✅ Camio stolas fused exhaust kills deploys serpent

Category	Interaction
Status	Passing
Test	tests/test_abilities_complex.py::TestCamioStolasTriggerChain::test_camio_stolas_fused_exhaust_kills_deploys_serpent

Tests interaction between Camio, Duban, Sabnock.

Preconditions

• P1 Main Phase, P1 has 6 AP

• Lane 0: P1's Camio (#098) fused with Stolas (#022) — READIED

• Lane 0: P2's Duban (#001) — 6 HP, 5 damage (1 HP remaining)

• Lane 0: P2's Sabnock (#003) — READIED (will exhaust to trigger Stolas)

• P1's familiar_deck contains "098_1" (Black Serpent)

Action

• Fire DEMON_EXHAUSTED event (Sabnock exhausts in lane 0)

RESOLUTION CHAIN:

1. DEMON_EXHAUSTED fires (source=Sabnock)

2. Stolas trigger fires (fused bottom of Camio) — deals 1 Fixed Damage

3. deal_fixed_damage fires DAMAGE_RECEIVED on Duban

4. Duban is fatally_wounded (damage 6 >= HP 6)

5. FATALLY_WOUNDED fires (if wired in execute_ability step 10/11)

from engine.events import fire_event, GameEvent, EventType

        camio_stolas = make_fused_demon("098", "022", lane=0, owner=Side.PLAYER_1)
        duban = make_demon("001", lane=0, owner=Side.PLAYER_2)
        sabnock = make_demon("003", lane=0, owner=Side.PLAYER_2)

        state, placed = _make_state_with_demons(camio_stolas, duban, sabnock, ap=6)
        camio_p, duban_p, sabnock_p = placed

        # Duban has 5 damage on 6 HP (1 remaining)
        duban_p.damage = 5

        # P1 has Black Serpent in familiar deck
        state.players[Side.PLAYER_1].familiar_deck.append("098_1")

        # Fire DEMON_EXHAUSTED (Sabnock exhausts)
        event = GameEvent(
            event_type=EventType.DEMON_EXHAUSTED,
            source=sabnock_p,
            target=sabnock_p,
            value=None,
            side=Side.PLAYER_2,
            lane=0,
        )
        result = fire_event(state, event)

        # Duban should be fatally wounded (5+1=6 damage on 6 HP)
        duban_after = next(
            (d for d in result.demons if d.unit_id == "001"), None
        )
        if duban_after is not None:

Expected Postconditions

• Duban: removed from board (fatally wounded, 6 damage on 6 HP)

• Black Serpent: deployed if Camio's FATALLY_WOUNDED trigger fires

Assertions

assert duban_after.fatally_wounded, (
                f"Duban should be fatally wounded (5+1=6 damage on 6 HP). "
                f"Got damage={duban_after.damage}, fw={duban_after.fatally_wounded}"
            )

        # FATALLY_WOUNDED fires from deal_fixed_damage → Camio's trigger sees it
        # → Black Serpent should be deployed (or at least removed from familiar_deck)
        serpent_on_field = any(d.unit_id == "098_1" for d in result.demons)
        serpent_still_in_deck = "098_1" in result.players[Side.PLAYER_1].familiar_deck
        assert serpent_on_field or not serpent_still_in_deck, (
            f"Black Serpent should be deployed (Camio's trigger fires on FATALLY_WOUNDED). "
            f"On field: {serpent_on_field}, in deck: {serpent_still_in_deck}"
        )