A deceased prisoner and powerful psychic who suffered brutal torture at the facility. His vengeful spirit harasses the crew, kills David and Yuri, and possesses Ruth in the climax. His unresolved trauma and hostility drive the horror elements and dictate the survivors' tragic fate.
Yuri's obsession with his past leads to his direct confrontation and death by the entity.
Protagonist serves as a spiritual bridge to resolve the trapped entity's torment.
The entity ultimately claims Kate as its final victim through possession.
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