diff --git a/Modules/Data/Constants.lua b/Modules/Data/Constants.lua
index 679422a..28ab776 100755
--- a/Modules/Data/Constants.lua
+++ b/Modules/Data/Constants.lua
@@ -351,6 +351,18 @@ Data.Aura = {
         [25894] = (ECS.IsClassic and 1 or nil), -- Greater Blessing of Wisdom rank 1
         [25918] = (ECS.IsClassic and 1 or nil), -- Greater Blessing of Wisdom rank 2
     },
+    ReduceTargetArmor = {
+        [37174] = (ECS.IsTBC and 1000 or nil), -- Perceived Weakness
+        [37482] = (ECS.IsTBC and 600 or nil), -- Exploited Weakness
+        [40477] = (ECS.IsTBC and 300 or nil), -- Forceful Strike
+        [42976] = (ECS.IsTBC and 400 or nil), -- Executioner
+        [43817] = (ECS.IsTBC and 1000 or nil), -- Focused Assault
+        [47216] = 1092, -- Piercing Fangs
+        [54678] = 50000, -- Brute Force
+        [461252] = 2000, -- Shadowflame Fury
+        [1231894] = 1000, -- Ferocity of the Crocolisk
+        [1231896] = 500, -- Brilliance of Mr. Bigglesworth
+    },
     SpellCrit = {
         [24907] = (ECS.IsClassic and nil or 5), -- Moonkin Aura
         [29177] = 6, -- Elemental Devastation Rank 2
diff --git a/Modules/Data/Data.lua b/Modules/Data/Data.lua
index 4d1f3fe..62a574c 100755
--- a/Modules/Data/Data.lua
+++ b/Modules/Data/Data.lua
@@ -24,7 +24,8 @@ dataFunctionRefs = {
     ["MeleeCritChance"] = function() return Data:MeleeCrit() end,
     ["Expertise"] = function() return ECS.IsClassic and 0 or Data:GetExpertise() end,
     ["ExpertiseRating"] = function() return ECS.IsClassic and 0 or Data:GetExpertiseRating() end,
-    ["MeleeArmorPenetration"] = function() return Data:GetArmorPenetration() end,
+    ["MeleeArmorPenetrationFlat"] = function() return Data:GetArmorPenetrationFlat() end,
+    ["MeleeArmorPenetrationPercentage"] = function() return ECS.IsWotlk and Data:GetArmorPenetrationPercentage() or 0 end,
     ["MeleeArmorPenetrationRating"] = function() return ECS.IsWotlk and Data:GetArmorPenetrationRating() or 0 end,
     ["MeleeHitRating"] = function() return ECS.IsClassic and 0 or Data:MeleeHitRating() end,
     ["MeleeHitBonus"] = function() return Data:MeleeHitBonus() end,
diff --git a/Modules/Data/General.lua b/Modules/Data/General.lua
index d8c8f7e..cbc65d5 100644
--- a/Modules/Data/General.lua
+++ b/Modules/Data/General.lua
@@ -3,6 +3,8 @@ local Data = ECSLoader:ImportModule("Data")
 ---@type DataUtils
 local DataUtils = ECSLoader:ImportModule("DataUtils")
 
+local _, _, classId = UnitClass("player")
+local playerLevel = UnitLevel("player")
 
 ---@return string
 function Data:GetMovementSpeed()
@@ -20,4 +22,65 @@ function Data:GetMovementSpeed()
 
