So according to a guide i've seen in yt, [Muzzle Flash] applies to self procs, rather than just assists'. Meaning it'll proc on your own kills and not just buffed allies'. That being said, increasing its range and duration is likely a win. (Credits to Kyaii)

This build dominates wide areas with Shooting Gallery and Collective Curse.

Strength starts off a bit underwhelming, but as you build up Molt Augmented, that's going to leave a mark.

Recompense heals and also grants overguard.

I'm still going to test if [Muzzle Flash] triggers Finisher Kill cues on enemies to trigger Arcane Ultimatum, if it doesn't then the way to go is Arcane [Guardian] or Arcane Reaper.

I would pretty much put about 5 TAUForged Amber Shards of energy on orb pickups in this to cover the energy hunger.

The amount of formas used for this is way too much, yeah. But as a melee main myself i'm willing to invest for it.

Since the Kullervo buff, might change to https://overframe.gg/build/498553/kullervo/

Resulting stats with conditionals on: (155, 100, 205, 202) with Molt Augmented on 250x.

Note: I did not build this yet, the stats bellow are speculation, for what i know of how the abilities scale

Wrathful Advance: Approximately 404% flat critical chance (404% + your weapon's critical chance)

Recompense: Likely healing 404 per dagger, 10 daggers total. That's 4040 health per cast. 5k+ if you cast it close range to a target. In the other hand, the self damage in case you miss might be about 76 per dagger.

Collective Curse: 100% (damage cap) channeled damage, BIG projectile

Shooting Gallery: 46.5 seconds duration, 50.5 damage bonus, 32.8 range
[Muzzle Flash]: 16.4 range, duration 10.85 seconds