As a derivative film of the "Conjuring" series, some of the horror atmosphere is OK, and some scenes are really scary, but the storyline is a little empty, and the origin of the nun is explained in a few strokes. Contradictory places, for example, the gate of hell was cracked due to the war, allowing evil spirits to invade the monastery. Since the blood of Christ is hidden in the monastery, it will not be sealed. Why is the evil spirit now more powerful? Doppelganger? Or is being sealed a part of an evil spirit or another evil spirit? And the heroine bit the glass cross in the glass bottle underwater and contained the blood of Jesus? It feels a bit far-fetched. The most amazing thing about the whole film is the connection with the soul at the end of the film. Personally, I think this film should be richer in the plot, and the horror atmosphere may be more brilliant.
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