Eryn was born to a demon mother and human father, who went missing after a attack on their village by a gang of Piglins. Eryn later befriended a young Tommy, the two becoming childhood friends. Eryn attempted to help Tommy by building a shrine to Dream (not understanding Tommy's relationship with Dream) and became involved in the Egg conflict, where he lost his first cannon life. Eryn is a violent and chaotic individual. He has threatened to kill people and their pets. He is bisexual.