Reflected permanent curses return to their caster (rules rev 11)

SLOW DEATH, WALKING DEAD, and IDIOT ride no damage or duration pipe, so
a FULL REFLECTION used to evaporate them; per the FAQ reflections act on
the cast, so the returned curse now opens its stack against the caster
like any reflected spell. Marked permanentCurse on the three defs; older
ledgers keep the evaporation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015RCWSTnb1KYTPyL4GmhGnF

packages/engine/src/game.ts

@@ -271,7 +271,9 @@ export interface GameConfig {
    * corridors on the turn's legal legs (three plus numbers) and spends
    * them.
    * Rev 11: a REVERSE against SLOW DEATH turns the whole curse (FAQ) —
-   * the victim gains a point for every card drawn, permanently.
+   * the victim gains a point for every card drawn, permanently — and a
+   * FULL REFLECTION returns a permanent curse (SLOW DEATH, WALKING DEAD,
+   * IDIOT) onto its caster instead of letting it evaporate.
    */
   deckRev?: number;
 }
@@ -826,6 +828,10 @@ type AttackEffect = {
   baseDamage: (numberValue: number | null, params: CastParams | null) => number;
   /** A duration spell: attach a sustained effect on resolution. */
   sustains?: boolean;
+  /** A permanent curse attached by onResolved (SLOW DEATH, WALKING DEAD,
+   * IDIOT): it rides no damage or duration pipe, so a FULL REFLECTION
+   * must return it explicitly or the curse would evaporate. */
+  permanentCurse?: true;
   /** Card stays in hand and is displayed rather than discarded (WIZARDBLADE). */
   keepInHand?: boolean;
   validate?: (state: GameState, cmd: Extract<Command, { type: "cast" }>, caster?: PlayerState, target?: PlayerState) => string | null;
@@ -1720,6 +1726,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
     kind: "attack",
     requiresLos: true,
     baseDamage: () => 0,
+    permanentCurse: true,
     // "This is permanent. Once SLOW DEATH is on, it can't be turned off."
     // Rev 11, per the FAQ: "If SLOW DEATH is REVERSED, the player receives
     // a point for every card drawn" — the whole curse attaches backward,
@@ -2210,6 +2217,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
     kind: "attack",
     requiresLos: true,
     baseDamage: () => 0,
+    permanentCurse: true,
     // "1/2 point of damage for every space moved. This spell is permanent."
     onResolved: (ctx) => {
       if (ctx.fullyStopped || !ctx.defender.alive) return;
@@ -2554,6 +2562,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
     kind: "attack",
     requiresLos: true,
     baseDamage: () => 0,
+    permanentCurse: true,
     // "Opponent heads straight for the nearest of his own treasures ... This
     // lasts until opponent is on his own treasure."
     sustains: false,
@@ -6043,9 +6052,11 @@ function resolveStack(state: GameState, events: GameEvent[]): void {
       return;
     }
     // The returned spell is a fresh attack on its own caster — who gets a
-    // defender's counteraction window against it.
+    // defender's counteraction window against it. Rev 11: permanent curses
+    // ride the return too; older games let a reflected curse evaporate.
+    const returnsCurse = effect?.permanentCurse === true && (state.config.deckRev ?? 1) >= 11;
     if (!stack.trapped && !attackingCreature &&
-        attacker.alive && (pipe.damage > 0 || pipe.duration > 0)) {
+        attacker.alive && (pipe.damage > 0 || pipe.duration > 0 || returnsCurse)) {
       state.stack = {
         attackerId: defender.id,
         defenderId: attacker.id,

packages/engine/test/stones.test.ts

@@ -170,6 +170,26 @@ describe("slow death", () => {
     expect(state.players.find((p) => p.id === defender)!.life).toBe(17);
   });
 
+  it("a full reflection returns the curse onto its caster (rev 11)", () => {
+    let { state } = newGame();
+    state = toRound2(state);
+    const { attacker, defender } = faceOff(state);
+    const sd = giveCard(state, attacker, "slow-death");
+    giveCard(state, defender, "full-reflection", "FR", 0);
+    const r = applyCommand(state, attacker, {
+      type: "cast", instanceId: sd.instanceId, target: { kind: "player", playerId: defender },
+    });
+    if (!r.ok) throw new Error(r.error);
+    state = must(r.state, defender, { type: "counteract", instanceId: "full-reflection#FR" });
+    state = drain(state);
+    expect(sustainedOn(state, defender, "slow-death").length).toBe(0);
+    expect(sustainedOn(state, attacker, "slow-death").length).toBe(1);
+
+    // The caster now bleeds for their own draws.
+    state = must(state, attacker, { type: "endTurn", draw: 1 });
+    expect(state.players.find((p) => p.id === attacker)!.life).toBe(14);
+  });
+
   it("older decks attach the biting curse through a reverse (rev ≤10)", () => {
     let { state } = createGame({ playerIds: ["alice", "bob"], seed: 42, sets: ["basic"], deckRev: 10 });
     state = toRound2(state);