Twilit Grotto -- Esoteric Archives. Grimoires. Ancient Grimoires Grimoires are Ancient text manuscripts used in High Magick and the Black Arts to conjure Demonic, Celestial, Olympic and Angelic beings. They provide the Magician with the sigils or seals of each Diety and a description of how they will appear in form and what tasks they can do for your bidding. Some of these are purely systems of Magick. Some of these books can be easily found on Ebay or Amazon. But some are very hard to find and are not in print anymore. The Craft - Grimoire of Eclectic Magick. Miskatonic University Library - Grimoires. Stacy Whitman's Grimoire.