These Mysteries are a set of congregational rituals commemorating the attainments of Aleister Crowley, the Prophet of Thelema. Although originally developed for and with the cooperation of local O.T.O. groups, they are suitable for performance by any Thelemites. They can be conducted on the "unholy days" to reflect their historical inspiration, or in a day-long festival which arranges them into a single larger event. The five rituals in this book are among the latest and most advanced efforts I have made in the field of congregational ceremony. They aim to symbolically revisit key events in the life of the Prophet of Thelema, in order to energize and educate local communities of magicians. M. Dionysius Rogers is a serpent-fierce and dove-foolish scholar of religion, a Thelemic magician, and a performing liturgist. Since 2007, he has served as a bishop of the Gnostic Catholic Church, under the name T Polyphilus.