diff --git a/less/character-sheet.less b/less/character-sheet.less
index 7cdc0d8..ebf94bf 100644
--- a/less/character-sheet.less
+++ b/less/character-sheet.less
@@ -639,12 +639,45 @@
         flex-direction: column;
     }
 
+    .defenseBox {
+        position: absolute;
+        bottom: 5px;
+        right: 10px
+    }
+
     .defenseTable {
-        border-radius: 10px;
+        border-radius: 5px;
+        text-shadow: -1px -1px 0 #000, 1px -1px 0 #000, -1px 1px 0 #000, 1px 1px 0 #000;
 
         th {
             border: 2px black;
-            padding: 5px;
+            padding: 3.5px;
+            padding-right: 4.5px;
+            font-size: 12px;
         }
     }
+
+    .effectiveness0 {
+        background-color: black;
+        color: yellow;
+        // text-shadow: none;
+    }
+
+    .effectiveness½ {
+        background-color: red;
+        color: yellow;
+        // text-shadow: none;
+    }
+
+    .effectiveness1 {
+        background-color: white;
+        color: white;
+        text-shadow: none;
+    }
+
+    .effectiveness½ {
+        background-color: green;
+        color: yellow;
+        // text-shadow: none;
+    }
 }
diff --git a/modules/sheets/pokemonCharacterSheet.js b/modules/sheets/pokemonCharacterSheet.js
index 2c08bb5..cf5d75f 100644
--- a/modules/sheets/pokemonCharacterSheet.js
+++ b/modules/sheets/pokemonCharacterSheet.js
@@ -1,6 +1,332 @@
 const api = foundry.applications.api;
 const sheets = foundry.applications.sheets;
 
