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...