diff --git a/Java-Knight/src/main/java/org/project/entity/enemies/Dragon.java b/Java-Knight/src/main/java/org/project/entity/enemies/Dragon.java
new file mode 100644
index 0000000..bf7ebdf
--- /dev/null
+++ b/Java-Knight/src/main/java/org/project/entity/enemies/Dragon.java
@@ -0,0 +1,52 @@
+package org.project.entity.enemies;
+
+import org.project.constants.gameConstant.AttackPowerUp;
+import org.project.constants.gameConstant.EntityState;
+import org.project.entity.Entity;
+import org.project.entity.players.Player;
+import org.project.item.Accessory.Costume;
+import org.project.item.Accessory.Shield;
+import org.project.item.Accessory.Weapon;
+import org.project.item.Item;
+import org.project.item.KeyItem;
+
+import java.util.ArrayList;
+
+public class Dragon extends Enemy {
+    public Dragon (String name, int maxHealth, int health, long money, int baseDamage, EntityState state, Weapon weapon,
+                    Shield shield, Costume costume, ArrayList<Item> inventory, int defenseBonus, boolean isDefending,
+                    int healAmount, int stamina, int maxStamina) {
+
+        super(name, maxHealth, health, money, baseDamage, state, weapon, shield, costume, inventory, defenseBonus, isDefending, healAmount, stamina, maxStamina);
+
+        this.Key = new KeyItem("Dragon Key", this);
+    }
+
+    public Dragon() {
+        this("Dragon", 5000, 5000, 0, 100, EntityState.ALIVE, null, null, null, new ArrayList<>(){}, 50, false, 50, 500, 500);
+    }
+
+    @Override
+    public void DropLoot(Player player) {
+        Key.Owner = player;
+        player.AddToInventory(Key);
+    }
+
+    @Override
+    public void SpecialAbility(Entity entity) {
+        int curHealth = entity.Health;
+        ModifyStamina(SpecialAbilityStamina, false);
+        Damage(entity, GetDamage(), new AttackPowerUp[]{AttackPowerUp.INEVITABLE});
+        Heal(curHealth - entity.Health);
+    }
+
+    @Override
+    public String GetSpecialAbilityDescription(Entity entity) {
+        return "Vampire will suck the blood out of " + entity.Name + " and heal themselves while hurting the enemy";
+    }
+
+    @Override
+    public String GetSpecialAbilityResultDescription(Entity entity) {
+        return "Vampire attacked " + entity.Name + " and sucked his blood out of his veins. He seems more powerful";
+    }
+}
diff --git a/Java-Knight/src/main/java/org/project/entity/enemies/Enemy.java b/Java-Knight/src/main/java/org/project/entity/enemies/Enemy.java
index e019acb..c8d983c 100644
--- a/Java-Knight/src/main/java/org/project/entity/enemies/Enemy.java
+++ b/Java-Knight/src/main/java/org/project/entity/enemies/Enemy.java
@@ -1,34 +1,103 @@
 package org.project.entity.enemies;
 
-import org.project.item.weapons.Weapon;
+import org.project.Interface.IDamageable;
+import org.project.constants.gameConstant.AttackPowerUp;
+import org.project.constants.gameConstant.EntityState;
+import org.project.constants.gameConstant.FightMoves;
+import org.project.constants.gameConstant.ItemClass;
+import org.project.entity.Entity;
+import org.project.entity.players.Player;
+import org.project.item.Accessory.Costume;
+import org.project.item.Accessory.Shield;
+import org.project.item.Accessory.Weapon;
+import org.project.item.Item;
+import org.project.item.KeyItem;
 
-// TODO: UPDATE IMPLEMENTATION
-public abstract class Enemy {
-    Weapon weapon;
-    private int hp;
-    private int mp;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Objects;
+import java.util.Random;
 
-    public Enemy(int hp, int mp, Weapon weapon) {
-        this.hp = hp;
-        this.mp = mp;
+public abstract class Enemy extends Entity {
+    protected KeyItem Key;
 
-        this.weapon = weapon;
+    public Enemy (String name, int maxHealth, int health, long money, int baseDamage, EntityState state, Weapon weapon,
+                   Shield shield, Costume costume, ArrayList<Item> inventory, int defenseBonus, boolean isDefending,
+                   int healAmount, int stamina, int maxStamina) {
+
+        super(name, maxHealth, health, stamina, maxStamina, money, baseDamage, state, weapon, shield, costume, inventory, defenseBonus, isDefending, healAmount);
+
+        Key = new KeyItem(null, this);
+    }
+
+    protected Enemy() {
+        super();
+    }
+
+    public void DropLoot(Player player) {
+        Random random = new Random();
+
+        for (Item item : Inventory) {
+            int change = random.nextInt(2);
+
+            if (change == 0) {
+                player.AddToInventory(item);
+            }
+        }
+
+        ArrayList<Item> keys = player.GetInventoryByClass(ItemClass.KEY);
+        if (keys.stream().noneMatch(obj -> Objects.equals(obj.getName(), Key.getName()))) {
+            int chance = random.nextInt(5);
+
+            if (chance == 0) {
+                Key.Owner = player;
+                player.AddToInventory(Key);
+            }
+        }
+
+        player.ModifyMoney(GetMoney(), true);
+    }
+
+    public void PlayRound(Player player) {
+        ArrayList<FightMoves> moves = GetAvailableMoves();
+        Random random = new Random();
+        int change = random.nextInt(4);
+
+        if (change == 0 && moves.contains(FightMoves.HEAL)) HealMove();
+        else if (change == 1 && moves.contains(FightMoves.DEFEND)) defend();
+        else if (moves.contains(FightMoves.SPECIAL)) SpecialAbility(player);
+        else if (moves.contains(FightMoves.HEAVY_ATTACK)) HeavyAttack(player);
+        else LightAttack(player);
     }
 
