+                new RoleCandidateSelector(),
+                settings.candidateActivityWindow(),
+                settings.pendingSelectionTimeout(),
+                java.util.random.RandomGenerator.getDefault()
+            ));
         getServer().getPluginManager().registerEvents(
-            new PlayerJoinListener(stateManager, Clock.systemUTC()),
+            new PlayerJoinListener(stateManager, Clock.systemUTC(), tyrantPresentation),
+            this
+        );
+        getServer().getPluginManager().registerEvents(
+            new TyrantDeathListener(
+                stateManager,
+                new TyrantSuccessionService(
+                    new RoleCandidateSelector(),
+                    settings.candidateActivityWindow(),
+                    settings.pendingSelectionTimeout(),
+                    java.util.random.RandomGenerator.getDefault()
+                ),
+                tyrantPresentation,
+                getServer(),
+                Clock.systemUTC()
+            ),
             this
         );
         getServer().getScheduler().runTaskTimer(this, stateManager::saveIfDirty, 600L, 600L);
@@ -39,6 +72,9 @@ public final class SpigotTyrantPlugin extends JavaPlugin {
 
     @Override
     public void onDisable() {
+        if (tyrantPresentation != null) {
+            tyrantPresentation.clear();
+        }
         if (stateManager != null) {
             stateManager.saveIfDirty();
         }

