Phenmor

Phenmor Raw Viral Heat (Patch 33.6)
Phenmor Viral Slash (Anti-armor) (Patch 34.0)

Phenmor Raw Viral Heat (Patch 33.6)

PATCH VERSION	33.6
MASTERY REQUIRED	14
FORMA REQUIRED	3
ENDO REQUIRED	144,610

INCARNON OPTION 2	Void's Guidance	+50% Accuracy and -50% Recoil while Aiming Affects both modes.
INCARNON OPTION 3	Ready Retaliation	On reload from Empty: +100% Reload Speed for 6 seconds Affects untransformed Phenmor. Can affect transition into Incarnon mode with a well-timed manual reload. Does not affect transition from Incarnon back to semi-auto.
INCARNON OPTION 4	Elemental Excess	+20% Status Chance -10% Critical Chance Affects both modes. Effects are added last after mods as a flat number.
INCARNON OPTION 5	Devouring Attrition	50% chance to deal +2000% damage on non-critical hits Affects both modes Damage bonus is multiplicative to base damage bonuses such as Serration.

The Devouring Void | Raw Viral Heat Phenmor

Non-crit Raw Damage Viral Heat build enough to kill pretty much all content very quickly and even scales in steel path without armor strip up to level 1000 thanks to the multiplier from Devouring Attrition.

Viral Slash alternative (scales higher without armor strip against Grineer/Corrupted): https://overframe.gg/build/315630/

Evolutions

Evolution I - Incarnon form - 12 headshots (less with multishot) lets you switch to Incarnon mode after alt-fire which has about 408 rounds
Evolution II - Void's Guidance - +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 - +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 - +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 - 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

Mod Explanations

Galvanized Chamber - +230% multishot at max stacks
Galvanized Aptitude - +80% dmg per status, so +320% with slash, radiation, viral and heat, or even more if you use an external primer.
Primed Shred - needed for fire rate and punchthrough
Primed Bane of Grineer - additional 1.55x multiplier. If you don't like bane you can replace for Amalgam Serration or Vile Acceleration
Viral - A single viral status proc doubles the damage of all subsequent damage, to a max of 4.25x at 10 stacks of viral. Viral also has a damage bonus against Cloned Flesh and Flesh possessed by Grineer and Corpus. [Rime Rounds] is a cheaper option over Primed Cryo Rounds, but you can use Primed Cryo Rounds for slightly more upfront damage at the cost of status if you add more forma.
Hellfire - Adds heat damage and procs. Heat procs strip up to 50% armor and can stack indefinitely to do damage, and have bonuses against Cloned flesh which is possessed by all Grineer units as well as
Thermite Rounds - This is the FLEXIBLE slot. I have placed [Thermite Rounds] here to further increase the heat weighting (so heat procs more often than viral and each heat proc does more damage per tick) while also giving more status chance (final status of 92% after elemental excess).

Flexible Options
If you want to invest more forma, you can swap Thermite Rounds or any other mod you don't own for any of the following flexible options:

Vile Acceleration - stack more fire rate with primed shred for highest sustained DPS (i.e. if you hold down fire and spam shots)
Amalgam Serration - additive +dmg to aptitude and deadhead but also gives bonus sprint speed
Primed Fast Hands - cuts a further 1 second from the transformation time (3.4s to 2.4s without Ready Retaliation active, or down to 1.5s when stacked with Ready Retaliation) and improves feel of non-incarnon mode.
Riven - look for +ms, +dmg, +fire rate, +tox, +reload speed wit negative crit chance.
Vigilante Armaments - slight boost to multishot

Building for Other Factions

For Corpus: Swap [Rime Rounds], [Thermite Rounds] and [Hellfire] for [Infected Clip], [Amalgam Serration] and Vile Accelation to make pure toxin to bypass shields, and swap bane mod.

For Infested: Swap Rime Rounds for High Voltage or Stormbringer to make corrosive heat, and swap bane mod.

For Thrax/Acolyte: Make raw corrosive by swapping [Malignant Force] for [Infected Clip], [Rime Rounds] for [Stormbringer] or [Jolt] and drop Bane mod for [Amalgam Serration]. Consider dropping [Primed Shred] and [Hellfire] for [Vile Acceleration] and Vigilante Armaments.

Xata's Whisper Synergy and Calculations

With all mods and multipliers at 4 status and max stacks, every non-critical single-projectile hit should do:
140 x (1+1.65+3.2+3.6) x (1+0.6+1.65 +0.9) x (1+0.55) x (1+20) = 178K damage

Combine with [Xata]'s Whisper for two insane effects:
1. Devouring Attritions 21x multiplier actually applies a second time to the void damage instance, which itself is weapon damage x [Xata]'s % multiplier x ability strength. This means you are actually getting a final multiplier of damage x 21 x 21 = 441x, or approximately 178,714*21=3,752,994 aka 3.7 million raw damage per shot before applying [Xata]'s multiplier and faction mods which apply a second time (double dip).

