Took me 8 hours to make, have fun...
Note: Minify the command to avoid issues :)
Grim the Golem pet
Cooler Zombie
Charged Creeper EGG
Zombie Apaclipse
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)