src/main/java/games/dmg/spigottyrant/TyrantAdminCommand.java

@@ -0,0 +1,209 @@
+package games.dmg.spigottyrant;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.util.Locale;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.random.RandomGenerator;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public final class TyrantAdminCommand implements CommandExecutor {
+    private static final String PERMISSION = "spigottyrant.admin";
+    private final TyrantStateManager stateManager;
+    private final GameLifecycleService lifecycle;
+    private final OnlinePlayerDirectory onlinePlayers;
+    private final ManagedRoleEffects effects;
+    private final Clock clock;
+    private final RoleCandidateSelector candidateSelector;
+    private final Duration activityWindow;
+    private final Duration pendingTimeout;
+    private final RandomGenerator random;
+
+    public TyrantAdminCommand(
+        TyrantStateManager stateManager,
+        GameLifecycleService lifecycle,
+        OnlinePlayerDirectory onlinePlayers,
+        ManagedRoleEffects effects,
+        Clock clock
+    ) {
+        this(
+            stateManager, lifecycle, onlinePlayers, effects, clock,
+            new RoleCandidateSelector(), Duration.ofHours(24), Duration.ofHours(24),
+            RandomGenerator.getDefault()
+        );
+    }
+
+    public TyrantAdminCommand(
+        TyrantStateManager stateManager,
+        GameLifecycleService lifecycle,
+        OnlinePlayerDirectory onlinePlayers,
+        ManagedRoleEffects effects,
+        Clock clock,
+        RoleCandidateSelector candidateSelector,
+        Duration activityWindow,
+        Duration pendingTimeout,
+        RandomGenerator random
+    ) {
+        this.stateManager = stateManager;
+        this.lifecycle = lifecycle;
+        this.onlinePlayers = onlinePlayers;
+        this.effects = effects;
+        this.clock = clock;
+        this.candidateSelector = candidateSelector;
+        this.activityWindow = activityWindow;
+        this.pendingTimeout = pendingTimeout;
+        this.random = random;
+    }
+
+    @Override
+    public boolean onCommand(
+        CommandSender sender,
+        Command command,
+        String label,
+        String[] arguments
+    ) {
+        if (!sender.hasPermission(PERMISSION)) {
+            sender.sendMessage(ChatColor.RED + "You do not have permission to administer Tyrant.");
+            return true;
+        }
+        if (arguments.length == 0 || arguments[0].equalsIgnoreCase("status")) {
+            showStatus(sender);
+            return true;
+        }
+        try {
+            switch (arguments[0].toLowerCase(Locale.ROOT)) {
+                case "start" -> start(sender, arguments);
+                case "pause" -> pause(sender);
+                case "resume" -> resume(sender);
+                case "reset" -> reset(sender, arguments);
+                default -> usage(sender);
+            }
+        } catch (IllegalArgumentException | IllegalStateException exception) {
+            sender.sendMessage(ChatColor.RED + exception.getMessage());
+        }
+        return true;
+    }
+
+    private void start(CommandSender sender, String[] arguments) {
+        if (arguments.length < 2 || arguments.length > 3) {
+            sender.sendMessage(ChatColor.YELLOW
+                + "Usage: /tyrantadmin start <tyrant> [vigilante]");
+            return;
+        }
+        Player tyrant = onlinePlayers.findByName(arguments[1]);
+        if (tyrant == null) {
+            sender.sendMessage(ChatColor.RED + "The initial Tyrant must be online.");
+            return;
+        }
+        Optional<Player> vigilante = Optional.empty();
+        if (arguments.length == 3) {
+            vigilante = Optional.ofNullable(onlinePlayers.findByName(arguments[2]));
+            if (vigilante.isEmpty()) {
+                sender.sendMessage(ChatColor.RED + "The initial Vigilante must be online.");
+                return;
+            }
+        }
+        stateManager.player(tyrant.getUniqueId(), tyrant.getName());
+        vigilante.ifPresent(player -> stateManager.player(player.getUniqueId(), player.getName()));
+        InstantHolder now = new InstantHolder(clock.instant());
+        Optional<UUID> randomCandidate = vigilante.isEmpty()
+            ? candidateSelector.select(
+                stateManager.players(), Set.of(tyrant.getUniqueId()), Optional.empty(),
+                now.value(), activityWindow, random
+            )
+            : Optional.empty();
+        Optional<UUID> activeVigilante = vigilante.map(Player::getUniqueId);
+        if (activeVigilante.isEmpty() && randomCandidate.isPresent()
+                && onlinePlayers.findById(randomCandidate.orElseThrow()) != null) {
+            activeVigilante = randomCandidate;
+        }
+        LifecycleState started = lifecycle.start(
+            stateManager.snapshot(), tyrant.getUniqueId(), activeVigilante, now.value()
+        );
+        if (activeVigilante.isEmpty() && randomCandidate.isPresent()) {
+            GameState game = started.game();
+            started = new LifecycleState(new GameState(
+                game.lifecycle(), game.tyrantId(), game.vigilanteId(), game.pendingTyrant(),
+                Optional.of(new PendingSelection(
+                    randomCandidate.orElseThrow(), now.value().plus(pendingTimeout)
+                )),
+                game.pausedAt(), game.accumulatedPausedTime(), game.tyrantLevel(),
+                game.unspentChoices(), game.purchases()
+            ), started.players());
+        }
+        stateManager.replaceState(started);
+        stateManager.saveIfDirty();
+        effects.restoreAll();
+        sender.sendMessage(ChatColor.GREEN + "Tyrant game started.");
+        if (vigilante.isEmpty()) {
+            sender.sendMessage(ChatColor.YELLOW
+                + "An eligible recently active Vigilante will be selected automatically.");
+        }
+    }
+
+    private void pause(CommandSender sender) {
+        LifecycleState paused = lifecycle.pause(stateManager.snapshot(), clock.instant());
+        stateManager.replaceState(paused);
+        stateManager.saveIfDirty();
+        effects.suppressAll();
+        sender.sendMessage(ChatColor.GREEN + "Tyrant game paused.");
+    }
+
+    private void resume(CommandSender sender) {
+        LifecycleState resumed = lifecycle.resume(stateManager.snapshot(), clock.instant());
+        stateManager.replaceState(resumed);
+        stateManager.saveIfDirty();
+        effects.restoreAll();
+        sender.sendMessage(ChatColor.GREEN + "Tyrant game resumed.");
+    }
+
+    private void reset(CommandSender sender, String[] arguments) {
+        if (arguments.length != 2 || !arguments[1].equalsIgnoreCase("confirm")) {
+            sender.sendMessage(ChatColor.RED
+                + "This clears the game. Use /tyrantadmin reset confirm.");
+            return;
+        }
+        stateManager.replaceState(lifecycle.reset(stateManager.snapshot()));
+        stateManager.saveIfDirty();
+        effects.suppressAll();
+        sender.sendMessage(ChatColor.GREEN + "Tyrant game reset.");
+    }
+
+    private void showStatus(CommandSender sender) {
+        GameState game = stateManager.game();
+        sender.sendMessage(ChatColor.GOLD + "Lifecycle: " + game.lifecycle());
+        sender.sendMessage("Tyrant: " + game.tyrantId().map(Object::toString).orElse("none"));
+        sender.sendMessage("Vigilante: "
+            + game.vigilanteId().map(Object::toString).orElse("none"));
+        sender.sendMessage("Level: " + game.tyrantLevel()
+            + ", choices: " + game.unspentChoices()
+            + ", purchases: " + game.purchases());
+        sender.sendMessage("Pending Tyrant: " + game.pendingTyrant());
+        sender.sendMessage("Pending Vigilante: " + game.pendingVigilante());
+        for (PlayerState player : stateManager.players().values()) {
+            boolean optedOut = player.optedOutUntil()
+                .filter(deadline -> deadline.isAfter(clock.instant()))
+                .isPresent();
+            sender.sendMessage(
+                player.latestName() + " (" + player.playerId() + "): class="
+                    + player.tyrantClass() + ", followerOf="
+                    + player.followerOf().map(Object::toString).orElse("none")
+                    + ", optedOut=" + optedOut + ", cooldowns=" + player.cooldownEnds()
+            );
+        }
+    }
+
+    private record InstantHolder(java.time.Instant value) {
+    }
+
+    private static void usage(CommandSender sender) {
+        sender.sendMessage(ChatColor.YELLOW
+            + "Usage: /tyrantadmin <status|start|pause|resume|reset confirm>");
+    }
+}

