The H.P. Lovecraft Wiki

This subject contains information from the "Lovecraft Circle" Myth Cycles, and while guided by HPL are not based on his work alone. This subject contains information from the Derleth Cthulhu Mythos, and not based on H.P. Lovecraft's works directly. This subject contains information from the Expanded Cthulhu Mythos, and not based on H.P. Lovecraft's works directly. Grimoires are books of great importance or power and are the source of much of the forbidden knowledge that illuminates the darkest recesses of the world. These books contain forbidden knowledge and discoveries about the Great Old Ones or of many occult topics. Often times these discoveries of forbidden truths end up driving the reader insane or leading to their ruin in one way or another.

List of Known Grimoires

Lovecraft's Work

Lovecraft Circle

Expanded Mythos


  • Ars Magna et Ultima
  • Atlantis and the Lost Lemuria
  • Black Rites
  • Book of Dzyan
  • Commentaries on Witchcraft
  • Confessions of Monk Clithanus
  • Cthulhu in the Necronomicon
  • The Daemonolorum
  • Ghorl Nigral (Lovecraft at Last)
  • Investigations into the Myth-Patterns of Latter-Day Primitives, with Especial Reference to the "R'yleh Text"
  • Magnum Immonandum
  • De Masticatione Mortuorum in Tumulis
  • Parchments of Pnom
  • The Prehistoric Pacific in the Light of the "Ponape Scripture"
  • Rituals of Yhe
  • Seven Cryptical Books of Hsan
  • Sussex Manuscript (see Necronomicon/Variants)
  • Thaumaturgical Prodigies in the New-England Canaan
  • Yuggia Chants


The trend of using fictional texts containing eldritch knowledge was begun by H. P. Lovecraft before the creation of the Cthulhu Mythos. He also encouraged his friends and acquaintances (Clark Ashton Smith, Robert E. Howard and others) to utilize his grimoires in their stories and to invent their own. The appearance of references to these forbidden books in the works of many authors has sometimes led to more credulous or poorly educated readers believing they might be real.