|Description||Cunning and Ruthless|
|Functions||Founder of The Vesper Interrogation Society|
Agent Castellan is the founder of The Vesper Interrogation Society. He is the second-most gifted agent in the German Empire. He is a member of the Vesper Hall of Fame. He used to work under Johann Schmidt, but resigned his post to create The Vesper Interrogation Society. He worked as an assistant to Damien Vesper II back in 1998. He is a Trainer at Junge Deutsche Ausbildung.