src/main/java/games/dmg/spigottyrant/TyrantDeathListener.java

@@ -0,0 +1,65 @@
+package games.dmg.spigottyrant;
+
+import java.time.Clock;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+import org.bukkit.ChatColor;
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.PlayerDeathEvent;
+
+public final class TyrantDeathListener implements Listener {
+    private final TyrantStateManager stateManager;
+    private final TyrantSuccessionService succession;
+    private final TyrantPresentation presentation;
+    private final Server server;
+    private final Clock clock;
+
+    public TyrantDeathListener(
+        TyrantStateManager stateManager,
+        TyrantSuccessionService succession,
+        TyrantPresentation presentation,
+        Server server,
+        Clock clock
+    ) {
+        this.stateManager = stateManager;
+        this.succession = succession;
+        this.presentation = presentation;
+        this.server = server;
+        this.clock = clock;
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onDeath(PlayerDeathEvent event) {
+        UUID victimId = event.getEntity().getUniqueId();
+        GameState game = stateManager.game();
+        if (game.lifecycle() != GameLifecycle.RUNNING
+                || game.tyrantId().filter(victimId::equals).isEmpty()) {
+            return;
+        }
+        Optional<UUID> killerId = Optional.ofNullable(event.getEntity().getKiller())
+            .map(Player::getUniqueId);
+        Set<UUID> online = server.getOnlinePlayers().stream()
+            .map(Player::getUniqueId)
+            .collect(Collectors.toUnmodifiableSet());
+        LifecycleState succeeded = succession.succeed(
+            stateManager.snapshot(), killerId, online, clock.instant()
+        );
+        stateManager.replaceState(succeeded);
+        stateManager.saveIfDirty();
+        presentation.reconcile(succeeded.game().tyrantId());
+        String successor = succeeded.game().tyrantId()
+            .map(id -> {
+                Player player = server.getPlayer(id);
+                return player == null ? id.toString() : player.getName();
+            })
+            .orElse("pending selection");
+        String message = ChatColor.RED + successor + " is the new Tyrant!";
+        server.getOnlinePlayers().forEach(player -> player.sendMessage(message));
+    }
+}

src/main/java/games/dmg/spigottyrant/TyrantPresentation.java

@@ -0,0 +1,10 @@
+package games.dmg.spigottyrant;
+
+import java.util.Optional;
+import java.util.UUID;
+
+public interface TyrantPresentation {
+    void reconcile(Optional<UUID> tyrantId);
+
+    void clear();
+}

src/main/java/games/dmg/spigottyrant/TyrantStateManager.java

@@ -76,6 +76,17 @@ public final class TyrantStateManager {
         return game;
     }
 
