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fix(rules): allow a Will save to halve channeled energy damage

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PF1e CRB (Channel Energy): creatures damaged by channeled energy get a Will
save (DC 10 + half the channeler's level + her Charisma modifier) for half
damage (floor). Harm mode only; heal mode unchanged. Charisma is used RAW
even for casters whose spellcasting ability differs (channeling is a
Charisma class feature).

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
This commit is contained in:
Thien An
2026-09-11 20:24:51 +02:00
parent 6f784d3369
commit e321c67779
3 changed files with 47 additions and 12 deletions
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src/pf1e_simulator/combat.py
+25 -9
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@@ -4195,7 +4195,9 @@ class CombatEngine:
Heal mode heals all living creatures in the burst; harm mode damages
all undead creatures in the burst — the target's side does not matter
(PF1e Channel Energy: positive energy heals living creatures and
damages undead creatures within 30 feet).
damages undead creatures within 30 feet). Damaged creatures get a
Will save (DC 10 + half the channeler's level + her Cha modifier)
for half damage (CRB Channel Energy).
"""
if not state.spend_resource("channel_energy", 1):
self._log(
@@ -4223,11 +4225,20 @@ class CombatEngine:
# 2d6 damage/healing
dmg = 1 + self._rng.roll_die(11) # 2d6
# PF1e (CRB, Channel Energy): creatures damaged by the channel get a
# Will save (DC 10 + half the channeler's level + her Charisma
# modifier) for half damage. Charisma is used RAW even when the
# caster's spellcasting ability is another one (channeling is a
# Charisma class feature). Heal mode grants no save.
channel_dc = 10 + state.combatant.level // 2 + (
(state.combatant.abilities.cha_score - 10) // 2
)
for affected_state in hit:
if channel_mode == "heal":
self._channel_heal(state, affected_state, dmg)
else:
self._channel_damage(state, affected_state, dmg)
self._channel_damage(state, affected_state, dmg, channel_dc)
self._log(
f"round {self._current_round} {state.combatant.id}: "
@@ -4248,15 +4259,20 @@ class CombatEngine:
)
def _channel_damage(
self, state: CombatantState, affected_state: CombatantState, dmg: int
self, state: CombatantState, affected_state: CombatantState, dmg: int, dc: int
) -> None:
"""Apply channel energy damage: Will save (DC from the channeler) for half."""
save = self.resolve_save(affected_state, "will", dc)
dealt = dmg // 2 if save.success else dmg
hp_before = affected_state.hp
affected_state.hp -= dmg
self._stats[state.combatant.id].damage_dealt += dmg
self._stats[affected_state.combatant.id].damage_taken += dmg
affected_state.hp -= dealt
self._stats[state.combatant.id].damage_dealt += dealt
self._stats[affected_state.combatant.id].damage_taken += dealt
self._log(
f"round {self._current_round} {state.combatant.id}: "
f"channel energy damages {affected_state.combatant.id} {dmg} "
f"round {self._current_round} {state.combatant.id}: channel energy "
f"damages {affected_state.combatant.id} {dealt} "
f"(Will DC{dc} d20={save.roll}+{save.total - save.roll}={save.total} "
f"{'SAVED half' if save.success else 'FAILED full'}) "
f"({hp_before}->{affected_state.hp})"
)
if affected_state.dead:
@@ -4269,7 +4285,7 @@ class CombatEngine:
kind="damage_taken",
actor=state,
target=affected_state,
damage=dmg,
damage=dealt,
)
)