The Nun (2018), Part of The Conjuring universe, explores the origin of the demonic entity Valak. Set in 1952 Romania, the film follows Sister Irene, a young novitiate, and Father Burke, a priest with a dark past, as they are sent by the Vatican to investigate a nun's mysterious suicide at a remote abbey. They uncover a dark secret: the abbey is haunted by Valak, a powerful demon in the guise of a nun, unleashed after a rift to Hell was opened.
The duo battles sinister forces, unraveling the abbey’s tragic history while trying to seal the rift and stop Valak’s growing power. Combining eerie atmospheres, gothic visuals, and intense scares, The Nun ties into The Conjuring franchise by revealing Valak’s connection to the Warrens' later encounters, making it a chilling origin story.