Michigan Soul Eater

This unnamed Soul Eater was an ancient spiritual entity that lived in another dimension and fed on human souls.

History
Years ago, a hunter named Harvey called upon Bobby Singer for help with a house with apparently multiple poltergeists, not knowing it was actually a Soul Eater. When Bobby arrived, he found Harvey in a coma on the floor, having apparently been that way for days. Under attack by the Soul Eater in the house and desperate, Bobby tried a Celtic sigil for trapping monsters on the being. To Bobby's surprise, the sigil worked and the Soul Eater was trapped and its nest sealed. Bobby remained unaware of what it was he had faced for years however.