Xiraxis is a miniboss who is a monster with 218 health, and full Slime Armor. He incorporates elements from the Slime Boss---He summons minislimes to hop back into himself to restore health. He wields 2 Diamond Swords, and hits quite hard. He seems to be found in Nea Ekklesia.
Xiraxis is a replacement for the boss in Nea Ekkleasia to honor the creator of the original buiding.
Xiraxis' monster type changes based on how far from spawn the building is. At spawn, he's a skeleton. a Million blocks from spawn, he's a Minotaur, with all sorts of other things between.