Old screen shot. The shadow walk/dark aura/death nova bombers used to be able to do this much damage by using keybinds to click death nova huge numbers of times. Saw screens of one guy that managed to do 20k damage in a single second
The problem is, he doesnt hit back. Anyone could that, and probably still fail PvE with the same build. But then again, we have no idea what was used build/team wise, so I see these thread as pointless chest beating.