Do You Worship Cthulhu?

From Board Game Geek:

A fun party game for a group of 5 to 30 people to play. The rules of the game can be learned in less than 3 minutes. One person acts as moderator, overseeing a village of people, one (or more) of which are secretly Cthulhu worshippers! The worshippers begin sacrificing the other villagers one by one.
Optional cards add additional roles such as Protector, Seer and Vigilante.
Box art, and all cards, feature original art (paintings) done just for this game by Ron Spencer.