Did you mean read or feed? In the book Storm Thief, there are Revenants. I think they get their energy from the souls of the humans they possess.
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you will have to read it to find out what a revenant is but one of the revenants, Derek Vincent, and Caspian fight as Derek is trying to hurt abbey and then Caspian is lying on the floor and we don't find out what happens to him.....
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It would be any high level revenants. Located in the wild
Read from the paper