As for deathfield. I have a guildie that hits that with power stacked hazmat/WH gear on his sorc.
to do so he has to have 2400 DF base plus 200-300 to it to bypass dmg reduction of full wh target to crit finally 5k (with aprox 110% crit mult). ill not believe that assassin can do it. iam nearly max power, my DF is around 2k (but even so i quite reraly crit of 4k on recruite geared guys, since any class has passive dmg reduction at least a few percent against int dmg, i can stack more power to get 50 dmg more.. may be 70.. but not 400-500.. this is impossible.