The contents of The Book of Eibon are primarily the work of Clark Ashton Smith, one of the most famous authors of Weird Tales and the inventor of the Book of Eibon, as well as Lin Carter, esteemed fantasy and horror editor. Robert Price, Richard Tierney, Joseph Pulver, and a number of other authors have helped complete the text, resulting in a tome that reveals all the secrets of the Cthulhu Mythos, from the history of the first alien races to come to Earth, to the histories of the Elder Magi of Hyperborea, and the and the story of Eibon's life and death.