He is a Plague Doctor who was banished to a another dimension because he was a mortal who discovered immortality. He is extremely inteligent being having over 700 years. It not exist disease that he can't cure, no byology that he don't know. HE is a cold, gentle, smart and kinda powerfull being. he can create any type of chemical weapon or even disease. He can't die of age or disease. He has a regenaration so strong that he can regenerate from any organ