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In page Cthulhu Mythos:

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Impressed by the glossary, Derleth asked Laney to rewrite it for publication in the Arkham House collection Beyond the Wall of Sleep (1943).[6] Laney's essay ("The Cthulhu Mythos") was later republished in Crypt of Cthulhu #32 (1985). In applying the elemental theory to beings that function on a cosmic scale (e.g., Yog-Sothoth) some authors created a fifth element that they termed aethyr.[citation needed]