With the introduction of [Internal Bleeding], a lot of weapons have gotten very interesting builds that increased their effectiveness like crazy.

We use Internal Bleeding to take advantage of a property of the Quellor's alt-fire: its guaranteed impact procs. Combining these guaranteed impact procs with [Internal Bleeding], we can get insane slash procs with the weapon. With this setup, you get 94.5k dmg slash procs on headshots with the Primed Bane mods. Without, you get 78.6k dmg slash procs on headshots.

Another thing that makes the Quellor's alt-fire really good is the fact that it has infinite punchthrough on enemies - that is to say, if there's no wall/obstruction between enemies, it will hit all of them with no drop-off in damage. This synergizes extremely well with [Mag]'s Magnetize ability, making it a solid choice to use with her kit if you don't like using the Secura Penta, etc.

Vigilante supplies is almost a must, as each shot from the alt fire consumes 50 ammo per alt-fire. Otherwise, run Carrier/[Carrier Prime] so you don't run out of ammo (or use.

The flex slot here is obviously the Primed Bane mods; you can go for [Vigilante Armaments], a Riven, etc., which would then probably change the amount of Formas needed for the build.