Behold: The Prince of Darkness is a text discussing the religion of Setianism - based on the Ancient Egyptian God Set. Founded in 1975 after separating from the Church of Satan, Setianism has grown considerably in the past decades. Setianism is a part of the Western Left Hand Path, focusing on things such as self-deification, individuality, questioning of dogma and authority, and more. This text discusses the main beliefs of Setianism, compares Setianism to similar religions, looks at the history of Set, provides empirical evidence and logical arguments supporting Set, and looks at the role Set played in the Pyramid Texts.