Recipe for a Satanic panic:
Take a medium-sized cult and their best demonic summoning. Mix with a dash of strange psychic powers. Generously add murderous reanimated corpses, inbred cannibal rednecks, sex-starved half-naked coeds, horny football players, and a surprise creature or two. Sprinkle in a fancy log cabin mansion, a labyrinthine set of tunnels, and a secret ritual chamber. Stir. Bake on high at 666 degrees.
You know it's gonna be one killer party...