Sethius was an ancient vampire who, according to Count Dracula, was around 3000 years old by the time of his death ("Hit Chicks"). According to legend he was one of the very first vampires. He was also the self-proclaimed Chosen One of vampire-kind. His plan was to turn every breather in the world into vampires and begin a vampire civil war, but the ancient vampires believed he was insane and imprisoned him in the Praedictum Impaver. The Praedictum Impaver eventually fell into Bertrand's hands. Bertrand believed that once opened, the book would reveal the destiny of the vampires.