This tiny mod is designed to prevent the wither from spawning anywhere other than in the nether. I created it because I felt that having the wither be the boss of the nether made sense. Attempting to summon the wither in any dimension other than the nether will do nothing.
Additionally, dispensers can no longer be used to place skulls, meaning the wither can't be spawned using redstone.
Modpacks: Unless I say otherwise, go ahead, sure, why not?