User blog comment:SilverHexxitFights/Which Bosses Need Hardmode Variants?/@comment-24223548-20131129192442

The Brain of Cthulhu needs an upgrade because its counterpart the eye of cthulhu has one. I don't think it should be 2 brains though, because that doesn't really make sense. It should be a mechanical brain that at first psybeams at you that last for a while like the rainbow gun's projectile. It should spawn a bunch of brain cells that follow you around and explode on contact that drop hearts. For its second stage, it should charge at you and start teleporting everywhere and shoot lasers at you. It should drop a new soul and maybe brain cells that go into new armor that lets you teleport.