Yeah... casters can do it on elite. But I thought doing it on a pure rogue was pretty darn good.
Got killed when I farked up pulling a lever and had to release/reenter. Apart from that, didn't have to exit. Killed a few more monsters than I'd have liked (9), but will try to get that number down to 0. I believe with a little more patience it is doable with 0 kills and no exits.
Here's a screenie: