04-04-2017, 01:30 PM
This reminds me of Cold Hands in ASoIaF, if I remember correctly, he was a member of the Night's Watch but since he became CH he's unable to cross the wall, just like the wights, white walkers and Night's King. The magic that changed them also prevents them from entering the kingdoms south of the wall, as long as the magic of the wall holds, they can't cross. So Zerstörer could still be a Grimm that went rogue/was corrupted by magic or something else. I don't think the staff belongs to him at all, he's just been wielding it or at least trying to but someone got a hold of the staff and broke it into a hundred pieces so he couldn't get it.