'HRILIU: Symbolic Explorations of the Gnostic Mass' is an in-depth look at the central ritual of Ordo Templi Orientis (O.T.O.). The first half of the book gives a general overview of the Gnostic Mass from several different perspectives, including an examination of the basic symbols at work in the mass, the Officers, magical energy, and how Baphomet might play a major factor...

The second half of the book is a detailed analysis of the rubric of Liber XV: Ecclesiæ Gnosticæ Catholicæ Canon Missæ , the ritual text of the Gnostic Mass itself. IAO131 goes line by line through the text and goes into symbolic aspects of every part of the Gnostic Mass.

The book takes its title 'HRILIU' from the climax of this ritual, when the Priest and Priestess simultaneously utter this angelic word in rapturous communion. Overall, this tome comes in at almost 400 pages of symbolic and Qabalistic exploration of this beautiful and sacred Rite.