diff --git a/libs/gw2_analytics/src/gw2_analytics/rotation.py b/libs/gw2_analytics/src/gw2_analytics/rotation.py
index 52429ee2..04138008 100644
--- a/libs/gw2_analytics/src/gw2_analytics/rotation.py
+++ b/libs/gw2_analytics/src/gw2_analytics/rotation.py
@@ -957,9 +957,9 @@ def add_instant(source: int, skill_id: int, time_ms: int, icd: int = 50) -> None
                     add_instant(owner, 12658, event.time_ms)
         # Spiteful Spirit (29560) - EI has two finders:
         # 1. DamageCastFinder: disabled when effect data exists
-        # (UsingDisableWithEffectData)
-        # 2. EffectCastFinder for UnholyBurst: triggers on effect with
-        # DesertShroud/related hit checks
+        #    (UsingDisableWithEffectData)
+        # 2. EffectCastFinder for UnholyBurst: triggers on effect
+        #    with DesertShroud/related hit checks
         elif isinstance(event, DamageEvent) and event.skill_id == 29560:
             source_is_necro = (
                 not professions or professions.get(event.source_agent_id) is Profession.NECROMANCER
@@ -974,7 +974,7 @@ def add_instant(source: int, skill_id: int, time_ms: int, icd: int = 50) -> None
             )
 
             if has_unholy_burst_in_fight:
-                # EI disables DamageCastFinder when effect data exists (UsingDisableWithEffectData)
+                # EI disables DamageCastFinder when effect data exists
                 # Let the EffectCastFinder handle it via UnholyBurst effect events
                 continue
             # No UnholyBurst effect data in fight: use DamageCastFinder
@@ -1189,7 +1189,35 @@ def add_instant(source: int, skill_id: int, time_ms: int, icd: int = 50) -> None
                 base_skill = _BASE_SKILL_BY_ENHANCED_EFFECT.get(event.guid)
                 if base_skill is not None and (caster, base_skill) in active:
                     continue
-                if event.guid != "C4E8DD3234E0C647993857940ED79AC1" or not any(
+                # Spiteful Spirit (29560) via UnholyBurst effect (EffectCastFinder path)
+                # EI's EffectCastFinder for Spiteful Spirit triggers on UnholyBurst effect
+                # with DesertShroud and related hit checks
+                if event.guid == "C4E8DD3234E0C647993857940ED79AC1":
+                    # DesertShroud check: no DesertShroud buff removal within 50ms
+                    desert_shroud_removal = any(
+                        isinstance(other, BoonApplyEvent)
+                        and other.kind == "remove_all"
+                        and other.skill_id == 40052  # DesertShroudBuff
+                        and other.source_agent_id == caster
+                        and abs(other.time_ms - event.time_ms) < 50
+                        for other in nearby_events(event.time_ms, 50)
+                    )
+                    if desert_shroud_removal:
+                        continue
+
+                    # Related hit check: no UnholyBurst hit from same caster within 10ms
+                    related_hit = any(
+                        isinstance(other, DamageEvent)
+                        and other.source_agent_id == caster
+                        and other.skill_id == 38767  # UnholyBurst
+                        and abs(other.time_ms - event.time_ms) < 10
+                        for other in nearby_events(event.time_ms, 10)
+                    )
+                    if related_hit:
+                        continue
+
+                    add_instant(caster, effect_skill_id, event.time_ms)
+                elif event.guid != "C4E8DD3234E0C647993857940ED79AC1" or not any(
                     isinstance(other, DamageEvent)
                     and other.source_agent_id == caster
                     and other.skill_id == 38767