diff --git a/zone/common.h b/zone/common.h
index 420d71c9b..5698d6c17 100644
--- a/zone/common.h
+++ b/zone/common.h
@@ -207,6 +207,7 @@ enum {
 	MODIFY_AVOID_DAMAGE = 51,                    //Modify by percent the NPCs chance to riposte, block, parry or dodge individually, or for all skills
 	IMMUNE_FADING_MEMORIES = 52,
 	IMMUNE_OPEN = 53,
+	IMMUNE_ASSASSINATE = 54,
 	MAX_SPECIAL_ATTACK
 };
 
diff --git a/zone/lua_mob.cpp b/zone/lua_mob.cpp
index 8ceaef72f..d1edff617 100644
--- a/zone/lua_mob.cpp
+++ b/zone/lua_mob.cpp
@@ -3757,7 +3757,8 @@ luabind::scope lua_register_special_abilities() {
 				luabind::value("immune_aggro_client", static_cast<int>(IMMUNE_AGGRO_CLIENT)),
 				luabind::value("immune_aggro_npc", static_cast<int>(IMMUNE_AGGRO_NPC)),
 				luabind::value("modify_avoid_damage", static_cast<int>(MODIFY_AVOID_DAMAGE)),
-				luabind::value("immune_open", static_cast<int>(IMMUNE_OPEN))
+				luabind::value("immune_open", static_cast<int>(IMMUNE_OPEN)),
+				luabind::value("immune_assassinate", static_cast<int>(IMMUNE_ASSASSINATE))
 		)];
 }
 
diff --git a/zone/special_attacks.cpp b/zone/special_attacks.cpp
index bcfe43c15..422537247 100644
--- a/zone/special_attacks.cpp
+++ b/zone/special_attacks.cpp
@@ -2337,7 +2337,8 @@ int Mob::TryAssassinate(Mob *defender, EQ::skills::SkillType skillInUse)
 		!defender->IsClient() &&
 		GetLevel() >= 60 &&
 		(skillInUse == EQ::skills::SkillBackstab || skillInUse == EQ::skills::SkillThrowing) &&
-		(defender->GetBodyType() == BT_Humanoid || !RuleB(Combat, AssassinateOnlyHumanoids))
+		(defender->GetBodyType() == BT_Humanoid || !RuleB(Combat, AssassinateOnlyHumanoids)) &&
+		!defender->GetSpecialAbility(IMMUNE_ASSASSINATE)
 	) {
 		int chance = GetDEX();
 		if (skillInUse == EQ::skills::SkillBackstab) {