+effectivenessChart = {
+  "normal": {
+    "normal": 1,
+    "fire": 1,
+    "water": 1,
+    "electric": 1,
+    "grass": 1,
+    "ice": 1,
+    "fighting": 1,
+    "poison": 1,
+    "ground": 1,
+    "flying": 1,
+    "psychic": 1,
+    "bug": 1,
+    "rock": 0.5,
+    "ghost": 0,
+    "dragon": 1,
+    "dark": 1,
+    "steel": 0.5
+  },
+  "fire": {
+    "normal": 1,
+    "fire": 0.5,
+    "water": 0.5,
+    "electric": 1,
+    "grass": 2,
+    "ice": 2,
+    "fighting": 1,
+    "poison": 1,
+    "ground": 1,
+    "flying": 1,
+    "psychic": 1,
+    "bug": 2,
+    "rock": 0.5,
+    "ghost": 1,
+    "dragon": 0.5,
+    "dark": 1,
+    "steel": 2
+  },
+  "water": {
+    "normal": 1,
+    "fire": 2,
+    "water": 0.5,
+    "electric": 1,
+    "grass": 0.5,
+    "ice": 1,
+    "fighting": 1,
+    "poison": 1,
+    "ground": 2,
+    "flying": 1,
+    "psychic": 1,
+    "bug": 1,
+    "rock": 2,
+    "ghost": 1,
+    "dragon": 0.5,
+    "dark": 1,
+    "steel": 1
+  },
+  "electric": {
+    "normal": 1,
+    "fire": 1,
+    "water": 2,
+    "electric": 0.5,
+    "grass": 0.5,
+    "ice": 1,
+    "fighting": 1,
+    "poison": 1,
+    "ground": 0,
+    "flying": 2,
+    "psychic": 1,
+    "bug": 1,
+    "rock": 1,
+    "ghost": 1,
+    "dragon": 0.5,
+    "dark": 1,
+    "steel": 1
+  },
+  "grass": {
+    "normal": 1,
+    "fire": 0.5,
+    "water": 2,
+    "electric": 1,
+    "grass": 0.5,
+    "ice": 1,
+    "fighting": 1,
+    "poison": 0.5,
+    "ground": 2,
+    "flying": 0.5,
+    "psychic": 1,
+    "bug": 0.5,
+    "rock": 2,
+    "ghost": 1,
+    "dragon": 0.5,
+    "dark": 1,
+    "steel": 0.5
+  },
+  "ice": {
+    "normal": 1,
+    "fire": 0.5,
+    "water": 0.5,
+    "electric": 1,
+    "grass": 2,
+    "ice": 0.5,
+    "fighting": 1,
+    "poison": 1,
+    "ground": 2,
+    "flying": 2,
+    "psychic": 1,
+    "bug": 1,
+    "rock": 1,
+    "ghost": 1,
+    "dragon": 2,
+    "dark": 1,
+    "steel": 0.5
+  },
+  "fighting": {
+    "normal": 2,
+    "fire": 1,
+    "water": 1,
+    "electric": 1,
+    "grass": 1,
+    "ice": 2,
+    "fighting": 1,
+    "poison": 0.5,
+    "ground": 1,
+    "flying": 0.5,
+    "psychic": 0.5,
+    "bug": 0.5,
+    "rock": 2,
+    "ghost": 0,
+    "dragon": 1,
+    "dark": 2,
+    "steel": 2
+  },
+  "poison": {
+    "normal": 1,
+    "fire": 1,
+    "water": 1,
+    "electric": 1,
+    "grass": 2,
+    "ice": 1,
+    "fighting": 1,
+    "poison": 0.5,
+    "ground": 0.5,
+    "flying": 1,
+    "psychic": 1,
+    "bug": 1,
+    "rock": 0.5,
+    "ghost": 0.5,
+    "dragon": 1,
+    "dark": 1,
+    "steel": 0
+  },
+  "ground": {
+    "normal": 1,
+    "fire": 2,
+    "water": 1,
+    "electric": 2,
+    "grass": 0.5,
+    "ice": 1,
+    "fighting": 1,
+    "poison": 2,
+    "ground": 1,
+    "flying": 0,
+    "psychic": 1,
+    "bug": 0.5,
+    "rock": 2,
+    "ghost": 1,
+    "dragon": 1,
+    "dark": 1,
+    "steel": 2
+  },
+  "flying": {
+    "normal": 1,
+    "fire": 1,
+    "water": 1,
+    "electric": 0.5,
+    "grass": 2,
+    "ice": 1,
+    "fighting": 2,
+    "poison": 1,
+    "ground": 1,
+    "flying": 1,
+    "psychic": 1,
+    "bug": 2,
+    "rock": 0.5,
+    "ghost": 1,
+    "dragon": 1,
+    "dark": 1,
+    "steel": 0.5
+  },
+  "psychic": {
+    "normal": 1,
+    "fire": 1,
+    "water": 1,
+    "electric": 1,
+    "grass": 1,
+    "ice": 1,
+    "fighting": 2,
+    "poison": 2,
+    "ground": 1,
+    "flying": 1,
+    "psychic": 0.5,
+    "bug": 1,
+    "rock": 1,
+    "ghost": 1,
+    "dragon": 1,
+    "dark": 0,
+    "steel": 0.5
+  },
+  "bug": {
+    "normal": 1,
+    "fire": 0.5,
+    "water": 1,
+    "electric": 1,
+    "grass": 2,
+    "ice": 1,
+    "fighting": 0.5,
+    "poison": 0.5,
+    "ground": 1,
+    "flying": 0.5,
+    "psychic": 2,
+    "bug": 1,
+    "rock": 1,
+    "ghost": 0.5,
+    "dragon": 1,
+    "dark": 2,
+    "steel": 0.5
+  },
+  "rock": {
+    "normal": 1,
+    "fire": 2,
+    "water": 1,
+    "electric": 1,
+    "grass": 1,
+    "ice": 2,
+    "fighting": 0.5,
+    "poison": 1,
+    "ground": 0.5,
+    "flying": 2,
+    "psychic": 1,
+    "bug": 2,
+    "rock": 1,
+    "ghost": 1,
+    "dragon": 1,
+    "dark": 1,
+    "steel": 0.5
+  },
+  "ghost": {
+    "normal": 0,
+    "fire": 1,
+    "water": 1,
+    "electric": 1,
+    "grass": 1,
+    "ice": 1,
+    "fighting": 1,
+    "poison": 1,
+    "ground": 1,
+    "flying": 1,
+    "psychic": 2,
+    "bug": 1,
+    "rock": 1,
+    "ghost": 2,
+    "dragon": 1,
+    "dark": 0.5,
+    "steel": 0.5
+  },
+  "dragon": {
+    "normal": 1,
+    "fire": 1,
+    "water": 1,
+    "electric": 1,
+    "grass": 1,
+    "ice": 1,
+    "fighting": 1,
+    "poison": 1,
+    "ground": 1,
+    "flying": 1,
+    "psychic": 1,
+    "bug": 1,
+    "rock": 1,
+    "ghost": 1,
+    "dragon": 2,
+    "dark": 1,
+    "steel": 0.5
+  },
+  "dark": {
+    "normal": 1,
+    "fire": 1,
+    "water": 1,
+    "electric": 1,
+    "grass": 1,
+    "ice": 1,
+    "fighting": 0.5,
+    "poison": 1,
+    "ground": 1,
+    "flying": 1,
+    "psychic": 2,
+    "bug": 1,
+    "rock": 1,
+    "ghost": 2,
+    "dragon": 1,
+    "dark": 0.5,
+    "steel": 0.5
+  },
+  "steel": {
+    "normal": 1,
+    "fire": 0.5,
+    "water": 0.5,
+    "electric": 0.5,
+    "grass": 1,
+    "ice": 2,
+    "fighting": 1,
+    "poison": 1,
+    "ground": 1,
+    "flying": 1,
+    "psychic": 1,
+    "bug": 1,
+    "rock": 2,
+    "ghost": 1,
+    "dragon": 1,
+    "dark": 1,
+    "steel": 0.5
+  }
+}
+
 export default class pokemonCharacterSheet extends api.HandlebarsApplicationMixin(sheets.ActorSheetV2) {
 
