Klavikus was a powerful and ambitious demon at the court of the demon lord Orcus. Sensing him a threat, Orcus ordered Klavikus to take custody of Castle Perilous for 500 years. Klavikus used all his centuries of servitude to Zhengyi to read all the books in the lich's library. He started to send some of the tomes to his original house in the Abyss.
Klavikus wanted to rule the Abyss but Orcus tricked him into servitude. He loved reading and could be bribed with a good book.