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"
QuachilUttaus is dubiously classified as a Great Old One and has the appearance of a squat, mummified corpse.
QuachilUttaus can reduce all living tissue that he comes into contact with to dust (and is therefore similar to another of Smith's characters, Ubbo-Sathla).
QuachilUttaus is usually associated with age, death, and decay.
Dreadful is the word that calleth him, though the word be unspoken save in thought: For QuachilUttaus is the ultimate corruption, and the instant of his coming is like the passage of many ages; and neither flesh nor stone may abide his treading, but all things crumble beneath it atom from atom.
For it may be that QuachilUttaus will come to him, bringing that doom which toucheth the body to eternal dust, and maketh the soul as a vapor for evermore dissolved.
And the advent of QuachilUttaus is foreknowable by certain tokens: for in the person of the evocator, and even perchance in those about him, will appear the signs of sudden age; and his house, and those belongings which he hath touched, will assume the marks of untimely decay and antiquity.