Necromancer Kelt'huzad:Kel'thuzad when he was still alive and not a lich.Blood Lord Kel'thuzad:Based off the Blood Lords from Wrath of the Lich King.Mephisto Kel'thuzad:Doesn't need to be exactly Mephisto, as he could be his own hero, but he could be some kind of floating demonic creature that summons demons.