+    public void replaceState(LifecycleState replacement) {
+        game = replacement.game();
+        players.clear();
+        players.putAll(replacement.players());
+        dirty = true;
+    }
+
+    public PersistentState snapshot() {
+        return new PersistentState(game, players);
+    }
+
     public boolean saveIfDirty() {
         if (!dirty) {
             return true;

src/main/java/games/dmg/spigottyrant/TyrantSuccessionService.java

@@ -0,0 +1,109 @@
+package games.dmg.spigottyrant;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.random.RandomGenerator;
+
+public final class TyrantSuccessionService {
+    private final RoleCandidateSelector candidates;
+    private final Duration activityWindow;
+    private final Duration pendingTimeout;
+    private final RandomGenerator random;
+
+    public TyrantSuccessionService(
+        RoleCandidateSelector candidates,
+        Duration activityWindow,
+        Duration pendingTimeout,
+        RandomGenerator random
+    ) {
+        this.candidates = candidates;
+        this.activityWindow = activityWindow;
+        this.pendingTimeout = pendingTimeout;
+        this.random = random;
+    }
+
+    public LifecycleState succeed(
+        PersistentState state,
+        Optional<UUID> killerId,
+        Set<UUID> onlinePlayerIds,
+        Instant now
+    ) {
+        if (state.game().lifecycle() != GameLifecycle.RUNNING
+                || state.game().tyrantId().isEmpty()) {
+            throw new IllegalStateException("a running Tyrant reign is required");
+        }
+        UUID formerTyrant = state.game().tyrantId().orElseThrow();
+        Optional<UUID> formerVigilante = state.game().vigilanteId();
+        Map<UUID, PlayerState> clearedPlayers = clearAssignments(state.players());
+        Optional<UUID> selectedTyrant = killerId.isPresent()
+            ? killerId
+            : candidates.select(
+                clearedPlayers,
+                Set.of(),
+                Optional.of(formerTyrant),
+                now,
+                activityWindow,
+                random
+            );
+        Optional<UUID> activeTyrant = selectedTyrant
+            .filter(playerId -> killerId.isPresent() || onlinePlayerIds.contains(playerId));
+        Optional<PendingSelection> pendingTyrant = selectedTyrant
+            .filter(playerId -> activeTyrant.isEmpty())
+            .map(playerId -> new PendingSelection(playerId, now.plus(pendingTimeout)));
+
+        Optional<UUID> selectedVigilante = activeTyrant.flatMap(tyrantId ->
+            candidates.select(
+                clearedPlayers,
+                Set.of(tyrantId),
+                formerVigilante,
+                now,
+                activityWindow,
+                random
+            )
+        );
+        Optional<UUID> activeVigilante = selectedVigilante
+            .filter(onlinePlayerIds::contains);
+        Optional<PendingSelection> pendingVigilante = selectedVigilante
+            .filter(playerId -> activeVigilante.isEmpty())
+            .map(playerId -> new PendingSelection(playerId, now.plus(pendingTimeout)));
+
+        GameState game = new GameState(
+            GameLifecycle.RUNNING,
+            activeTyrant,
+            activeVigilante,
+            pendingTyrant,
+            pendingVigilante,
+            Optional.empty(),
+            state.game().accumulatedPausedTime(),
+            0,
+            1,
+            Set.of()
+        );
+        return new LifecycleState(game, clearedPlayers);
+    }
+
+    private static Map<UUID, PlayerState> clearAssignments(
+        Map<UUID, PlayerState> players
+    ) {
+        Map<UUID, PlayerState> cleared = new HashMap<>();
+        for (PlayerState player : players.values()) {
+            cleared.put(player.playerId(), new PlayerState(
+                player.playerId(),
+                player.latestName(),
+                player.lastLogin(),
+                player.optedOutUntil(),
+                TyrantClass.NONE,
+                Optional.empty(),
+                Map.of(),
+                Set.of(),
+                player.capturedMobs()
+            ));
+        }
+        return Map.copyOf(cleared);
+    }
+}

src/main/resources/plugin.yml

@@ -8,3 +8,11 @@ commands:
   tyrant:
     description: View and use Spigot Tyrant game features.
     usage: /tyrant [choices|buy <unlock>|assign <class> <player>]
+  tyrantadmin:
+    description: Administer the Spigot Tyrant game.
+    usage: /tyrantadmin <status|start|pause|resume|reset confirm>
+    permission: spigottyrant.admin
+permissions:
+  spigottyrant.admin:
+    description: Allows administration of Spigot Tyrant.
+    default: op

