Twenty feet? Thirty? Forty? What's the range 'in the room'? Can anything block him? Do you mean literal darkness, like a shadow? [...None of this was anything out of the ordinary. None of it. When did his become his life? How many decades ago?]
Anything in any length of room. It doesn't matter. It's more difficult outside unless it's dark because there's interference from people, objects, the light... Things like that. But in any length of room, there's nothing to deter him. It's just you and him and that's it.
Fighting him. But there's no guarantee that you'll win or won't be possessed yourself. He likes hearts darkened by rage, anger, hate... He likes hearts without light.
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Does he have to touch them?
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If he does manage to possess someone, how do you free the victim?
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You don't. You won't be able to without them dying.
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Does he have an vulnerabilities? Numbers, types of attacks, so on?
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