We used the most optimized way that includes skips for every part except of the "ghost defend" part and were lucky to have the pillars spawned, used 2 whole reserves of power ammo, 4 novas and 2 celestial nighthawks on the boss with lvl 305 while having the time cap. And STILL only had 41 sec left after we killed the boss. I really think that this is way too much asked.