src/test/java/games/dmg/spigottyrant/BukkitTyrantPresentationTest.java

@@ -0,0 +1,42 @@
+package games.dmg.spigottyrant;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.util.Optional;
+import java.util.UUID;
+import org.bukkit.ChatColor;
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+import org.bukkit.scoreboard.Scoreboard;
+import org.bukkit.scoreboard.ScoreboardManager;
+import org.bukkit.scoreboard.Team;
+import org.junit.jupiter.api.Test;
+
+final class BukkitTyrantPresentationTest {
+    @Test
+    void givesCurrentTyrantRedNameAndGlowingOutline() {
+        UUID tyrantId = UUID.fromString("11111111-1111-1111-1111-111111111111");
+        Server server = mock(Server.class);
+        ScoreboardManager manager = mock(ScoreboardManager.class);
+        Scoreboard scoreboard = mock(Scoreboard.class);
+        Team team = mock(Team.class);
+        Player tyrant = mock(Player.class);
+        when(server.getScoreboardManager()).thenReturn(manager);
+        when(manager.getMainScoreboard()).thenReturn(scoreboard);
+        when(scoreboard.getTeam("tyrant-red")).thenReturn(null);
+        when(scoreboard.registerNewTeam("tyrant-red")).thenReturn(team);
+        when(server.getPlayer(tyrantId)).thenReturn(tyrant);
+        when(tyrant.getName()).thenReturn("TyrantPlayer");
+        BukkitTyrantPresentation presentation = new BukkitTyrantPresentation(server);
+
+        presentation.reconcile(Optional.of(tyrantId));
+
+        verify(team).setColor(ChatColor.RED);
+        verify(team).addEntry("TyrantPlayer");
+        verify(tyrant).setGlowing(true);
+        verify(tyrant).setPlayerListName(ChatColor.RED + "TyrantPlayer");
+        verify(tyrant).setDisplayName(ChatColor.RED + "TyrantPlayer");
+    }
+}

src/test/java/games/dmg/spigottyrant/GameLifecycleServiceTest.java

@@ -0,0 +1,65 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+final class GameLifecycleServiceTest {
+    private static final UUID TYRANT = UUID.fromString("11111111-1111-1111-1111-111111111111");
+    private static final UUID VIGILANTE = UUID.fromString("22222222-2222-2222-2222-222222222222");
+    private static final Instant START = Instant.parse("2026-08-14T12:00:00Z");
+    private final GameLifecycleService service = new GameLifecycleService();
+
+    @Test
+    void startsFirstGameWithInitialRolesAndChoice() {
+        LifecycleState started = service.start(
+            PersistentState.empty(), TYRANT, Optional.of(VIGILANTE), START
+        );
+
+        assertEquals(GameLifecycle.RUNNING, started.game().lifecycle());
+        assertEquals(Optional.of(TYRANT), started.game().tyrantId());
+        assertEquals(Optional.of(VIGILANTE), started.game().vigilanteId());
+        assertEquals(1, started.game().unspentChoices());
+    }
+
+    @Test
+    void pauseAndResumePreserveStateAndShiftEveryElapsedDeadline() {
+        Instant cooldown = START.plusSeconds(600);
+        PlayerState player = new PlayerState(
+            TYRANT, "Tyrant", Optional.of(START.minusSeconds(60)),
+            Optional.of(START.plusSeconds(1200)), TyrantClass.ASSASSIN,
+            Optional.empty(), Map.of(Ability.ASSASSIN_INVISIBILITY, cooldown),
+            Set.of(), java.util.List.of()
+        );
+        GameState running = new GameState(
+            GameLifecycle.RUNNING, Optional.of(TYRANT), Optional.of(VIGILANTE),
+            Optional.empty(), Optional.of(new PendingSelection(VIGILANTE, cooldown)),
+            Optional.empty(), Duration.ofMinutes(2), 2, 1,
+            Set.of(TyrantUnlock.ASSASSIN)
+        );
+        LifecycleState paused = service.pause(
+            new PersistentState(running, Map.of(TYRANT, player)), START
+        );
+        Instant resumedAt = START.plusSeconds(300);
+
+        LifecycleState resumed = service.resume(paused.asPersistentState(), resumedAt);
+
+        assertEquals(GameLifecycle.RUNNING, resumed.game().lifecycle());
+        assertEquals(Duration.ofMinutes(7), resumed.game().accumulatedPausedTime());
+        assertEquals(cooldown.plusSeconds(300),
+            resumed.game().pendingVigilante().orElseThrow().expiresAt());
+        PlayerState shifted = resumed.players().get(TYRANT);
+        assertEquals(cooldown.plusSeconds(300),
+            shifted.cooldownEnds().get(Ability.ASSASSIN_INVISIBILITY));
+        assertEquals(START.plusSeconds(1500), shifted.optedOutUntil().orElseThrow());
+        assertEquals(START.plusSeconds(240), shifted.lastLogin().orElseThrow());
+        assertTrue(shifted.tyrantClass() == TyrantClass.ASSASSIN);
+    }
+}

