Yig is one of the Great Old Ones created by H.P. Lovecraft, and in many ways is the least Mythosian deity that Lovecraft ever created. See, Yig's big deal is that he is the Lord of Serpents. And that's basically it. He appears as either a giant snake, a giant snake with arms, or a giant serpentfolk. He is the patron god of the serpentfolk, and his concerns largely revolve around protecting and promoting the health of serpents all over the world. Don't mess with his snakes, and he'll generally leave you alone.