Nourish boosts all energy [Regen] AND applies Viral damage buff + Retaliation effect to Accused targets. If you Accuse enemies first then cast Nourish, it will apply the Nourish buff to them, giving approximately +160% viral dmg (or 2.6x final dmg). Furthermore, when you shoot one enemy they will all simultaneously trigger the AOE effect (approx 500 viral damage, brief stun, forced viral proc).

PLAYSTYLE

1. Keep Nourish, [Xata]'s Whisper and Vast Untime active as needed. [Xata]'s whisper duration will be frozen by Vast Untime so you really only need to juggle Nourish and Vast Untime uptime.
2. Cast Accuse on groups of enemies whenever needed to convert them into allies, and recast nourish near them to grant them the buff.
3. Cast Gaze on up to two enemies as needed for full armor strip. You can also cast Gaze to de-activate Acolytes, then shoot them to build up damage, and recast [Gaze] to deal all built up damage in one instance.
4. Kill enemies with your guns which are buffed by [Xata]'s Whisper and Nourish.

SURVIVABILITY

Shield gate by tapping 4 as needed, although you should be getting shot very little if you accuse all enemies and continuously kill things.
[Brief Respite] with two augur mods at 45 efficiency makes 4 generate 356 shield, which fully resets shield gate to about 1.3s.

ARSENAL

Pretty much any gun will become viable through the combination of full armor strip, [Xata]'s whisper and Nourish buff but Felarx, Phenmor and Laetum are even stronger because Xata's whisper double dips the 21x multiplier of Devouring Attrition/Devastating Attrition.

Build all your guns for Viral +/- Heat since full stripped enemies are usually weak to viral and heat.

PHENMOR Raw Elemental Devouring Attrition: https://overframe.gg/build/314745/phenmor/the-devouring-void-raw-viral-heat-phenmor/
LAETUM Non-crit Devouring Attrition (higher average DPS when spamming bodyshots): https://overframe.gg/build/315005/
FELARX Raw Elemental Devastating Attrition: https://overframe.gg/build/328134/felarx/the-devastating-void-extreme-raw-damage-cold-corrosive-one-shot/