src/test/java/games/dmg/spigottyrant/PluginMetadataTest.java

@@ -23,6 +23,11 @@ final class PluginMetadataTest {
         Map<?, ?> commands = (Map<?, ?>) plugin.get("commands");
         assertNotNull(commands);
         assertNotNull(commands.get("tyrant"));
+        assertNotNull(commands.get("tyrantadmin"));
+        Map<?, ?> permissions = (Map<?, ?>) plugin.get("permissions");
+        assertNotNull(permissions);
+        Map<?, ?> admin = (Map<?, ?>) permissions.get("spigottyrant.admin");
+        assertEquals("op", admin.get("default"));
     }
 
     @Test

src/test/java/games/dmg/spigottyrant/RoleCandidateSelectorTest.java

@@ -0,0 +1,46 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.random.RandomGenerator;
+import org.junit.jupiter.api.Test;
+
+final class RoleCandidateSelectorTest {
+    @Test
+    void selectsOnlyRecentlyActiveEligibleNonExcludedPlayer() {
+        Instant now = Instant.parse("2026-08-14T12:00:00Z");
+        UUID tyrant = UUID.fromString("11111111-1111-1111-1111-111111111111");
+        UUID candidate = UUID.fromString("22222222-2222-2222-2222-222222222222");
+        UUID stale = UUID.fromString("33333333-3333-3333-3333-333333333333");
+        Map<UUID, PlayerState> players = Map.of(
+            tyrant, withLogin(PlayerState.newPlayer(tyrant, "Tyrant"), now),
+            candidate, withLogin(PlayerState.newPlayer(candidate, "Candidate"), now.minusSeconds(60)),
+            stale, withLogin(PlayerState.newPlayer(stale, "Stale"), now.minus(Duration.ofHours(25)))
+        );
+
+        Optional<UUID> selected = new RoleCandidateSelector().select(
+            players,
+            Set.of(tyrant),
+            Optional.empty(),
+            now,
+            Duration.ofHours(24),
+            RandomGenerator.of("L64X128MixRandom")
+        );
+
+        assertEquals(Optional.of(candidate), selected);
+    }
+
+    private static PlayerState withLogin(PlayerState player, Instant login) {
+        return new PlayerState(
+            player.playerId(), player.latestName(), Optional.of(login), player.optedOutUntil(),
+            player.tyrantClass(), player.followerOf(), player.cooldownEnds(),
+            player.readyAbilityItems(), player.capturedMobs()
+        );
+    }
+}

