The Nightmaretaker: The Man Possessed By The Devil Guide [patched]

He tried to tell the vicar. Father Emmett listened with an indulgent smile until a bruise shaped like a palm appeared on Halloway's forearm overnight. The vicar's smile faded. They prayed. The bruise spread like a small night, mapping tendons and bone with an ink that didn't wash off. The prayers worked—only to make the voice more precise.

A management system where certain actions increase the devil's control. If the gauge maxes out, the player may lose control entirely, leading to "bad endings." the nightmaretaker: the man possessed by the devil guide

As she touched the stone, she felt a surge of power course through her veins. She saw the world through Elijah's eyes, and she knew that she had the power to set him free. With a cry of triumph, she shattered the stone, releasing Elijah from his pact with the devil's guide. He tried to tell the vicar

He started keeping lists—ink-smudged, careful lists of requirements, times, oddities. He pinned them to the shed wall with nails shaped like question marks. He kept a ledger of names the dead whispered: debtors, lovers, secret saints. He carved a single, iron rule into the inside of the shed door: Remember to sleep. Sleep is a door; do not stand in it. He read it at night and pinched his skin until the ache chased the edges of the dream away. They prayed

However, the demon did not simply "wear" Vane. According to the lore, Xaphan was fascinated by the human mind's ability to generate terror. Instead of destroying Vane’s consciousness, the demon fused with it, creating a hybrid entity. Vane is aware he is possessed, but he is powerless to stop the demon from using his physical form to "walk" through the dreams of the living.

If this is for a sandbox game: