Quachil Uttaus, the Treader of Dust, is Great Old One in H.P. Lovecraft's Cthulhu Mythos. "He" was a creation of Clark Ashton Smith, first referenced in The Treader of Dust. Apparently, "he" reduces all living tissue that "he" comes in contact with to dust, therefore similar to another Smith-related character, Ubbo-Sathla. Quachil Uttaus is generally associated with death, time and decay. "It was a figure no larger than a young child, but sere and shriveled as some millennial mummy. Its hairless head, its unfeatured face, borne on a neck of skeleton thinness, were lined with a thousand reticulated wrinkles. The body was like that of some monstrous, withered abortion that had never drawn breath. The pipy arms, ending in bony claws, were outthrust as if ankylosed in a posture of an eternal dreadful groping." -Clark Ashton Smith, "Treader of the Dust"