don't know the wither recipie? this will spawn it.
Note: Minify the command to avoid issues :)
LightningSnowballs Mod (Shorter command)
Rainbows, Rainbows,
normal witherboss
Generic villager
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)