I couldnt find anything about this, didnt put that much time into searching, but still.
The quest The Ashtongue Corruptors: http://www.thottbot.com/?qu=10685
involes killing some guys that are invurnuble at first but you kill them by destroying the totems.
No you dont need the quest, just so you know which mobs im talking about.
So simply avoid touching the totems and you can hit these guys for aslong as you want for weaponskill. I found the Corruptor of Air(57,74) to be best cause there are no mobs around. So you can just leave your character there autohitting while watching a movie or something.
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