The imp's fire is a spell; the soulstone floor holds (rules rev 8)

Eric flagged both mid-game, and the second one killed me while he
typed: the scorch carried no damage kind, slipping past SOULSTONE
entirely, and the stone's own clamp guarded only from above — a bearer
already at 3 or less had no protection at all, the exact opposite of
"last three points cannot be taken by spell attack." At rev 8 the
floor holds from below (spell damage at or under the floor is simply
immune), and per the FAQ the scorch is a SPELL: it opens a
counteraction window, burns as magical fire, and FULL SHIELD parts it.
One victim's window at a time; the sweep finds the rest next pass.
Older games — including tonight's, where the flaw was fatal — replay
their recorded flames unchanged; all 34 ledgers verify.

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

packages/engine/test/creatures.test.ts

@@ -146,29 +146,37 @@ describe("monsters", () => {
     expect(bitten.hand.length).toBe(6);
   });
 
+  /** Rev 8: scorches open counteraction windows — wave them through. */
+  function drain(state: GameState): GameState {
+    while (state.stack) {
+      state = must(state, state.stack.waitingOn, { type: "pass" });
+    }
+    return state;
+  }
+
   it("the fire imp scorches on sight and dies only to water", () => {
     let { state } = newGame();
     state = toRound2(state);
     const me = activePlayer(state).id;
     const r = summon(state, me, "fire-imp");
-    state = r.state;
+    state = drain(r.state);
     const imp = state.creatures[0]!;
 
     // Fireball cannot destroy it...
-    state = must(state, me, { type: "endTurn", draw: 0 });
+    state = drain(must(state, me, { type: "endTurn", draw: 0 }));
     const enemy = state.players.find((p) => p.id !== me)!;
     // (enemy may have been scorched at turn start if in LOS — note life)
     const enemyNow = state.players.find((p) => p.id !== me)!;
     enemyNow.position = { ...imp.position }; // stand at the imp for clear sight
     const fb = giveCard(state, enemy.id, "fireball", "F", 0);
-    state = must(state, enemy.id, {
+    state = drain(must(state, enemy.id, {
       type: "cast", instanceId: fb.instanceId, target: { kind: "creature", creatureId: imp.id },
-    });
+    }));
     expect(state.creatures.length).toBe(1);
 
     // ...but a waterbolt douses it instantly.
-    state = must(state, enemy.id, { type: "endTurn", draw: 0 });
-    state = must(state, me, { type: "endTurn", draw: 0 });
+    state = drain(must(state, enemy.id, { type: "endTurn", draw: 0 }));
+    state = drain(must(state, me, { type: "endTurn", draw: 0 }));
     state.players.find((p) => p.id !== me)!.position = { ...state.creatures[0]!.position };
     const wb = giveCard(state, enemy.id, "waterbolt", "W", 0);
     state = must(state, enemy.id, {
@@ -787,3 +795,59 @@ describe("creatures and the dimensional warp", () => {
     if (!r.ok) expect(r.error).toContain("stone");
   });
 });
+
+describe("the imp's fire is a spell (rev 8)", () => {
+  function impRig() {
+    let { state } = createGame({ playerIds: ["imp-owner", "mark"], seed: 42, sets: ["basic", "expansion1"] });
+    state = toRound2(state);
+    while (activePlayer(state).id !== "imp-owner") {
+      state = must(state, activePlayer(state).id, { type: "endTurn", draw: 0 });
+    }
+    return state;
+  }
+
+  it("scorch opens a counteraction window and FULL SHIELD stops it", () => {
+    let state = impRig();
+    const owner = state.players.find((p) => p.id === "imp-owner")!;
+    const mark = state.players.find((p) => p.id === "mark")!;
+    mark.position = { ...owner.position };
+    const impCard = giveCard(state, "imp-owner", "fire-imp", "FI", 0);
+    const spot = emptyNeighborCell(state, owner.position);
+    let r = applyCommand(state, "imp-owner", {
+      type: "cast", instanceId: impCard.instanceId, target: { kind: "cell", cell: spot.cell },
+    });
+    if (!r.ok) throw new Error(r.error);
+    state = r.state;
+    if (!state.stack) state = must(state, "imp-owner", { type: "endTurn", draw: 0 });
+    // The scorch rides the stack now: a counteraction window, spell-kind.
+    expect(state.stack?.creatureId).toBeTruthy();
+    expect(state.stack?.kind).toBe("spell");
+    giveCard(state, "mark", "full-shield", "FS", 0);
+    state = must(state, "mark", { type: "counteract", instanceId: "full-shield#FS" });
+    while (state.stack) state = must(state, state.stack.waitingOn, { type: "pass" });
+    expect(state.players.find((p) => p.id === "mark")!.life).toBe(15);
+  });
+
+  it("soulstone's floor holds from below: a bearer at 2 takes nothing from the flame", () => {
+    let state = impRig();
+    const owner = state.players.find((p) => p.id === "imp-owner")!;
+    const mark = state.players.find((p) => p.id === "mark")!;
+    mark.position = { ...owner.position };
+    mark.life = 2;
+    mark.displayed.push("SS");
+    mark.hand[0] = { instanceId: "SS", cardId: "soulstone" };
+    const impCard = giveCard(state, "imp-owner", "fire-imp", "FI", 1);
+    const spot = emptyNeighborCell(state, owner.position);
+    let r = applyCommand(state, "imp-owner", {
+      type: "cast", instanceId: impCard.instanceId, target: { kind: "cell", cell: spot.cell },
+    });
+    if (!r.ok) throw new Error(r.error);
+    state = r.state;
+    if (!state.stack) state = must(state, "imp-owner", { type: "endTurn", draw: 0 });
+    expect(state.stack?.kind).toBe("spell");
+    while (state.stack) state = must(state, state.stack.waitingOn, { type: "pass" });
+    const after = state.players.find((p) => p.id === "mark")!;
+    expect(after.life).toBe(2);
+    expect(after.alive).toBe(true);
+  });
+});