User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-29552261-20170510191451/@comment-27362456-20170511105553

Probably corruption from manipulating the gates for the majority of his life.

That or when he battled Karna Masta to seal him in Ishgria, along with the curse of summoning, Karna Masta maybe cursed Lucius so he had to remain in the Bariura crater. One of the side effects was Lucius becoming a giant purple parrot with and LED bulb for a face.