maybe it's because u guys clearing too slow? do u guys have a good friend and r u missing any burst hour?

i believe if ur friends group is above 70/80 and right at burst hour.... it only takes like 2-5 minutes per fight...

i'm using dark element, just 1 full burst it will take off 50% of the hp(imagine a lv 90s using counter element) so if the next guy going to burst as well.... then that's it, next round thank you~