The Man Possessed By The Devil: The Nightmaretaker:

Arthur Kaine (a career-best performance by Lukas Schwarz) is a reclusive night watchman at the abandoned St. Agnes Sanatorium. Every night, he walks the same damp halls, checks the same locked doors, and ignores the scratching sounds from behind the walls. The twist? Arthur isn't guarding the building from intruders. He is guarding the world from himself. Possessed by a silent, ancient entity he calls "The Hollow," Arthur has struck a bargain: stay isolated, never sleep, and the demon won’t wear his face to hurt the living. When a young journalist (Mia Chen) hides inside the asylum to investigate disappearances, she breaks the ritual. The Hollow wakes up. And Arthur begins to enjoy it.

Schwarz’s performance is the anchor. He plays Arthur not as a snarling monster, but as a tired, weeping man holding a leash. When the possession takes over, his face doesn't contort into the usual black-eyed grimace. Instead, he goes still . He smiles. Slowly. And that quiet smile is more terrifying than any levitating head-spin. the nightmaretaker: the man possessed by the devil

Voss understands that true horror is texture. The film is shot in desaturated grays and deep, arterial reds. The sound design is remarkable—every creak, every distant child’s laugh, every wet crack of bone is amplified. The sanatorium becomes a character: peeling paint, religious murals with the eyes scratched out, and a basement filled with old therapy chairs that seem to breathe. Arthur Kaine (a career-best performance by Lukas Schwarz)