Vampirism

A book on vampirism is in the Schattenjäger library.

Background
There are many forms of vampirism. One is associated with a blood disorder and is not supernatural. Another, also non-supernatural, is based on a form of insanity. Of supernatural vampirism, there are also several varieties including Inherited, Communicative, and a vampirism used in black sorcery power-drawing rituals.