I actually thought about some other dark gods just now, and they would make Cthulu crap himself, as in "How the ???? am I being corrupted, I'm the mighty Cthulu-arrrrgh"
They were the big bad guys to the ancient Aztecs, Tamzumine, Demons of Twilight, Devourers, The Enemy..., not positive on the spelling, they're the reason the Aztechs feared the catholics, as their ancient symbol was the t, and from history the Aztechs did all their rituals and spiritual 'Games' to keep them at bay, but they were believed to return every 10,000 years... which would be... soon *Bogeyman jumps out*.
One friend of mine was Catholic until he researched and found out about them, and it decimated his faith