diff --git a/src/game/SpellAuras.cpp b/src/game/SpellAuras.cpp
index 370ea566b..8242e6fc3 100644
--- a/src/game/SpellAuras.cpp
+++ b/src/game/SpellAuras.cpp
@@ -330,7 +330,7 @@ pAuraHandler AuraHandler[TOTAL_AURAS]=
     &Aura::HandleNoImmediateEffect,                         //277 SPELL_AURA_MOD_MAX_AFFECTED_TARGETS Use SpellClassMask for spell select
     &Aura::HandleNULL,                                      //278 SPELL_AURA_MOD_DISARM_RANGED disarm ranged weapon
     &Aura::HandleNULL,                                      //279 visual effects? 58836 and 57507
-    &Aura::HandleNULL,                                      //280 SPELL_AURA_MOD_TARGET_ARMOR_PCT
+    &Aura::HandleNoImmediateEffect,                         //280 SPELL_AURA_MOD_TARGET_ARMOR_PCT       implemented in Unit::CalcArmorReducedDamage
     &Aura::HandleNULL,                                      //281 SPELL_AURA_MOD_HONOR_GAIN
     &Aura::HandleAuraIncreaseBaseHealthPercent,             //282 SPELL_AURA_INCREASE_BASE_HEALTH_PERCENT
     &Aura::HandleNoImmediateEffect,                         //283 SPELL_AURA_MOD_HEALING_RECEIVED       implemented in Unit::SpellHealingBonus
diff --git a/src/game/Unit.cpp b/src/game/Unit.cpp
index 0aea5fd13..9b3cac73b 100644
--- a/src/game/Unit.cpp
+++ b/src/game/Unit.cpp
@@ -1565,6 +1565,7 @@ uint32 Unit::CalcArmorReducedDamage(Unit* pVictim, const uint32 damage)
 {
     uint32 newdamage = 0;
     float armor = pVictim->GetArmor();
+
     // Ignore enemy armor by SPELL_AURA_MOD_TARGET_RESISTANCE aura
     armor += GetTotalAuraModifierByMiscMask(SPELL_AURA_MOD_TARGET_RESISTANCE, SPELL_SCHOOL_MASK_NORMAL);
 
@@ -1572,19 +1573,24 @@ uint32 Unit::CalcArmorReducedDamage(Unit* pVictim, const uint32 damage)
     if (GetTypeId()==TYPEID_PLAYER)
         armor *= 1.0f - ((Player*)this)->GetRatingBonusValue(CR_ARMOR_PENETRATION) / 100.0f;
 
-    if (armor < 0.0f) armor=0.0f;
+    // Ignore enemy armor by SPELL_AURA_MOD_TARGET_ARMOR_PCT
+    armor *= 1.0f - GetTotalAuraModifier(SPELL_AURA_MOD_TARGET_ARMOR_PCT) / 100.0f;
+
+    if (armor < 0.0f)
+        armor = 0.0f;
 
     float levelModifier = getLevel();
-    if ( levelModifier > 59 )
+    if (levelModifier > 59)
         levelModifier = levelModifier + (4.5f * (levelModifier-59));
 
     float tmpvalue = 0.1f * armor / (8.5f * levelModifier + 40);
     tmpvalue = tmpvalue/(1.0f + tmpvalue);
 
-    if(tmpvalue < 0.0f)
+    if (tmpvalue < 0.0f)
         tmpvalue = 0.0f;
-    if(tmpvalue > 0.75f)
+    if (tmpvalue > 0.75f)
         tmpvalue = 0.75f;
+
     newdamage = uint32(damage - (damage * tmpvalue));
 
     return (newdamage > 1) ? newdamage : 1;
diff --git a/src/shared/revision_nr.h b/src/shared/revision_nr.h
index 5b5dad3e2..2f244a12e 100644
--- a/src/shared/revision_nr.h
+++ b/src/shared/revision_nr.h
@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "8453"
+ #define REVISION_NR "8454"
 #endif // __REVISION_NR_H__