diff --git a/src/pf1e_simulator/combat.py b/src/pf1e_simulator/combat.py
index bc19c69..4f8a513 100644
--- a/src/pf1e_simulator/combat.py
+++ b/src/pf1e_simulator/combat.py
@@ -5652,7 +5652,9 @@ class CombatEngine:
         if affected_state.hp < 0:
             affected_state.stabilized_hp = affected_state.hp
         actual = affected_state.hp - old_hp
-        self._stats[state.combatant.id].damage_dealt += actual
+        # Healing is NOT damage dealt: the attrition counters track damage only
+        # (README "degats infligés/subis"), consistent with spell healing
+        # (HealEffect), which is counted nowhere.
         self._stop_bleeding(affected_state)
         self._log(
             f"round {self._current_round} {state.combatant.id}: "
diff --git a/tests/test_class_abilities.py b/tests/test_class_abilities.py
index c92966e..2174984 100644
--- a/tests/test_class_abilities.py
+++ b/tests/test_class_abilities.py
@@ -202,6 +202,43 @@ def test_oni_channel_heal_heals_living_enemies_in_range() -> None:
     assert enemy[0].hp == min(2 + (1 + 5), 6)  # healed, capped at hp_max
 
 
+def test_oni_channel_heal_is_not_counted_as_damage_dealt() -> None:
+    """Attrition counts damage only (README "dégâts infligés/subis"): channel
+    healing restores hp but must leave damage_dealt at 0, while the harm mode
+    of the same feature still records its damage."""
+    oni = _combatant("oni", resources={"channel_energy": 6}, hp_max=30)
+    goblin = _combatant("goblin", hp_max=6)
+    engine, me, enemy = _engine(oni, [goblin], rng_queue=[5])
+    enemy[0].hp = 2
+
+    engine._execute(
+        me,
+        Action(kind="channel_energy", target_id=me.combatant.id, channel_mode="heal"),
+    )
+
+    assert enemy[0].hp == 6  # the heal itself still lands
+    assert engine._stats["oni"].damage_dealt == 0
+    assert engine._stats["oni"].damage_taken == 0
+    assert engine._stats["goblin"].damage_taken == 0
+
+
+def test_oni_channel_harm_is_counted_as_damage_dealt() -> None:
+    """The damage mode of the same feature still records damage_dealt and
+    damage_taken (a failed Will save takes full 2d6)."""
+    oni = _combatant("oni", resources={"channel_energy": 6}, hp_max=30)
+    lich = _combatant("lich", hp_max=100, creature_type="undead")
+    engine, me, enemy = _engine(oni, [lich], rng_queue=[11, 5])
+
+    engine._execute(
+        me, Action(kind="channel_energy", target_id=lich.id, channel_mode="harm")
+    )
+
+    dealt = 1 + 11  # 2d6 scripted, save failed
+    assert enemy[0].hp == 100 - dealt
+    assert engine._stats["oni"].damage_dealt == dealt
+    assert engine._stats["lich"].damage_taken == dealt
+
+
 def test_oni_emits_channel_harm_only_for_grouped_undead() -> None:
     """Channel harm is emitted only when at least 2 undead enemies are grouped at 30ft
     — living enemies are never harmed by positive energy."""