So I beat him and got the Demon Mail. There's just one problem.
It says "Armor: Forged from Deadbear's Soul". Is there an even more secret boss we don't know about? I'm curious who this Deadbear is. Is it like Bone Dragon from Thousand Year Door, where it belonged to a different boss, but almost no one knew about it?
Huh... Now I want to see a Golden Sun Hack replacing Deadbeard with a pallete swap of the Mauler Line made to look like it's associated with Deadbeard, just for kicks.