     @Override
-    public void takeDamage(int damage) {
-        hp -= damage;
+    public void LightAttack(IDamageable target) {
+        int damage = GetDamage();
+
+        Damage(target, (int)(damage * 0.4), new AttackPowerUp[]{});
+        ModifyStamina(MaxStamina/8, true);
     }
 
-    public int getHp() {
-        return hp;
+    @Override
+    public void HeavyAttack(IDamageable target) {
+        int damage = GetDamage();
+        ModifyStamina(HeavyAttackStamina, false);
+
+        Damage(target, (int)(damage * 0.9), new AttackPowerUp[]{});
     }
 
-    public int getMp() {
-        return mp;
+    @Override
+    public void HealMove() {
+        super.HealMove();
+        ModifyStamina(MaxStamina/4, true);
     }
 
-    public Weapon getWeapon() {
-        return weapon;
-    }
+    @Override
+    public abstract void SpecialAbility(Entity entity);
+
+    @Override
+    public abstract String GetSpecialAbilityDescription(Entity entity);
+
+    @Override
+    public abstract String GetSpecialAbilityResultDescription(Entity entity);
 }
diff --git a/Java-Knight/src/main/java/org/project/entity/enemies/Goblin.java b/Java-Knight/src/main/java/org/project/entity/enemies/Goblin.java
new file mode 100644
index 0000000..05fba8b
--- /dev/null
+++ b/Java-Knight/src/main/java/org/project/entity/enemies/Goblin.java
@@ -0,0 +1,5 @@
+package org.project.entity.enemies;
+
+public class Goblin extends Enemy {
+
+}
diff --git a/Java-Knight/src/main/java/org/project/entity/enemies/Skeleton.java b/Java-Knight/src/main/java/org/project/entity/enemies/Skeleton.java
index 8a6a555..f370c2e 100644
--- a/Java-Knight/src/main/java/org/project/entity/enemies/Skeleton.java
+++ b/Java-Knight/src/main/java/org/project/entity/enemies/Skeleton.java
@@ -1,6 +1,5 @@
 package org.project.entity.enemies;
 
-// TODO: UPDATE IMPLEMENTATION
-public class Skeleton {
-    // TODO: DESIGN ENEMY AND IMPLEMENT THE CONSTRUCTOR
+public class Skeleton extends Enemy {
+
 }
diff --git a/Java-Knight/src/main/java/org/project/entity/enemies/Vampire.java b/Java-Knight/src/main/java/org/project/entity/enemies/Vampire.java
new file mode 100644
index 0000000..fa9a9e9
--- /dev/null
+++ b/Java-Knight/src/main/java/org/project/entity/enemies/Vampire.java
@@ -0,0 +1,45 @@
+package org.project.entity.enemies;
+
+import org.project.constants.gameConstant.AttackPowerUp;
+import org.project.constants.gameConstant.EntityState;
+import org.project.entity.Entity;
+import org.project.item.Accessory.Costume;
+import org.project.item.Accessory.Shield;
+import org.project.item.Accessory.Weapon;
+import org.project.item.Item;
+import org.project.item.KeyItem;
+
+import java.util.ArrayList;
+
+public class Vampire extends Enemy {
+    public Vampire (String name, int maxHealth, int health, long money, int baseDamage, EntityState state, Weapon weapon,
+                   Shield shield, Costume costume, ArrayList<Item> inventory, int defenseBonus, boolean isDefending,
+                   int healAmount, int stamina, int maxStamina) {
+
+        super(name, maxHealth, health, money, baseDamage, state, weapon, shield, costume, inventory, defenseBonus, isDefending, healAmount, stamina, maxStamina);
+
+        this.Key = new KeyItem("Vampire Key", this);
+    }
+
+    public Vampire() {
+        this("Vampire", 150, 150, 100, 20, EntityState.ALIVE, null, null, null, new ArrayList<>(), 8, false, 30, 100, 100);
+    }
+
+    @Override
+    public void SpecialAbility(Entity entity) {
+        int curHealth = entity.Health;
+        ModifyStamina(SpecialAbilityStamina, false);
+        Damage(entity, GetDamage(), new AttackPowerUp[]{AttackPowerUp.INEVITABLE});
+        Heal(curHealth - entity.Health);
+    }
+
+    @Override
+    public String GetSpecialAbilityDescription(Entity entity) {
+        return "Vampire will suck the blood out of " + entity.Name + " and heal themselves while hurting the enemy";
+    }
+
+    @Override
+    public String GetSpecialAbilityResultDescription(Entity entity) {
+        return "Vampire attacked " + entity.Name + " and sucked his blood out of his veins. He seems more powerful";
+    }
+}