Pyramidos traces the history and development of this fundamental magical ceremony from its earliest origins in the famed Golden Dawn Cipher Documents, through Crowley's first attempts to codify a system of magick in the Order of the Lamp of the Invisible Light to the final composition of the Pyramidos Ritual as the jewel in the crown of Crowley's own magical order. The Pyramidos Ceremony is included in its fully expanded form and the symbolism of the ritual is explained in detail. There is also a comprehensive examination of the Golden Dawn Neophyte Ceremony as well as several complete magick ceremonies that are discussed in the text. Pyramidos is a handbook for the performance of this central ceremony of modern Hermetic magick. It includes 15 illustrations and a complete bibliography of references.