A 1932 Plot construct of HP Lovecraft contemporary Clark Ashton Smith ''The Book of Eibon'' featured in many of Lovecraft's ''stories''. Said to be a type of Grimiore created by a Wizard named ''Eibon''. His Book contained a vast amount of ''Arcane Knowledge'' and Ancient Spells. The Narrative also gave instructions on ''how'' to invoke various ''Old Ones'' or Interdimensional Demon Gods. Part of The ''Eibon'' tales is that The Book was scattered, and many ''found'' are somewhat incomplete making such Rituals as ''Calling Forth'' the ''Black Gods'' impossible....that is until the missing pages are found!