I still need to get a riven with effects along the lines above. General idea is to max out on boons and curses, but +Heat and +Status Chance for priority heat procs, -Crit Chance, +Multishot for extra DPS.

Replace [Rime Rounds] with [Thermite Rounds] to get radiation for Archons

Evolutions

Each challenge additionally grants 5,000 affinity to the weapon

Evolution I: Incarnon form

Unlock: Kill 100 enemies with the Phenmor.

Effect: 12 headshots (less with multishot) lets you switch to Incarnon mode after alt-fire. Instead of drawing ammunition from its reserves, the [Phenmor]'s Incarnon Form uses a separate "magazine" with each charge producing 34 rounds to a maximum of 408 rounds.

Evolution II: Void's Guidance

Unlock: Kill 8 Eximus with the Phenmor's Incarnon Transmutation.

Effect: +50% Accuracy and -50% Recoil. The combination of this perk with Primary Deadhead gives -100% recoil. If you run [Stabilizer] in exilus as well as primary deadhead, you can run Rapid Wrath (+20% fire rate) instead.

Evolution III: Ready Retaliation

Unlock: Land 20 headshots on Void Angels with Primary fire without reloading.

Effect: +100% reload speed for 6s when reload from empty. This actually also affects the transformation time, cutting it down from 3.4s to approx 1.7s if you manage to reload from empty.

Evolution IV: Elemental Excess

Unlock: Close 12 Ruptures in Void Flood

Effect: +20% status chance, -10% critical chance. This drops the final crit chance to 10% to synergize with Devouring Attrition and makes the final status chance approximately 70%.

Evolution V: Devouring Attrition

Unlock: Complete a Solo mission with an Incarnon Weapon equipped in every slot

Effect: 50% chance to deal 2000% damage on non-critical hits. This 2000% multiplier is currently a separate multiplier to base damage mods such as [Serration], deadhead, [Galvanized Aptitude]