     currentSpeed = currentSpeed / 7 * 100
     return DataUtils:Round(currentSpeed, 0) .. "%"
+end
+
+---@return number
+function Data:GetArmorPenetrationFlat()
+    local armorPenetration = 0
+
+    if classId == Data.ROGUE and not ECS.IsWotlk then
+        armorPenetration = armorPenetration + playerLevel * 5/3 * DataUtils:GetActiveTalentSpell({14171,14172,14173}) -- Serrated Blades
+    end
+
+    local i = 1
+    repeat
+        local aura = C_UnitAuras.GetBuffDataByIndex("player", i)
+        if aura and aura.spellId then
+            armorPenetration = armorPenetration + (Data.Aura.ReduceTargetArmor[aura.spellId] or 0)
+            if not ECS.IsWotlk then
+                if aura.spellId == 26481 then
+                    armorPenetration = armorPenetration + 200 * aura.applications -- Insight of the Qiraji
+                elseif aura.spellId == 21153 then
+                    armorPenetration = armorPenetration + 700 * aura.applications -- Bonereaver's Edge
+                elseif aura.spellId == 38307 then
+                    armorPenetration = armorPenetration + 435 * aura.applications -- The Dark of Night
+                end
+            end
+        end
+        i = i + 1
+    until (not aura)
+
+    return DataUtils:Round(armorPenetration, 2)
+end
+
+---@return string
+function Data:GetArmorPenetrationPercentage()
+    local armorPenetration = 0
+
+    if ECS.IsWotlk then
+        armorPenetration = GetArmorPenetration()
+        if classId == Data.WARRIOR then
+            local _, isActive = GetShapeshiftFormInfo(1)
+            if isActive then
+                armorPenetration = armorPenetration + 10 -- 10% from Battle Stance
+            end
+            -- TODO: mace specialization
+        elseif classId == Data.ROGUE then
+            armorPenetration = armorPenetration + 3 * DataUtils:GetActiveTalentSpell({14171,14172,14173}) -- Serrated Blades
+            -- TODO: mace specialization
+        elseif classId == Data.DEATHKNIGHT then
+            armorPenetration = armorPenetration + 2 * DataUtils:GetActiveTalentSpell({61274,61275,61276,61277,61278}) -- Blood Gorged
+        end
+    end
+
+    return DataUtils:Round(armorPenetration, 2) .. "%"
+end
+
+---@return number
+function Data:GetArmorPenetrationRating()
+    local arpen = 0
+    if ECS.IsWotlk then
+        arpen = GetCombatRating(CR_ARMOR_PENETRATION)
+    end
+    return arpen
 end
\ No newline at end of file
diff --git a/Modules/Data/Melee.lua b/Modules/Data/Melee.lua
index 5fa29e9..910e695 100755
--- a/Modules/Data/Melee.lua
+++ b/Modules/Data/Melee.lua
@@ -220,30 +220,6 @@ function Data:GetExpertiseRating()
     return DataUtils:Round(expertiseRating, 0)
 end
 
----@return string
-function Data:GetArmorPenetration()
-    local armorPenetration = GetArmorPenetration()
-
-    if ECS.IsWotlk and classId == Data.WARRIOR then
-        local _, isActive = GetShapeshiftFormInfo(1)
-        if isActive then
-            armorPenetration = armorPenetration + 10 -- 10% from Battle Stance
-        end
-    end
-
-    if classId == Data.DEATHKNIGHT then
-        armorPenetration = armorPenetration + 2 * DataUtils:GetActiveTalentSpell({61274,61275,61276,61277,61278}) -- Blood Gorged
-    end
-
-    return DataUtils:Round(armorPenetration, 2) .. "%"
-end
-
----@return number
-function Data:GetArmorPenetrationRating()
-    local armorPenetrationRating = GetCombatRating(CR_ARMOR_PENETRATION)
-    return DataUtils:Round(armorPenetrationRating, 0)
-end
-
 ---@return number
 function Data:GetMeleeHasteRating()
     local hasteRating = GetCombatRating(CR_HASTE_MELEE)
@@ -254,5 +230,4 @@ end
 function Data:GetMeleeHasteBonus()
     local hasteBonus = GetCombatRatingBonus(CR_HASTE_MELEE)
     return DataUtils:Round(hasteBonus, 2) .. "%"
-end
-
+end
\ No newline at end of file