Note: Minify the command to avoid issues :)
THE PURPLE BLOCK BOSS FIGHT (1.9)
Mo'zombies In OneCommand 1.8.6new zombies(Read the comments!)
Better EnderDragon (4 commands)
The helmet of MADNESS
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)