When a person dies in a haunted place, he or she can be resurrected by the spirits inhabiting that physical space and become a paranormal entity with bizarre, lethal superhuman abilities based on the nature of their death. Because of these terrifying powers a Revenant gains upon resurrection, humans struggle to keep them contained in the Mausoleum, a prison designed to contain them and create revenue for scientific research by forcing Revenants to participate in brutal death matches.