Sledgehammer (film)

Sledgehammer is a 1983 horror film written and directed by David A. Prior.

Ten years later, seven friends acquire the house to party in, and travel to it in a van, which they leave with a mechanic. When night falls, Chuck convinces the others to participate in sance to try and summon the spirits of the couple that died in the house, so they can learn who killed them. The sance is just a means for Chuck and Joey to prank their friends, but it succeeds in bringing forth the ghost of the missing boy, which appears as a towering man in a smiling translucent mask. The spirit hides Joeys body after stabbing him in the neck, and the next day it attacks Jimmy and Carol while they are having sex, bludgeoning the former with a sledgehammer, and snapping the latters neck.Discovering the fates of their friends, the remaining four teenagers decide to hold up in the house until morning, at which point they will try to reach the nearest town. When the others fall asleep, John grabs a knife and goes off in search of the killer, and finds the boys skull in a closet, a newspaper mentioning his disappearance, and Carol and Jimmys bodies seated at a table, near Satanic imagery painted with blood. John is confronted by the ghost, and tries to fight it off, but is stabbed in the back. The phantom then captures Mary, and is found as the boy stabbing her to death by Chuck and Joni. The spirit assumes its adult form, wounds Chuck, and goes after Joni. ........

Source: Wikipedia