Though it's a very well-made movie with strong characters and emotionally resonant situations, it can be very intense and frightening, especially considering that a 6-year-old boy is frequently in peril. There are nightmare sequences, knives, stabbing, and some blood and gore.
This movie explores the more disturbing and realistic side of the genre, I'd say it's more haunting than said movies for sure. It's psychological horror at its finest. It actually gets under your skin, and when a movie can do that, it has done its job.
In The Conjuring 2, Ed and Lorraine Warren encounter a demonic nun figure named Valak. At the end of the film, Lorraine learns the demon's name and manages to banish it to hell. while audiences may have thought the film would be the last they'd see of Valak, she returns in The Nun.
Vera Farmiga's real-life sister, Taissa Farmiga, also stars in The Conjuring prequel, The Nun, as Sister Irene, sparking speculation that the two characters are connected, whether they are the same person, sisters, or related in some way.