Originally Posted by
Cats_say_moo
A arena just for a wither, Doesnt seem that reasonable.
Probly withers wont be added for a while concidering would you really like to see Beacons everywhere in the world, on plots, In the wild, Better to keep it the way it is to buy it from the shop and keep it more of a overall goal in the server. (My opinion)
If it was in the end there is nothing from it spawn camping you, Also i dont think it would be possible for a mob to be spawnable in the end but not in the normal world.