Get a Giant Slime in Minecraft.
Note: Minify the command to avoid issues :)
Fried Arm
Fireball Nuke
Get Giant Slimes
Agatha the friendly Creeper from Stampylongnose
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)