src/test/java/games/dmg/spigottyrant/TyrantAdminCommandTest.java

@@ -0,0 +1,87 @@
+package games.dmg.spigottyrant;
+
+import static org.mockito.ArgumentMatchers.contains;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.junit.jupiter.api.Test;
+
+final class TyrantAdminCommandTest {
+    @Test
+    void rejectsSenderWithoutAdminPermission() {
+        TyrantStateManager manager = mock(TyrantStateManager.class);
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigottyrant.admin")).thenReturn(false);
+        TyrantAdminCommand command = command(manager, mock(ManagedRoleEffects.class));
+
+        command.onCommand(sender, mock(Command.class), "tyrantadmin", new String[] {"pause"});
+
+        verify(sender).sendMessage(contains("permission"));
+        verify(manager, never()).replaceState(org.mockito.ArgumentMatchers.any());
+    }
+
+    @Test
+    void pausePreservesStateAndSuppressesManagedEffects() {
+        UUID tyrant = UUID.fromString("11111111-1111-1111-1111-111111111111");
+        GameState game = new GameState(
+            GameLifecycle.RUNNING, Optional.of(tyrant), Optional.empty(),
+            Optional.empty(), Optional.empty(), Optional.empty(), Duration.ZERO,
+            2, 1, Set.of(TyrantUnlock.STRENGTH)
+        );
+        PersistentState snapshot = new PersistentState(
+            game, Map.of(tyrant, PlayerState.newPlayer(tyrant, "Tyrant"))
+        );
+        TyrantStateManager manager = mock(TyrantStateManager.class);
+        when(manager.snapshot()).thenReturn(snapshot);
+        ManagedRoleEffects effects = mock(ManagedRoleEffects.class);
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigottyrant.admin")).thenReturn(true);
+        TyrantAdminCommand command = command(manager, effects);
+
+        command.onCommand(sender, mock(Command.class), "tyrantadmin", new String[] {"pause"});
+
+        verify(manager).replaceState(org.mockito.ArgumentMatchers.argThat(
+            state -> state.game().lifecycle() == GameLifecycle.PAUSED
+                && state.game().tyrantLevel() == 2
+        ));
+        verify(effects).suppressAll();
+    }
+
+    @Test
+    void resetRequiresExplicitConfirmation() {
+        TyrantStateManager manager = mock(TyrantStateManager.class);
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigottyrant.admin")).thenReturn(true);
+        TyrantAdminCommand command = command(manager, mock(ManagedRoleEffects.class));
+
+        command.onCommand(sender, mock(Command.class), "tyrantadmin", new String[] {"reset"});
+
+        verify(sender).sendMessage(contains("reset confirm"));
+        verify(manager, never()).replaceState(org.mockito.ArgumentMatchers.any());
+    }
+
+    private static TyrantAdminCommand command(
+        TyrantStateManager manager,
+        ManagedRoleEffects effects
+    ) {
+        return new TyrantAdminCommand(
+            manager,
+            new GameLifecycleService(),
+            mock(OnlinePlayerDirectory.class),
+            effects,
+            Clock.fixed(Instant.parse("2026-08-14T12:00:00Z"), ZoneOffset.UTC)
+        );
+    }
+}

src/test/java/games/dmg/spigottyrant/TyrantDeathListenerTest.java

@@ -0,0 +1,71 @@
+package games.dmg.spigottyrant;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.PlayerDeathEvent;
+import org.junit.jupiter.api.Test;
+
+final class TyrantDeathListenerTest {
+    @Test
+    void tyrantDeathAppliesSuccessionAndPresentation() {
+        UUID tyrantId = UUID.fromString("11111111-1111-1111-1111-111111111111");
+        UUID killerId = UUID.fromString("22222222-2222-2222-2222-222222222222");
+        GameState game = new GameState(
+            GameLifecycle.RUNNING, Optional.of(tyrantId), Optional.empty(),
+            Optional.empty(), Optional.empty(), Optional.empty(), Duration.ZERO,
+            0, 1, Set.of()
+        );
+        PersistentState before = new PersistentState(game, Map.of());
+        GameState succeededGame = new GameState(
+            GameLifecycle.RUNNING, Optional.of(killerId), Optional.empty(),
+            Optional.empty(), Optional.empty(), Optional.empty(), Duration.ZERO,
+            0, 1, Set.of()
+        );
+        LifecycleState succeeded = new LifecycleState(succeededGame, Map.of());
+        TyrantStateManager manager = mock(TyrantStateManager.class);
+        when(manager.game()).thenReturn(game);
+        when(manager.snapshot()).thenReturn(before);
+        TyrantSuccessionService succession = mock(TyrantSuccessionService.class);
+        when(succession.succeed(eq(before), eq(Optional.of(killerId)), any(), any()))
+            .thenReturn(succeeded);
+        TyrantPresentation presentation = mock(TyrantPresentation.class);
+        Server server = mock(Server.class);
+        Player victim = mock(Player.class);
+        when(victim.getUniqueId()).thenReturn(tyrantId);
+        Player killer = mock(Player.class);
+        when(killer.getUniqueId()).thenReturn(killerId);
+        when(victim.getKiller()).thenReturn(killer);
+        doReturn(List.of(victim, killer)).when(server).getOnlinePlayers();
+        PlayerDeathEvent event = mock(PlayerDeathEvent.class);
+        when(event.getEntity()).thenReturn(victim);
+        TyrantDeathListener listener = new TyrantDeathListener(
+            manager,
+            succession,
+            presentation,
+            server,
+            Clock.fixed(Instant.parse("2026-08-14T12:00:00Z"), ZoneOffset.UTC)
+        );
+
+        listener.onDeath(event);
+
+        verify(manager).replaceState(succeeded);
+        verify(presentation).reconcile(Optional.of(killerId));
+        verify(killer).sendMessage(org.mockito.ArgumentMatchers.contains("new Tyrant"));
+    }
+}

