Ender Dragon

The Ender dragon is found when you enter a End Portal. The way to kill him is you have to first take out the healers on top of the obsidian towers. 1 to 2 of the towers have metal cages so what you have to do is go up there with blocks or Ender Pearl then with a pickaxe break the cage and the healer.                                                                                              

<-Healer for the Ender Dragon