Chthonian

Chthonians are described in the Cthulhu Mythos tales as immense earth-bound squids, with elongated worm-like bodies coated with slime. Chthonians are powerful burrowers, live for more than a thousand years, and are protective of their young. It is said that a chanting sound accompanies every chthonian, and that by such they can be detected while underground and unseen.

"Flowing tentacles and pulpy gray-black, elongated sack of a body... no distinguishing features at all other than the reaching, groping tentacles. Or was there – yes – a lump in the upper body of the thing... a container of sorts for the brain, granglia, or whichever diseased organ governed this horror's loathsome life!" – Brian Lumley, "The Burrowers Beneath."

The most important individual chthonian is the gigantic Shudde M'ell, which is worshipped by the rest.