In the quest [Only registered and activated users can see links. ], you need to kill elite guys.
I found a bug using the pathfiniding.
Air Guys :
Earth Guys :
The red arrow is where the mob can walk to get on the wall.
The blue circles are the positions where you have to jump to.
The blue rectangle is where you have to jump between the blue circles.
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To be honest, this quest is very easily soloed by many classes. I soloed it on my lock as affliction (curse of exhaustion, dot and run) and on a shaman, earth bind, lightning bolt, frost shock, repeat. I am almost positive these mobs are able to be stunned and rooted in place as well.
EDIT: I was also able to fear the air elites on my warlock, which made it even easier =P