Gol-Goroth, also known as the Forgotten Old One, and the God of the Black Stone. There is not much known about this being, but what is known is that he appears as a gigantic, black, toad-like creature with an impossibly malevolent glare, or a tentacled, scaled, bat-winged entity. And that in the past, youths  were sacrificed to Gol-goroth at the waxing and the waning, the rising and the setting of each moon.