     sheetContext = {};
@@ -84,13 +410,25 @@ export default class pokemonCharacterSheet extends api.HandlebarsApplicationMixi
             context.system.spArmorClass += 2;
         }
 
-        context.defenses = ["1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1"]
+        context.defenses = context.types.map(type => this.calcEffectiveness(context, type));
 
         context.system.speed = 30+5*context.system.stats.speed;
 
         return context;
     }
 
+    calcEffectiveness(context, type) {
+        effectiveness = 1
+
+        effectiveness *= effectivenessChart[type][context.system.type1]
+
+        if (context.system.type2 != "") {
+            effectiveness *= effectivenessChart[type][context.system.type2]
+        }
+
+        return effectiveness
+    }
+
     /** @override */
     _onRender(context, options) {
         const tabs = new foundry.applications.ux.Tabs({navSelector: ".tabs", contentSelector: ".content", initial: this.tab});
diff --git a/pokemon.css b/pokemon.css
index c5ac424..55e0370 100644
--- a/pokemon.css
+++ b/pokemon.css
@@ -533,10 +533,35 @@
   display: flex;
   flex-direction: column;
 }
+.pokemon.sheet.characterSheet .defenseBox {
+  position: absolute;
+  bottom: 5px;
+  right: 10px;
+}
 .pokemon.sheet.characterSheet .defenseTable {
-  border-radius: 10px;
+  border-radius: 5px;
+  text-shadow: -1px -1px 0 #000, 1px -1px 0 #000, -1px 1px 0 #000, 1px 1px 0 #000;
 }
 .pokemon.sheet.characterSheet .defenseTable th {
   border: 2px black;
-  padding: 5px;
+  padding: 3.5px;
+  padding-right: 4.5px;
+  font-size: 12px;
+}
+.pokemon.sheet.characterSheet .effectiveness0 {
+  background-color: black;
+  color: yellow;
+}
+.pokemon.sheet.characterSheet .effectiveness½ {
+  background-color: red;
+  color: yellow;
+}
+.pokemon.sheet.characterSheet .effectiveness1 {
+  background-color: white;
+  color: white;
+  text-shadow: none;
+}
+.pokemon.sheet.characterSheet .effectiveness½ {
+  background-color: green;
+  color: yellow;
 }
diff --git a/system.json b/system.json
index 3103d9f..2239d75 100644
--- a/system.json
+++ b/system.json
@@ -1,5 +1,5 @@
 {
-    "version": "0.1.9",
+    "version": "0.1.10",
     "id": "pokemon",
     "title": "Pokémon TTRPG",
     "description": "A Pokémon TTRPG",
diff --git a/system.zip b/system.zip
index 2a53ff5..44046e4 100644
Binary files a/system.zip and b/system.zip differ
diff --git a/templates/partials/character-sheet-character.hbs b/templates/partials/character-sheet-character.hbs
index 1ac19f4..35be469 100644
--- a/templates/partials/character-sheet-character.hbs
+++ b/templates/partials/character-sheet-character.hbs
@@ -58,6 +58,8 @@
         </div>
     </div>
     <div class="defenseBox">
+        <span class="header">Defenses</span>
+
         <table class="defenseTable">
             <tr>
                 {{#each types}}