the lich

The Lich is the main antagonist of Adventure Time. He is an ancient cosmic being who is the manifestation of the inevitable death of all things. His essence was deposited on Earth millions of years before the start of the show via a catalyst comet, but came into physical being near the end of the Mushroom War from a mutagenic bomb"after he possessed a person who had been submerged in mutagenic waste.His first appearance is in His Hero where the hero Billy casts him down. he wants to end all life