Eli (2019)

Young Eli Miller has severe allergic reactions to the outdoors and is forced to live in protective gear. His parents, Rose and Paul, take him to Dr. Isabella Horn's secluded medical facility built in a renovated old house.

Eli is initially overjoyed to remove his "bubble suit" and enjoy comforts previously denied to him. However, he begins to experience supernatural phenomena in the house. He also begins his excruciatingly painful treatments. The specters repeatedly leave the message "lie", and Eli wonders if they refer to Horn's treatments.

Eli befriends Haley, the only person who believes the house is haunted. She tells him none of the other patients Horn treated left the facility. Eli discovers the word "LIE" is the inverted number 317, the passcode to Horn's office. In the office, Eli finds Horn's records of past patients, all of whom were killed by the third and final treatment.

Eli unsuccessfully tries to persuade his parents to get him out of the facility, but Paul sedates him. Hurt and confused, Eli barricades himself in Horn's office. He discovers and enters a hidden passageway to an underground chamber with religious paraphernalia. Horn locks Eli inside the chamber, causing Eli to pass out from the allergic reaction. When Eli awakes, he finds he can breathe fine, and he actually has no disease. Rose, feeling guilty for deceiving Eli, goes to him. When she opens the gate, Eli knocks her unconscious with a crucifix and flees but is recaptured by Horn and his father.

Rose regains consciousness and finds a dagger in the crucifix. She also discovers that the chamber contains the bodies of Horn's previous patients, bound and adorned with religious symbols. She forces her way into the treatment room but Paul restrains her. It is then revealed that Eli is a child of Satan himself, and his "allergic reactions" were him developing demonic abilities. Horn prepares to stab the restrained Eli with the ceremonial dagger, but Eli telekinetically stops the dagger and makes her stab herself. He then levitates the assistants in the air, spins them upside-down (resembling the Cross of St. Peter), then sets them on fire. Eli demands answers from Rose, who reveals she was desperate for a child, and when her prayers to God failed, she prayed to Satan instead, which led to Eli's birth. Paul tries to stab Eli, who telekinetically crushes his face.

Eli and his mother leave the burning house. Haley, who turns out to be another child of Satan, greets them, saying Eli is stronger than his paternal half-brothers and half-sisters. She offers to take Eli to his biological father. Rose drives the two children away from the burning facility.