o my GOD!
Note: Minify the command to avoid issues :)
RIDE THE ENDER DRAGON !!!!!!!!!!
Mobs with special abilites! only ONE command! 1.8.7 (Read The comments! )
FRIENDLY MACHINE
Fish Warrior Mini boss battle (1.8,1.9)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)