The "Demons of Tiamat" is a work of Nightside Thelema, Satanism, and the Left Hand Path
It builds on the work of Kenneth Grant in the Typhonian Thelemic tradition, as well as concepts contained in the Temple of Set, and Apocalyptic imagery. Mixing ritual with theory, it provides a means for accessing Nightside energies directly and work with them, as well as historical essays about the god forms described.
Included are essays about the origin of the Nightside in Thelemic thought, Sethian Gnosticism, Theistic Satanism, the Egyptian god Set, Horus, how Chaos Magick can approach the Golden Dawn system, and the Qabalah in general. Also touches on the work of Michael Bertiaux.