Atlach-Nacha
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Atlach-Nacha is one of the Great Old Ones of the Cthulhu Mythos, appearing as a gargantuan spider with a face that is just anthropomorphic enough to give it the ability to have recognizably human facial expressions. Created by Clark Ashton Smith, Atlach-Nacha resides in a great subterranean realm filled by a vast web that acts like a multi-pathed bridge. Originally, Atlach-Nacha's realm was said to lie under Mount Voormithadreth in Hyperborea, but more modern sources depict it as dwelling in the Dreamlands. Similarly to Yig and Tsathoggua, Atlach-Nacha is generally portrayed as one of the more chill Great Old Ones; so long as you don't try to screw with its web-weaving, it generally will leave you alone... a pity that it's said that Atlach-Nacha's web being completed will somehow bring about the end of the world.
Atlach-Nacha is one of the Great Old Ones/Outer Gods to get a fully-fledged deity writeup in Pathfinder 1e.