If you get a HEADSHOT with [Xata]'s, the void damage will actually double dip both deadhead (1.3x) and the headshot multiplier (2x) as well as dipping faction mod again (1.55x) giving a final headshot damage of approximately 3,752,9941.31.322*1.55=39 million damage.

[Xata]'s void bubbles seem to spin and ricochet [Phenmor]'s projectiles in a 360 degree range allowing you to hit an kill enemies adjacent to the initial target as shown in these videos:

Here is a video demonstration of the synergies with [Xata]'s Whisper:

Phenmor Viral Slash (Anti-armor) (Patch 34.0)

PATCH VERSION	34.0
MASTERY REQUIRED	14
FORMA REQUIRED	4
ENDO REQUIRED	145,640

INCARNON OPTION 2	Void's Guidance	+50% Accuracy and -50% Recoil while Aiming Affects both modes.
INCARNON OPTION 3	Ready Retaliation	On reload from Empty: +100% Reload Speed for 6 seconds Affects untransformed Phenmor. Can affect transition into Incarnon mode with a well-timed manual reload. Does not affect transition from Incarnon back to semi-auto.
INCARNON OPTION 4	Elemental Excess	+20% Status Chance -10% Critical Chance Affects both modes. Effects are added last after mods as a flat number.
INCARNON OPTION 5	Devouring Attrition	50% chance to deal +2000% damage on non-critical hits Affects both modes Damage bonus is multiplicative to base damage bonuses such as Serration.

The Devouring Edge | Viral Slash Phenmor (Anti-armor)

Standard Viral Slash build for high level Grineer and Corrupted. Slash status DoT bypass armor and this is magnified by viral status (4.25x) and faction mods (2.401x).

Raw damage build variant (shard polarities): https://overframe.gg/build/314745/phenmor/the-devouring-void-raw-viral-heat-phenmor/

Evolutions

Evolution I - Incarnon form - 12 headshots (less with multishot) lets you switch to Incarnon mode after alt-fire which has about 408 rounds
Evolution II - Void's Guidance - +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 - +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 - +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 - 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

Mod Explanations

Galvanized Chamber - +230% multishot at max stacks
Galvanized Aptitude - +80% dmg per status, so +240% with slash, radiation, viral or even more if you use an external primer.
Primed Shred - needed for fire rate and punchthrough. Flexible for shred.
Vile Acceleration - even more fire rate!
Primed Bane of Grineer - additional 1.55x multiplier to raw hit and 2.401x to bleed DoTs (banes double dip). If you don't like bane you can replace for Amalgam Serration or Vile Acceleration
Viral - A single viral status proc doubles the damage of all subsequent health damage, to a max of 4.25x at 10 stacks of viral. Viral also has a damage bonus against Cloned Flesh and Flesh possessed by Grineer and Corpus. We want to keep Slash weighting high so the chance of proccing slash per hit is higher than viral, but also have a high status chance.

You can either run max ranked tox + cold, unranked mods, or one max and one unranked. Increasing the rank improves your status chance but reduces slash bias, so while you have a higher chance per hit to proc any of the three statues, you will have a slightly lower chance that the status will be slash. Since viral caps at 10, you don't want the viral to be higher than slash as you will then have wasted status procs, but at the same time you want viral status to cap as quickly as possible to take advantage of the multiplier for as many hits as possible.

With both unranked viral, you will have 72% slash weight with 62% status chance giving 45% chance per bullet to create a slash proc and 12% chance to create a viral proc. This means with 3.3 multishot and 7.35 fire rate, you will have about 10.8 slash and 3.3 viral per second. While you gain lots of slash procs, it takes on average 3 seconds of shooting one target to hit 10 viral. With one rank 3 and one rank 0, you get 10.2 slash and 5 viral per second and with max rank you get 9.8 slash and 7.6 viral per second. You can see the differences become quite negligible with multishot and fire rate and either choice allows you to cap viral in 2s or less. Capping viral faster means you gain overall higher potential DPS as each subsequent slash proc becomes multiplied by 4.25x.

Fanged Fusilade - keeps slash weighting higher allowing us to rank up viral status mods
Primary Deadhead - Mainly chosen for headshot multiplier and recoil bonus. You can easily get direct headshot kills on weaker enemies. Can swap to merciless on very high levels where it becomes harder to get direct headshot kills.

Flexible Options
If you don't own one of the above mods, can sub for:

Hammer shot - slightly more status chance
Amalgam Serration - additive +dmg to aptitude and deadhead but also gives bonus sprint speed
Riven - look for +ms, +slash, +dmg, +fire rate, +tox, +reload speed with negative crit chance.
Vigilante Armaments - slight boost to multishot