"It was a terrible, indescribable thing vaster than any subway train—a shapeless congeries of protoplasmic bubbles, faintly self-luminous, and with myriads of temporary eyes forming and un-forming as pustules of greenish light all over the tunnel-filling front that bore down upon us, crushing the frantic penguins and slithering over the glistening floor that it and its kind had swept so evilly free of all litter."
The Shoggoth is the most hideous and horrid being that is not a god. Without form or order of any kind, the Shoggoth is a putrid mass of eyes and teeth, claws and talons extending and groping towards a victim at a terrifying pace.
The Shoggoth is known for many things, and very few who see it live to tell the tale, suggesting many of the "powers" of the Shoggoth are in fact, rumors created through bad translation and exaggeration.
The Shoggoth is apparently so terrifying, that even the Mad Arab Abdul Alhazred , the writer of the Dread Necronomicon, found the idea of their existence terrifying and without reason or logic. Shoggoths were created by Elder Things as a biological tool, making cities and doing labor for the Things. At one point, they had a rebellion and killed off most of the Elder Things, leaving the once great race to rot in their broken cities, while the Shoggoths stole their culture and made it their own. Now, Shoggoths have once more regressed into unintelligence.