diff --git a/common/spdat.h b/common/spdat.h
index 55af388b5..9061e8725 100644
--- a/common/spdat.h
+++ b/common/spdat.h
@@ -839,7 +839,7 @@ typedef enum {
 #define SE_SuspendPet					151	// implemented, @Pet, allow caster to have an extra suspended pet, base: 0=no buffs/items 1=buffs+items, limit: none, max: none
 #define SE_TemporaryPets				152	// implemented
 #define SE_BalanceHP					153 // implemented
-#define SE_DispelDetrimental			154 // implemented
+#define SE_DispelDetrimental			154 // implemented, @Dispel only beneficial effects on a target, base: pct chance (950=95%), limit:none, max:none
 #define SE_SpellCritDmgIncrease			155 // implemented - no known live spells use this currently
 #define SE_IllusionCopy					156	// implemented - Deception
 #define SE_SpellDamageShield			157	// implemented - Petrad's Protection
@@ -894,7 +894,7 @@ typedef enum {
 #define SE_AETaunt						206	// implemented
 #define SE_FleshToBone					207	// implemented
 //#define SE_PurgePoison				208	// not used
-#define SE_DispelBeneficial				209 // implemented
+#define SE_DispelBeneficial				209 // implemented, @Dispel only beneficial effects on a target, base: pct chance (950=95%), limit:none, max:none
 #define SE_PetShield					210	// implmented, @ShieldAbility, allows pet to 'shield' owner for 50 pct of damage taken for a duration, base: Time multiplier 1=12 seconds, 2=24 ect, limit: mitigation on pet owner override (not on live), max: mitigation on pet overide (not on live) 
 #define SE_AEMelee						211	// implemented TO DO: Implement to allow NPC use (client only atm).
 #define SE_FrenziedDevastation			212	// implemented - increase spell criticals + all DD spells cast 2x mana.
diff --git a/zone/mob.h b/zone/mob.h
index 098d19dac..40967aa72 100644
--- a/zone/mob.h
+++ b/zone/mob.h
@@ -346,6 +346,7 @@ public:
 	uint16 CastingSpellID() const { return casting_spell_id; }
 	bool DoCastingChecks();
 	bool TryDispel(uint8 caster_level, uint8 buff_level, int level_modifier);
+	bool TryDispelBeneficialOrDetrimental(uint8 caster_level, uint8 buff_level, int chance);
 	bool TrySpellProjectile(Mob* spell_target,  uint16 spell_id, float speed = 1.5f);
 	void ResourceTap(int32 damage, uint16 spell_id);
 	void TryTriggerThreshHold(int32 damage, int effect_id, Mob* attacker);
diff --git a/zone/spell_effects.cpp b/zone/spell_effects.cpp
index e7e054302..6abccbfa7 100644
--- a/zone/spell_effects.cpp
+++ b/zone/spell_effects.cpp
@@ -7057,15 +7057,6 @@ uint16 Mob::GetSpellEffectResistChance(uint16 spell_id)
 
 bool Mob::TryDispel(uint8 caster_level, uint8 buff_level, int level_modifier){
 
-	/*Live 5-20-14 Patch Note: Updated all spells which use Remove Detrimental and
-	Cancel Beneficial spell effects to use a new method. The chances for those spells to
-	affect their targets have not changed unless otherwise noted.*/
-
-	/*This should provide a somewhat accurate conversion between pre 5/14 base values and post.
-	until more information is avialble - Kayen*/
-	if (level_modifier >= 100)
-		level_modifier = level_modifier/100;
-
 	//Dispels - Check level of caster agianst buffs level (level of the caster who cast the buff)
 	//Effect value of dispels are treated as a level modifier.
 	//Values for scaling were obtain from live parses, best estimates.
@@ -7092,6 +7083,32 @@ bool Mob::TryDispel(uint8 caster_level, uint8 buff_level, int level_modifier){
 		return false;
 }
 
+bool Mob::TryDispelBeneficialOrDetrimental(uint8 caster_level, uint8 buff_level, int chance) {
+
+	/*
+		Used in SPA 154 and SPA 209 to specifically dispel only beneficial or only detrimental spells.
+		Formula derived from live parsing.
+		Baseline chance is 'base' / 10, (ie. 950/10 = 95%)
+		Chance receives a penality of 0.5% per level, for each level the 'caster of the buff/debuff' is above the caster of the dispel.
+		There is no bonus percent chance for trying to dispel buff/debuffs cast by mobs lower level than you.
+
+		Ie. Lv 69 Shaman Casts 'Pure Spirit' which has 95% chance to remove deterimental on a debuff cast by a level 85 raid mob. 85-69= 16, 
+		then 16 x 0.5 = 8% penality, thus actual chance to remove is going to be 95-8 = 87%
+	*/
+
+	int dispel_chance = chance;
+	int level_diff = caster_level - buff_level;
+
+	if (level_diff < 0) {
+		dispel_chance += level_diff * 5;
+	}
+
+	if (zone->random.Int(1,1000) <= dispel_chance)
+		return true;
+	else
+		return false;
+}
+
 
 bool Mob::ImprovedTaunt(){