Cthulhu Ring

Cthulhu is a cosmic entity created by writer H. P. Lovecraft and first introduced in the short story "The Call of Cthulhu", published in the pulp magazine Weird Tales in 1928. Considered a Great Old One within the pantheon of Lovecraftian cosmic entities, the creature has since been featured in numerous popular culture references. Lovecraft depicts Cthulhu as a gigantic entity worshiped by cultists. Cthulhu's anatomy is described as part octopus, part man, and part dragon. Its name was given to the Lovecraft-created universe where it and its fellow entities existed, the Cthulhu Mythos.
Cthulhu's head is depicted as similar to the entirety of a gigantic octopus, with an unknown number of tentacles surrounding its supposed mouth.

Simply looking upon the creature drives the viewer insane, a trait shared by many of the Great Old Ones and Outer Gods.