src/test/java/games/dmg/spigottyrant/TyrantSuccessionServiceTest.java

@@ -0,0 +1,95 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.random.RandomGenerator;
+import org.junit.jupiter.api.Test;
+
+final class TyrantSuccessionServiceTest {
+    private static final UUID OLD_TYRANT = UUID.fromString("11111111-1111-1111-1111-111111111111");
+    private static final UUID OLD_VIGILANTE = UUID.fromString("22222222-2222-2222-2222-222222222222");
+    private static final UUID KILLER = UUID.fromString("33333333-3333-3333-3333-333333333333");
+    private static final UUID OTHER = UUID.fromString("44444444-4444-4444-4444-444444444444");
+    private static final Instant NOW = Instant.parse("2026-08-14T12:00:00Z");
+    private final TyrantSuccessionService service = new TyrantSuccessionService(
+        new RoleCandidateSelector(),
+        Duration.ofHours(24),
+        Duration.ofHours(24),
+        RandomGenerator.of("L64X128MixRandom")
+    );
+
+    @Test
+    void playerKillerBecomesTyrantAndEntireReignIsReset() {
+        PersistentState before = progressedState();
+
+        LifecycleState after = service.succeed(
+            before, Optional.of(KILLER), Set.of(KILLER, OTHER), NOW
+        );
+
+        assertEquals(Optional.of(KILLER), after.game().tyrantId());
+        assertEquals(0, after.game().tyrantLevel());
+        assertEquals(1, after.game().unspentChoices());
+        assertEquals(Set.of(), after.game().purchases());
+        assertNotEquals(after.game().tyrantId(), after.game().vigilanteId());
+        for (PlayerState player : after.players().values()) {
+            assertEquals(TyrantClass.NONE, player.tyrantClass());
+            assertEquals(Optional.empty(), player.followerOf());
+            assertEquals(Map.of(), player.cooldownEnds());
+        }
+    }
+
+    @Test
+    void environmentalDeathRandomlySelectsRecentPlayerInsteadOfFormerTyrant() {
+        PersistentState before = progressedState();
+
+        LifecycleState after = service.succeed(before, Optional.empty(), Set.of(OTHER), NOW);
+
+        UUID selected = after.game().tyrantId().orElseGet(() ->
+            after.game().pendingTyrant().orElseThrow().candidateId()
+        );
+        assertNotEquals(OLD_TYRANT, selected);
+    }
+
+    private static PersistentState progressedState() {
+        GameState game = new GameState(
+            GameLifecycle.RUNNING, Optional.of(OLD_TYRANT), Optional.of(OLD_VIGILANTE),
+            Optional.empty(), Optional.empty(), Optional.empty(), Duration.ZERO,
+            5, 2, Set.of(TyrantUnlock.ASSASSIN, TyrantUnlock.STRENGTH)
+        );
+        Map<UUID, PlayerState> players = Map.of(
+            OLD_TYRANT, active(new PlayerState(
+                OLD_TYRANT, "OldTyrant", Optional.empty(), Optional.empty(),
+                TyrantClass.NONE, Optional.empty(),
+                Map.of(Ability.ROSTER_INTELLIGENCE, NOW.plusSeconds(20)),
+                Set.of(), java.util.List.of()
+            )),
+            OLD_VIGILANTE, active(new PlayerState(
+                OLD_VIGILANTE, "OldVigilante", Optional.empty(), Optional.empty(),
+                TyrantClass.ASSASSIN, Optional.empty(),
+                Map.of(Ability.ASSASSIN_INVISIBILITY, NOW.plusSeconds(20)),
+                Set.of(Ability.ASSASSIN_INVISIBILITY), java.util.List.of()
+            )),
+            KILLER, active(PlayerState.newPlayer(KILLER, "Killer")),
+            OTHER, active(new PlayerState(
+                OTHER, "Other", Optional.empty(), Optional.empty(), TyrantClass.FIXER,
+                Optional.of(OLD_VIGILANTE), Map.of(), Set.of(), java.util.List.of()
+            ))
+        );
+        return new PersistentState(game, players);
+    }
+
+    private static PlayerState active(PlayerState player) {
+        return new PlayerState(
+            player.playerId(), player.latestName(), Optional.of(NOW.minusSeconds(60)),
+            player.optedOutUntil(), player.tyrantClass(), player.followerOf(),
+            player.cooldownEnds(), player.readyAbilityItems(), player.capturedMobs()
+        );
+    }
+}