This category contains all related material from the "Cthulhu Mythos", a shared universe incorporating the stories of H. P. Lovecraft, as well as numerous other authors, including contemporary collaborators (such as Clark Ashton Smith, Frank Belknap Long and Robert Bloch), successors (such as August Derleth, Ramsey Campbell and Stephen King), and even authors that came before and whose creations were incorporated by Lovecraft in his own lore (such as Robert W. Chambers and by extension Ambrose Bierce).

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