So you can kill majors with it and buff it by killing mobs, getting the master of reclusion buff and diminishing returns from hidden spigot (you don’t get endless heavy like whisper). Then you get the recluse buff to melt mobs and gain a high accuracy buff from the catalyst that remains for one shot which you’ll save for the boss damage phase — rinse repeat — plus your kinetic weapon (which I recommend be a special) and heavy ammo drops during the fight and you’ll be slaying.