Not just.. tentacles and darkness. Perpetually changing, not cemented in form, with an otherworldly feel to it. Completely unrecognizable by most human descriptions, and only able to be viable perceived by those fine enough to be an adept wordsmith.
Madness string 84048
Those are just words. Before the word came into existence people still believed in a god or gods. You do not need polytheism or anything else to believe in a god or gods other than that belief.