As well as box breathing, the catalyst increases reload speed for those times when you do miss, or when you are sure you hit a crit shot but the game says otherwise. Also dont forget the awesome ship Once you have run the mission a few times and have a solid strat down, it gets easier. (also the higher the catalyst completion, the more damage dealt in heroic for whisper) 2 weeks ago i usually had 2 mins left on the clock, last week around 5 mins left and this week about 7 or 8 mins left