Cthulu

Wikipedia -

The most detailed descriptions of Cthulhu in “The Call of Cthulhu” are based on statues of the creature. One, constructed by an artist after a series of baleful dreams, is said to have “yielded simultaneous pictures of an octopus, a dragon, and a human caricature…. A pulpy, tentacled head surmounted a grotesque and scaly body with rudimentary wings.” Another, recovered by police from a raid on a murderous cult, “represented a monster of vaguely anthropoid outline, but with an octopus-like head whose face was a mass of feelers, a scaly, rubbery-looking body, prodigious claws on hind and fore feet, and long, narrow wings behind.”

When the creature finally appears in the story, it’s said that the “Thing cannot be described”, but it is called “the green, sticky spawn of the stars”, with “flabby claws” and an “awful squid-head with writhing feelers”. The phrase “a mountain walked or stumbled” gives a sense of the creature’s scale.