Darkness has awakened

A girl is possessed by a dark and mysterious entity. She will fight with all the elements at her disposal to get rid of it. Neither her mother, nor traditional medicine, nor a supposed expert in exorcisms, will be able to make the demon disappear, until a nun gets involved in the case and sows a doubt more terrible than the possession itself.
In The Containment, consciousness is carried by the dead — a plane of “spiritual possession”. The story fights on E8/E9 of the E0–E14 reality ladder, compressing possession, faith, doubt, exorcism.
Films fighting at the same level of reality, about the same things.
Other films that move a human interior onto the same kind of thing.
The Possession (2012)consciousness in the dead · dybbuk box horror
Incarnate (2016)consciousness in the dead · possession dreamscape
The Medium (2021)consciousness in the dead · spirit‑possessed village
The Unholy (2021)consciousness in the dead · possessed-doll horror
The Others (2001)consciousness in the dead · haunted afterlife house
Insidious: Chapter 2 (2013)consciousness in the dead · the furtherThe same preoccupations carried by a different kind of thing — grief told through the dead, an animal, a machine.
The Conjuring: Last Rites (2025)consciousness in monsters · exorcism, faith
Prey for the Devil (2022)consciousness in monsters · exorcism, faith
Incantation (2022)consciousness carried elsewhere · faith, possession
Annabelle (2014)consciousness in objects · faith, possession
The Chronicles of Narnia: The Lion, the Witch and the Wardrobe (2005)consciousness in animals · faith
It's a Wonderful Life (1946)consciousness carried elsewhere · faith