Desecration (1999)

"Desecration" is a psychological chiller about a beyond-the-grave relationship between a teenage boy and his long-dead mother. Bobby, a 16-year-old loner, has been emotionally damaged by his mother's early death and a repressive Catholic upbringing. The boy accidentally causes a nun's death, triggering a chain of supernatural events and violent mayhem that leads Bobby into Hell to confront his mother. Powerful childhood demons are exorcised and unleashed as the gates of Hell open in this gripping, hallucinatory film.