diff --git a/common/spdat.h b/common/spdat.h
index 64e831516..98423f9a7 100644
--- a/common/spdat.h
+++ b/common/spdat.h
@@ -1067,7 +1067,7 @@ typedef enum {
 #define SE_ShadowStepDirectional		379 // implemented - handled by client
 #define SE_Knockdown					380 // implemented - small knock back(handled by client)
 //#define SE_KnockTowardCaster			381	// *not implemented (Call of Hither) knocks you back to caster (value) distance units infront
-#define SE_NegateSpellEffect			382 // implemented, @Debuff, negates specific spell effect benefits for the duration of the debuff, base: see NegateSpellEffecttype Enum, limit: SPA id, max: none
+#define SE_NegateSpellEffect			382 // implemented, @Debuff, negates specific spell effect benefits for the duration of the debuff and prevent non-duration spell effect from working, base: see NegateSpellEffecttype Enum, limit: SPA id, max: none
 #define SE_SympatheticProc				383 // implemented, @Fc, On Caster, cast on spell use, base: variable proc chance on cast time, limit: spellid
 #define SE_Leap							384	// implemented - Leap effect, ie stomping leap
 #define SE_LimitSpellGroup				385	// implemented, @Ff, Spell group(s) that a spell focus can require or exclude, base1: spellgroup id, Include: Positive Exclude: Negative
diff --git a/zone/mob.h b/zone/mob.h
index 9ccf846c9..f44c715ce 100644
--- a/zone/mob.h
+++ b/zone/mob.h
@@ -298,6 +298,7 @@ public:
 		uint8 WornType = 0, int32 ticsremaining = 0, int buffslot = -1, int instrument_mod = 10,
 		bool IsAISpellEffect = false, uint16 effect_id = 0, int32 se_base = 0, int32 se_limit = 0, int32 se_max = 0);
 	void NegateSpellEffectBonuses(uint16 spell_id);
+	bool NegateSpellEffect(uint16 spell_id, int effect_id);
 	virtual float GetActSpellRange(uint16 spell_id, float range, bool IsBard = false);
 	virtual int32 GetActSpellDamage(uint16 spell_id, int32 value, Mob* target = nullptr);
 	virtual int32 GetActDoTDamage(uint16 spell_id, int32 value, Mob* target);
diff --git a/zone/spell_effects.cpp b/zone/spell_effects.cpp
index 68fa5e897..6fb4ce5e1 100644
--- a/zone/spell_effects.cpp
+++ b/zone/spell_effects.cpp
@@ -216,10 +216,19 @@ bool Mob::SpellEffect(Mob* caster, uint16 spell_id, float partial, int level_ove
 		if (GetSpellPowerDistanceMod())
 			effect_value = effect_value*GetSpellPowerDistanceMod()/100;
 
+		//Prevents effect from being applied
+		if (spellbonuses.NegateEffects) {
+			if (effect != SE_NegateSpellEffect && NegateSpellEffect(spell_id, effect)) {
+				if (caster) {
+					caster->Message(Chat::Red, "Part or all of this spell has lost its effectiveness."); //Placeholder msg, until live one is obtained.
+				}
+				continue;
+			}
+		}
+
 #ifdef SPELL_EFFECT_SPAM
 		effect_desc[0] = 0;
 #endif
-
 		switch(effect)
 		{
 			case SE_CurrentHP:	// nukes, heals; also regen/dot if a buff
@@ -8513,3 +8522,22 @@ int Mob::GetFocusRandomEffectivenessValue(int focus_base, int focus_base2, bool
 
 	return zone->random.Int(focus_base, focus_base2);
 }
+
+bool Mob::NegateSpellEffect(uint16 spell_id, int effect_id)
+{
+	//*This works for most effects, anything handled purely by the client will bypass this (ie Gate, Shadowstep)
+
+	for (int i = 0; i < GetMaxTotalSlots(); i++) {
+		//Check for any buffs containing NegateEffect
+		if (IsValidSpell(buffs[i].spellid) && IsEffectInSpell(buffs[i].spellid, SE_NegateSpellEffect) && spell_id != buffs[i].spellid) {
+			//Match each of the negate effects with the current spell effect, if found, that effect will not be applied.
+			for (int j = 0; j < EFFECT_COUNT; j++)
+			{
+				if (spells[buffs[i].spellid].base2[j] == effect_id) {
+					return true;
+				}
+			}
+		}
+	}
+	return false;
+}