Notch Boss Battle (Almost impossible to kill ALMOST)
Note: Minify the command to avoid issues :)
Player Heads minecraft redstone
Herobrine in one command ! (Don't spawn him!)
Skeleton Mob (1.9.1)
Johnny the defender (1.8)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)