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First off this post is old, second there's still no confirmation on that whatsoever. I agree it's likely, but far from confirmed.
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I know it's old. I just searched rezyl and yours was pretty much it. I know it's not confirmed, but the new grimoire leads to it more than any other direction, especially since its one of the only grimoire that makes reference to xyor the unwed who basically acted as keeper of the thorn in it'd original bounty.