The simply named Yig is one of the many deities from H.P Lovecraft's Cthulhu Mythos. Being one of the Great Old Ones, Yig first appears in The Curse of Yig, acting as a god who sends his minions/children out to punish all who has murdered a snake in the past by either killing them or turning into a snake-like creature such as himself. Though Yig is easy to anger, the Father of Serpents is also easy to please.
The male god appears as a humanoid with serpent-like features, going up with his alternate name. While having a pair of bat wings gouged out of his back, the deity is also imagined as a hydra or simply an oversized, anthropomorphic snake.