The character named Luchoboi has developed an invulnerability hack in arena somehow, he stood there and just let me pound on him just to show me he wasn't able to be assaulted, interestingly he made it seem like he was able to be hit for a while. So it's obviously something he had developed to be turned on and off.
I love this idea, but if they won't do that, why not just hold the camera to the last area you went to in the map. Moving it thousands of times to get to the same level is insanely time consuming, when you've already got to kill something 3,000 times to get a drop.