There is a lot going on in the movie, people being dragged on the floor by the ghost, frequent jumpscares even when you least expect it, and in the last 30m of the film there is a bunch of jumpscares and all of them is unpredictable.
Korena Bell's character (The Unholy) can be very unsettling for some people.
Celeste Cid's character (Del Celestial) is seen running in a dark room, and all we can see is her, it then starts to get red then we see her being dragged to a place like hell by Korena Bell's character (The Unholy).