I do realise it's kind of a repost however I didn't want to bump the months old thread.
In 5.2 levitate was fixed and you couldn't use it any longer to make the fight easier. However since they raised arena floor in 5.3 it seems that levitate is working once again.
If you stand in the marked spot (in front of female orc on the box) you will not receive any damage throughout the entire encounter, neither from beams nor from turrets, making the fight one of the easiest.
Sadly it's only for ranged, maybe monk could be able to do it but not sure.
http://oi39.tinypic.com/mrr0ya.jpg