diff --git a/sonic-radiance.love/datas/gamedata/battles/elements.lua b/sonic-radiance.love/datas/gamedata/battles/elements.lua
new file mode 100644
index 0000000..3ec5f5b
--- /dev/null
+++ b/sonic-radiance.love/datas/gamedata/battles/elements.lua
@@ -0,0 +1,42 @@
+return {
+    ["none"] = {
+        fullname = "None",
+        weakTo = {},
+        resists = {}
+    },
+    ["water"] = {
+        fullname = "Water",
+        weakTo = {"light"},
+        resists = {"fire", "water"}
+    },
+    ["fire"] = {
+        fullname = "Fire",
+        weakTo = {"water"},
+        resists = {"ice", "fire"}
+    },
+    ["ice"] = {
+        fullname = "Fire",
+        weakTo = {"fire"},
+        resists = {"wind", "ice"}
+    },
+    ["wind"] = {
+        fullname = "Fire",
+        weakTo = {"ice"},
+        resists = {"earth", "wind"}
+    },
+    ["earth"] = {
+        fullname = "Fire",
+        weakTo = {"wind"},
+        resists = {"light", "earth"}
+    },
+    ["light"] = {
+        fullname = "Fire",
+        weakTo = {"earth"},
+        resists = {"water", "light"}
+    },
+    ["chaos"] = {
+        fullname = "Chaos",
+        weakTo = {"chaos"},
+        resists = {}
+    }
+}
\ No newline at end of file
diff --git a/sonic-radiance.love/datas/gamedata/battles/protectypes.lua b/sonic-radiance.love/datas/gamedata/battles/protectypes.lua
new file mode 100644
index 0000000..222ce6f
--- /dev/null
+++ b/sonic-radiance.love/datas/gamedata/battles/protectypes.lua
@@ -0,0 +1,22 @@
+return {
+    ["basic"] = {
+        resistTo = {},
+        backDamage = {}
+    },
+    ["aerial"] = {
+        resistTo = {"basic"},
+        backDamage = {}
+    },
+    ["shielded"] = {
+        resistTo = {"basic", "projectile"},
+        backDamage = {}
+    },
+    ["spiked"] = {
+        resistTo = {"basic", "aerial"},
+        backDamage = {"basic", "aerial"}
+    },
+    ["backspiked"] = {
+        resistTo = {"aerial"},
+        backDamage = {"aerial"}
+    },
+}
\ No newline at end of file
diff --git a/sonic-radiance.love/datas/gamedata/characters/amy/init.lua b/sonic-radiance.love/datas/gamedata/characters/amy/init.lua
index ab50f27..0621f24 100644
--- a/sonic-radiance.love/datas/gamedata/characters/amy/init.lua
+++ b/sonic-radiance.love/datas/gamedata/characters/amy/init.lua
@@ -13,6 +13,9 @@ return {
   canGoSuper        = true,
   canBreakCraft     = false,
 
+  weakTo = {},
+  resists = {},
+
   icon = 3,
   charset = "perso",
   charId = 3,
diff --git a/sonic-radiance.love/datas/gamedata/characters/sonic/init.lua b/sonic-radiance.love/datas/gamedata/characters/sonic/init.lua
index cc1a34b..80f68cc 100644
--- a/sonic-radiance.love/datas/gamedata/characters/sonic/init.lua
+++ b/sonic-radiance.love/datas/gamedata/characters/sonic/init.lua
@@ -13,6 +13,9 @@ return {
   canGoSuper        = true,
   canBreakCraft     = false,
 
+  weakTo = {"water"},
+  resists = {"wind"},
+
   icon = 1,
   charset = "perso",
   charId = 1,
diff --git a/sonic-radiance.love/datas/gamedata/characters/tails/init.lua b/sonic-radiance.love/datas/gamedata/characters/tails/init.lua
index eca83a7..56b76a6 100644
--- a/sonic-radiance.love/datas/gamedata/characters/tails/init.lua
+++ b/sonic-radiance.love/datas/gamedata/characters/tails/init.lua
@@ -13,6 +13,9 @@ return {
   canGoSuper        = true,
   canBreakCraft     = false,
 
+  weakTo = {"light"},
+  resists = {"earth"},
+
   icon = 2,
   charset = "perso",
   charId = 2,
diff --git a/sonic-radiance.love/game/abstractmobs/character/datas.lua b/sonic-radiance.love/game/abstractmobs/character/datas.lua
index 14a4aa1..d688f71 100644
--- a/sonic-radiance.love/game/abstractmobs/character/datas.lua
+++ b/sonic-radiance.love/game/abstractmobs/character/datas.lua
@@ -7,4 +7,12 @@ function CharacterData:getCommonData()
     self.turns = self.data.turns
 end
 
+function CharacterData:getWeaknesses()
+    return self.data.weakTo
+end
+
+function CharacterData:getResistences()
+    return self.data.resists
+end
+
 return CharacterData
diff --git a/sonic-radiance.love/game/abstractmobs/ennemy.lua b/sonic-radiance.love/game/abstractmobs/ennemy.lua
index a49e55c..7005bd2 100644
--- a/sonic-radiance.love/game/abstractmobs/ennemy.lua
+++ b/sonic-radiance.love/game/abstractmobs/ennemy.lua
@@ -1,6 +1,7 @@
 local AbstractMobParent = require "game.abstractmobs.parent"
 
 local AbstractEnnemy = AbstractMobParent:extend()
+local elements = require "datas.gamedata.battles.elements"
 
 function AbstractEnnemy:new(directory, name)
   self.simplename = name
@@ -8,6 +9,16 @@ function AbstractEnnemy:new(directory, name)
   self.super.new(self)
 end
 
+function AbstractEnnemy:getWeaknesses()
+  local elementData = elements[self.data.element] or elements["none"]
+  return elementData.weakTo
+end
+
+function AbstractEnnemy:getResistences()
+  local elementData = elements[self.data.element] or elements["none"]
+  return elementData.resists
+end
+
 function AbstractEnnemy:haveProtecType(protectype)
   return utils.table.contain(self.data.protectypes, protectype)
 end
diff --git a/sonic-radiance.love/game/utils/battle/init.lua b/sonic-radiance.love/game/utils/battle/init.lua
index bbf9582..a6bde26 100644
--- a/sonic-radiance.love/game/utils/battle/init.lua
+++ b/sonic-radiance.love/game/utils/battle/init.lua
@@ -1,5 +1,6 @@
 local BattleUtils = {}
 local CONSTS = require "datas.consts.battle"
+local protectypes = require "datas.gamedata.battles.protectypes"
 
 function BattleUtils.computeLaunchingDamages(base, stats, isSpecial)
     local damages = base / CONSTS.DAMAGE.DIVISOR
@@ -26,11 +27,32 @@ function BattleUtils.computeReceivingDamages(base, stats, isSpecial, isDefending
     return damages
 end
 
-function BattleUtils.applyProtectTypes(value, type, protectype)
-    if (utils.table.contain(protectype, "aerial") and type == "basic") then
-        value = value * CONSTS.ATKWRONGTYPE
-      end    
-      return value
+function BattleUtils.applyProtectTypes(value, type, protectypeList)
+    for _, protectype in ipairs(protectypeList) do
+        local protecttypeData = protectypes[protectype]
+        if protecttypeData ~= nil then
+            if (utils.table.contain(protecttypeData.resistTo, type)) then
+                value = value * CONSTS.ATKWRONGTYPE
+            end
+        else
+            core.debug:warning("battleutils", "protectype " .. protectype .. " doesn't exists ")
+        end
+    end
+    return value
+end
+
+function BattleUtils.applyWeaknesses(damages, element, weaknessList)
+    if (utils.table.contain(weaknessList, element)) then
+        damages = damages * 1.2
+    end
+    return damages
+end
+
+function BattleUtils.applyResistences(damages, element, resistsList)
+    if (utils.table.contain(resistsList, element)) then
+        damages = damages * 0.8
+    end
+    return damages
 end
 
 function BattleUtils.isAttackSuccess(statutList)
diff --git a/sonic-radiance.love/scenes/battlesystem/controllers/fighters/parent.lua b/sonic-radiance.love/scenes/battlesystem/controllers/fighters/parent.lua
index bafa8d9..ed7e734 100644
--- a/sonic-radiance.love/scenes/battlesystem/controllers/fighters/parent.lua
+++ b/sonic-radiance.love/scenes/battlesystem/controllers/fighters/parent.lua
@@ -1,6 +1,5 @@
 local FighterParent = Object:extend()
 
-local CONST = require "datas.consts.battle"
 local battleutils = require "game.utils.battle"
 
 function FighterParent:new(owner, isHero, id)
@@ -85,6 +84,8 @@ end
 function FighterParent:receiveDamage(value, type, element, isSpecial, fromWho)
   local damages = battleutils.computeReceivingDamages(value, self:getStats(), isSpecial, self.isDefending)
   damages = battleutils.applyProtectTypes(damages, type, self.abstract:getProtecTypes())
+  damages = battleutils.applyResistences(damages, element, self.abstract:getResistences())
+  damages = battleutils.applyWeaknesses(damages, element, self.abstract:getWeaknesses())
 
   if (battleutils.isAttackSuccess(nil)) then
     self:applyDamage(damages)