Yog-Sothoth was an eldritch horror who existed in some universes.
In the 925th Universe, a young Marietta Over-There was tricked by Nyarlathotep into performing a ritual which she was told would rouse Yog-Sothoth from his eternal slumber and, as a result, destroy the world. However, the ritual did no such thing, and indeed, as Marietta would later realise, it was Azathoth whose awakening was supposed to end the world, not Yog-Sothoth's, in the first place. (PROSE: A Very Jenny Over-There Christmas)
In Universe, Yog-Sothoth was awake and seemingly benevolent, and an Outer God like Nyarlathotep, with the two being at odds. This Yog-Sothoth appeared as a telepathic being made of infinite crystal spheres and tentacles. He displayed the ability to block Jenny Over-There's powers if he desired. (PROSE: Who Laws the Lawyers?)
External links