-This is a build for the beam mode of Incarnon upgraded Atomos.
-An unprime Convulsion is interchangeable with Pathogen Rounds.

-Incarnon Evolutions:
II) I'm sorry to say that unless your frame can achieve Paladin Virtue's requirement (Archon Flow and/or Archon shards), you're demoted to Hoplite Virtue which makes this a worse corro-heat KNukor (https://overframe.gg/build/491104/).
III) Preference. I don't think 2s reload warrants using Resonant Restore's magazine increase, so I'd personally go ammo evolution (Mercenary Chamber) + range exilus or range evolution (Moonrise Velocity) + ammo exilus. 21 pickups with ammo exilus (12 with primed version) are needed to break even with Mercenary Chamber.
IV) Commodore's Fortune yields max dps. Viral heat SP config (https://overframe.gg/build/492124/) & 2 emerald shard Corro heat SP config (sentence below) uses Survivor's Edge.

BUILD DETAILS
-If you are running 2 Emerald archon shards (highest possible dps even vs SP armor) replace Convulsion mod with Scorch & Commodore's Fortune evolution with Survivor's Edge.

-Even if [Galvanized Shot] doesn't work fully (only takes into account base dmg without evolution II), its status chance helps achieve 10 corrosive procs per half a sec, stripping enough armor to outdamage other options.

-It may sound weird but Expel, primed or not, [Primed Heated Charge] or [Hornet Strike] all yield lower dmg vs armored targets than any of these mods (math is behind this). It is a delicate balance between base dmg (Cascadia Flare, GShot), status chance till 10 corro stacks/0.5sec (60-60 corro) & corro dmg (3rd corro mod).

-With this build alone, you possess the best AoE secondary beam in the game (~23% faster than Nukor overall, even if main beam is ~24% lower dmg). But with a well-rolled, well-slotted riven, you can elevate [Atomos] to even greater heights (a good riven can even surpass KNukor on the main beam). Red Archon shards only add to the fun.

-Don't add more fire rate instead, it'd waste ammo too quickly in lengthy/low enemy density missions.

-On SP Corrupted/Grineer missions and if you don't run 2 emerald shards (but ONLY then!) this build kills faster: https://overframe.gg/build/492124.