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Yep, read a bit of the novel, this thing wasn't a demon but a necromancer that had lived for centuries and joined hands with the demons, the reason it was working for them is because for it this plan was nothing else but a entertainig game.
It was fully exorcised, can't come back, the escape into this kid was its ace in the sleeve, and MC executing the other nobles with dark aura at the start of the story and its bodyguards in the recent ambush removed all the other spare bodies it had.