From the introduction: Beyond the skein of the material, beyond the ken of mortal senses, are creatures powerful beyond imagining. Gods. Archfey. The living jungle of Kush and the dread titans of the Wastes. Powerful undead or the lingering will of a million wronged souls. Such entities can bestow power upon those foolish enough to seal a pact with them. This relationship is what distinguishes occultists from clergy, and this power has been the focus of occultism since time immemorial.