diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
index 4158879..af1c02b 100644
--- a/.idea/jarRepositories.xml
+++ b/.idea/jarRepositories.xml
@@ -16,5 +16,10 @@
       <option name="name" value="JBoss Community repository" />
       <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://maven.myket.ir" />
+    </remote-repository>
   </component>
 </project>
\ No newline at end of file
diff --git a/Java-Knight/src/main/java/org/project/entity/Entity.java b/Java-Knight/src/main/java/org/project/entity/Entity.java
index 2a060f9..d0be577 100644
--- a/Java-Knight/src/main/java/org/project/entity/Entity.java
+++ b/Java-Knight/src/main/java/org/project/entity/Entity.java
@@ -1,6 +1,7 @@
 package org.project.entity;
 
 public interface Entity {
+
     void attack(Entity target);
 
     void defend();
diff --git a/Java-Knight/src/main/java/org/project/entity/players/Assassin.java b/Java-Knight/src/main/java/org/project/entity/players/Assassin.java
new file mode 100644
index 0000000..b786431
--- /dev/null
+++ b/Java-Knight/src/main/java/org/project/entity/players/Assassin.java
@@ -0,0 +1,13 @@
+package org.project.entity.players;
+
+import org.project.entity.Entity;
+import org.project.item.armors.Armor;
+import org.project.item.weapons.Weapon;
+
+public class Assassin extends Player implements Entity  {
+    public Assassin(String name, int hp, int mp, Weapon weapon, Armor armor) {
+        super(name, hp, mp, weapon, armor);
+        setMaxMP(60);
+        setMaxHP(45);
+    }
+}
diff --git a/Java-Knight/src/main/java/org/project/entity/players/Knight.java b/Java-Knight/src/main/java/org/project/entity/players/Knight.java
index 14d8fa2..8201821 100644
--- a/Java-Knight/src/main/java/org/project/entity/players/Knight.java
+++ b/Java-Knight/src/main/java/org/project/entity/players/Knight.java
@@ -1,6 +1,16 @@
 package org.project.entity.players;
 
-// TODO: UPDATE IMPLEMENTATION
-public class Knight {
+import org.project.entity.Entity;
+import org.project.item.armors.Armor;
+import org.project.item.weapons.Weapon;
+
+
+public class Knight extends Player implements Entity {
+    public Knight(String name, int hp, int mp, Weapon weapon, Armor armor) {
+        super(name, hp, mp, weapon, armor);
+        setMaxMP(45);
+        setMaxHP(45);
+    }
     // TODO: DESIGN KNIGHT'S WEAPON AND ARMOR AND IMPLEMENT THE CONSTRUCTOR
+
 }
diff --git a/Java-Knight/src/main/java/org/project/entity/players/Player.java b/Java-Knight/src/main/java/org/project/entity/players/Player.java
index ff5385c..9195271 100644
--- a/Java-Knight/src/main/java/org/project/entity/players/Player.java
+++ b/Java-Knight/src/main/java/org/project/entity/players/Player.java
@@ -4,8 +4,8 @@ import org.project.entity.Entity;
 import org.project.item.armors.Armor;
 import org.project.item.weapons.Weapon;
 
-// TODO: UPDATE IMPLEMENTATION
-public abstract class Player {
+
+public abstract class Player implements Entity {
     protected String name;
     Weapon weapon;
     Armor armor;
@@ -13,6 +13,9 @@ public abstract class Player {
     private int maxHP;
     private int mp;
     private int maxMP;
+    private final int defendCost = 6;
+    private boolean isDefending = false;
+    private final int healCost = 12;
 
     public Player(String name, int hp, int mp, Weapon weapon, Armor armor) {
         this.name = name;
@@ -30,17 +33,48 @@ public abstract class Player {
 
     @Override
     public void defend() {
-       // TODO
-    }
+        //checking mana
+        if (mp < defendCost) {
+            System.out.println("Not enough mana to defend!");
+            return;
+        }
 
+        //reducing mana
+        mp -= defendCost;
+
+        //activating defense mode
+        isDefending = true;
+
+        System.out.println("🛡️ " + name + " raises shield, preparing to block next attack!");
+    }
 
     @Override
     public void takeDamage(int damage) {
-        hp -= damage - armor.getDefense();
+        int actualDamage = damage;
+
+        //reducing damage if the player is in defend mode
+        if (isDefending) {
+            actualDamage = damage / 2;
+            System.out.println("🛡️ Defense reduced damage from " + damage + " to " + actualDamage);
+            isDefending = false;
+        }
+
+        hp -= actualDamage;
+        if (hp < 0) {hp = 0;}
     }
 
     @Override
     public void heal(int health) {
+        //checking mana
+        if (mp < healCost) {
+            System.out.println("Not enough mana to heal!");
+            return;
+        }
+
+        //reducing mana
+        mp -= healCost;
+
+        //increasing health
         hp += health;
         if (hp > maxHP) {
             hp = maxHP;
@@ -49,10 +83,19 @@ public abstract class Player {
 
     @Override
     public void fillMana(int mana) {
+        int oldMana = mp;
+        mp += mana;
+
         mp += mana;
         if (mp > maxMP) {
             mp = maxMP;
         }
+
+        if (mp == maxMP) {
+            System.out.println("Mana is now full! (" + mp + "/" + maxMP + ")");
+        } else {
+            System.out.println("Mana increased from " + oldMana + " to " + mp);
+        }
     }
 
 
@@ -86,4 +129,11 @@ public abstract class Player {
         return armor;
     }
 
+    public void setMaxMP(int amount) {
+        maxMP = amount;
+    }
+
+    public void setMaxHP(int amount) {
+        maxHP = amount;
+    }
 }
diff --git a/Java-Knight/src/main/java/org/project/entity/players/Wizard.java b/Java-Knight/src/main/java/org/project/entity/players/Wizard.java
new file mode 100644
index 0000000..ae37b40
--- /dev/null
+++ b/Java-Knight/src/main/java/org/project/entity/players/Wizard.java
@@ -0,0 +1,13 @@
+package org.project.entity.players;
+
+import org.project.entity.Entity;
+import org.project.item.armors.Armor;
+import org.project.item.weapons.Weapon;
+
+public class Wizard extends Player implements Entity  {
+    public Wizard (String name, int hp, int mp, Weapon weapon, Armor armor) {
+        super(name, hp, mp, weapon, armor);
+        setMaxMP(45);
+        setMaxHP(60);
+    }
+}