NOTE: REQUIRES WALLJUMPING UNDER PRESSURE, ESPECIALLY IN HEROIC
In Slave Pens, there is a chest that's guarded by a pack of bogstrok things. There is a ledge right next to this pack with no path leading to it (you have to walljump a bit to get on it). I tried to pull them up it, maybe by some path I couldn't see, but they evaded. After a while, I thought "Hmmm, I wonder if I could get them to evade over HERE..."
First, walljump up to this ledge (you may want to CC the nearby Slavehandler):
http://i84.photobucket.com/albums/k2...ngexploit2.png
Then run across to where the chest is, but do not hop down:
http://i84.photobucket.com/albums/k2...ngexploit3.png
Attack them at range, then IMMEDIATELY run back to where you first hopped up, and JUMP DOWN:
http://i84.photobucket.com/albums/k2...ngexploit4.png
This is the hard part. As soon as you see the first Bogstrok coming around the corner, walljump back up, and again, IMMEDIATELY run back to the chest (jumping off, vanishing, and opening):
http://i84.photobucket.com/albums/k2...ngexploit5.png
Enjoy your lewtz.