"The Necromancer"

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Originally Posted by Zigûr

I noticed this once myself. As Inzil has said it does seem to explain Barrow-wights and so on, doesn't it?

Yeah sure and also I think the werewolves, that are associated with Sauron too. A werewolf was, it seems, essentially a wolf inhabited by an evil spirit, like Carcharoth (but less formidable). It was likely werewolves that attached the fellowship near the Misty Mountains.