Nourish giving viral AND boosting the energy restored from Entropy effect? Check (sadly it doesn't also multiply the max energy, but that would be even more wild, wouldn't it?)

Arcane Avenger giving an extra 45% crit chance, combined with [Point Strike] and crit chance on a riven to total 100%+ for guaranteed tier 1 crits for Hunter Munitions? Check

This is a HUGELY underrated primary... it will buff just about any projectiles (except glaives and glaive-like) that pass through fully stacked orbs; on frames like Titania and Yareli -- where your primary rarely matters, because you are using exalted(s) / a secondary / etc. most of the time -- this has HUGE utility, especially when combined with the Entropy buff

EVERY STAT ON THAT RIVEN MATTERS... ideally you will want all four, but if it HAS to be only three: +Multishot, +Critical Chance, -Projectile Speed... in terms of values, multishot at the bare minimum NEEDS to be at or over 100% (after disposition applies) due to how the orb stacking mechanic works; the riven slotted here shows an example of "worst" rolls on the crit stats, which are still good because it's like having another of [Point Strike] and [Vital Sense]... meanwhile the projectile speed curse is actually beneficial because:

1. The orbs will bounce off of objects and enemies no matter what, even with punch-through (thus we don't apply any); lower projectile speed will reduce not only the chances of it bouncing off in the first place, but also the distance it travels off-center if it does bounce off of something

2. Fire rate from Vile Acceleration, the 2.0 multishot, and lowered projectile speed all assist in orb-stacking

3. Lowered projectile speed means less distance needed to travel to be directly behind the stacked orb (matters a lot, ESPECIALLY if you are using this with razorwing Titania, although she does have an easier time positioning herself, due to blink-dodge and [Razorwing Blitz])

4. Enemies should be grouped for best results anyway, Lantern (especially with [Beguiling Lantern], which helps your damage) has my recommendation for this

5. Bouncing is bad because of falloff, regardless of whether we have [Primed Firestorm] slotted or not