On the heels of his widely successful trilogy of works honoring H. P. Lovecraft, Donald Tyson now unveils a true grimoire of ritual magic inspired by the Cthulhu Mythos. The Grimoire of the Necronomicon is a practical system of ritual magic based on Lovecraft's mythology of the alien gods known as the Old Ones. Fans of Lovecraft now have the opportunity to reliably and safely get in touch with the Old Ones and draw upon their power for spiritual and material advancement. Tyson expands upon the Old Ones' mythology and reintroduces these "monsters" in a new, magical context—explaining their true purpose for our planet. As a disciple, you choose one of the seven lords as a spiritual mentor, who will guide you toward personal transformation. Grimoire of the Necronomicon features ritual forms and invocations for the daily and yearly rites of the Old Ones, individual rituals devoted to each of the seven major figures of the mythos, and most importantly, a grand ritual for personal attainment. The daily rituals provide an excellent system of esoteric training for individual practitioners. This grimoire also provides structure for an esoteric society—Order of the Old Ones—devoted to the group practice of this unique system of magic.