|“||The dark form ran toward him with incredible swiftness. When it came near he saw that there was a kind of face on the squat ebon body, low down amid the several-jointed legs. The face peered up with a weird expression of doubt and inquiry; and terror crawled through the veins of the bold huntsman as he met the small, crafty eyes that were circled about with hair||„|
|~ Clark Ashton Smith , The Seven Geases|
Atlach-Nacha resembles a giant spider with an anthropomorphic face capable of some human expression. It dwells in a cave system beneath Mount Voormithadreth, in the now extinct Arctic kingdom of Hyperborea. There, it spins a great web, bridging the many caverns of the underworld together. In its original appearance in the short story "The Seven Geases", Atlach-Nacha dwells between the lairs of Tsathoggua and the antehuman sorcerer Haon-Dor.
- In the Doom megawad Strange Aeons, the Spinner in Darkness is revealed to be the primary antagonist, tricking the player character into traveling across the Dreamlands to free it from its prison.
- Atlach-Nacha was created by Clark Ashton Smith; it has been mentioned or elaborated upon by August Derleth, Colin Wilson, Brian Lumley, Lin Carter, Laurence J. Cornford, James Ambuehl, and by some Chaosium products.
- Atlach-Nacha is referenced by name in the Thunder Lotus produced game "Sundered"; when the player corrupts an ability that allows them to run up walls they will then instead turn into a purple anthropomorphic spider and climb the walls instead. The corrupted ability is known as "Atlach-Nacha's Grip"
- Main article: Atlach-Nacha/Gallery