Laser Beams!
Achtung: Minifiziere den Command um Probleme zu vermeiden :)
Player Heads minecraft redstone
Lightning Launcher
FRIENDLY MACHINE
More mobs:Nature skeletons 1.8.7 (Read the comments!)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)