On the heels of his successful and critically acclaimed Necronomicon books, Donald Tyson now unveils an authentic sourcebook for magicians inspired by H.P. Lovecraft's Cthulhu mythos. Tyson uses Lovecraft's story elements and characters - alien races, ancient sorceries, the Dreamlands, deities, witches, and ghouls - as the foundation for a workable and coherent system of modern ritual magic. This authoritative guide, based on actual zodiacal constellations, presents essential elements of the Necronomicon mythos for use in esoteric practices such as dream scrying, astral projection, and spirit communication.