Only 4 forma because you get a free one when you gild. Very similar to Dioxety's build, but with [Vigilante Armaments] instead of [Hunter Munitions]. I think that a 50% chance to do another damage tick is better than some slash damage on a crit personally.

Optional Changes (for less grinding):
If you aren't high enough rank with Solaris United you can use Bushrack as opposed to Splat, it's just a bit less crit chance.
Swapping out [Primed Cryo Rounds] with [Cryo Rounds] is fine, as long as you are ok with sacrificing a little bit of damage.
If you can't get Splat, don't bother with Pax Charge, it's rank 5 S.U 💀
(I'm doing all three of these because im broke lmao)

If you can think of a way to improve this, I'd be happy to hear it :)

Link to Dioxety's build: https://overframe.gg/build/107268/vermisplicer/vermisplicer-primary-great-critviral-beam-video/