diff --git a/src/de/miaurizius/jgame2d/entity/Entity.java b/src/de/miaurizius/jgame2d/entity/Entity.java
index fd15315..b935468 100644
--- a/src/de/miaurizius/jgame2d/entity/Entity.java
+++ b/src/de/miaurizius/jgame2d/entity/Entity.java
@@ -87,15 +87,7 @@ public class Entity {
         panel.collisionH.checkEntity(this, panel.monster);
         boolean contactPlayer = panel.collisionH.checkPlayer(this);
 
-        if(this.type == EntityType.MONSTER && contactPlayer) {
-            if(panel.player.invincible) return;
-            panel.playSE(6);
-
-            int damage = attack - panel.player.defense;
-            panel.player.life -= Math.max(damage, 0);
-
-            panel.player.invincible = true;
-        }
+        if(this.type == EntityType.MONSTER && contactPlayer) damagePlayer(attack);
 
         if(!collisionOn) {
             switch (direction) {
@@ -168,6 +160,15 @@ public class Entity {
     // INTERACTION
     public void setAction() {}
     public void damageReaction() {}
+    public void damagePlayer(int attack) {
+        if(panel.player.invincible) return;
+        panel.playSE(6);
+
+        int damage = attack - panel.player.defense;
+        panel.player.life -= Math.max(damage, 0);
+
+        panel.player.invincible = true;
+    }
     public void speak() {
         if(dialogue[dialogueIndex] == null) dialogueIndex = 0;
         panel.ui.currentDialogue = dialogue[dialogueIndex];
diff --git a/src/de/miaurizius/jgame2d/entity/monster/GreenSlimeMON.java b/src/de/miaurizius/jgame2d/entity/monster/GreenSlimeMON.java
index bf29f5f..9afcdda 100644
--- a/src/de/miaurizius/jgame2d/entity/monster/GreenSlimeMON.java
+++ b/src/de/miaurizius/jgame2d/entity/monster/GreenSlimeMON.java
@@ -4,6 +4,7 @@ import de.miaurizius.jgame2d.core.GamePanel;
 import de.miaurizius.jgame2d.core.enums.Direction;
 import de.miaurizius.jgame2d.core.enums.EntityType;
 import de.miaurizius.jgame2d.entity.Entity;
+import de.miaurizius.jgame2d.entity.projectile.RockObj;
 
 import java.util.Random;
 
@@ -19,6 +20,7 @@ public class GreenSlimeMON extends Entity {
         attack = 5;
         defense = 0;
         exp = 2;
+        projectile = new RockObj(panel);
 
         solidArea.x = 3;
         solidArea.y = 18;
@@ -33,14 +35,22 @@ public class GreenSlimeMON extends Entity {
     // INTERACTION
     public void setAction() {
         actionLock++;
-        if(actionLock != 120) return; //lock action for x frames
-        Random rand = new Random();
-        int i = rand.nextInt(100)+1; //Generate number between 1 and 100
-        if(i <= 25) direction = Direction.UP;
-        if(i > 25 && i <= 50) direction = Direction.DOWN;
-        if(i > 50 && i <= 75) direction = Direction.LEFT;
-        if(i > 75) direction = Direction.RIGHT;
-        actionLock = 0;
+
+        if(actionLock == 120) { //lock action for x frames
+            Random rand = new Random();
+            int i = rand.nextInt(100)+1; //Generate number between 1 and 100
+            if(i <= 25) direction = Direction.UP;
+            if(i > 25 && i <= 50) direction = Direction.DOWN;
+            if(i > 50 && i <= 75) direction = Direction.LEFT;
+            if(i > 75) direction = Direction.RIGHT;
+            actionLock = 0;
+        }
+
+//        int i = new Random().nextInt(100)+1;
+//        if(i > 99 && !projectile.alive) {
+//            projectile.set(worldX, worldY, direction, true, this);
+//            panel.projectileList.add(projectile);
+//        }
     }
     public void damageReaction() {
         actionLock = 0;
diff --git a/src/de/miaurizius/jgame2d/entity/projectile/Projectile.java b/src/de/miaurizius/jgame2d/entity/projectile/Projectile.java
index 03ea489..948e007 100644
--- a/src/de/miaurizius/jgame2d/entity/projectile/Projectile.java
+++ b/src/de/miaurizius/jgame2d/entity/projectile/Projectile.java
@@ -33,7 +33,10 @@ public class Projectile extends Entity {
         }
 
         if(user.type == EntityType.MONSTER) {
-
+            if(!panel.player.invincible && panel.collisionH.checkPlayer(this)) {
+                damagePlayer(attack);
+                alive = false;
+            }
         }
 
         switch(direction) {
diff --git a/src/de/miaurizius/jgame2d/entity/projectile/RockObj.java b/src/de/miaurizius/jgame2d/entity/projectile/RockObj.java
new file mode 100644
index 0000000..d72129c
--- /dev/null
+++ b/src/de/miaurizius/jgame2d/entity/projectile/RockObj.java
@@ -0,0 +1,36 @@
+package de.miaurizius.jgame2d.entity.projectile;
+
+import de.miaurizius.jgame2d.core.GamePanel;
+import de.miaurizius.jgame2d.core.enums.EntityType;
+
+public class RockObj extends Projectile {
+
+    GamePanel panel;
+
+    public RockObj(GamePanel panel) {
+        super(panel);
+        this.panel = panel;
+
+        name  = "Rock";
+        type =  EntityType.PROJECTILE;
+
+        speed = 5;
+        maxLife = 80;
+        life = maxLife;
+        attack = 2;
+        useCost = 1;
+        alive = false;
+
+        // INITIALISATION OF IMAGES
+        String defaultSprite = "/projectile/rock_down_1";
+        up1 = initEntitySprites(defaultSprite);
+        up2 = initEntitySprites(defaultSprite);
+        down1 = initEntitySprites(defaultSprite);
+        down2 = initEntitySprites(defaultSprite);
+        left1 = initEntitySprites(defaultSprite);
+        left2 = initEntitySprites(defaultSprite);
+        right1 = initEntitySprites(defaultSprite);
+        right2 = initEntitySprites(defaultSprite);
+    }
+
+}