Book excerpt: Thirteen points of entry. Locked gateways to magical realms of immense power—and danger, for the uninitiated. Within these pages are thirteen keys. Enter the Necronomicon and be forever changed. In this authentic sourcebook for magicians, occult scholar Donald Tyson uses H.P. 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 based on the thirteen true zodical constellations. This authoritative guide presents the essential elements of the Necronomicon mythos for use in esoteric practices such as dream scrying, astral projection, magical rites, and invocations.