Hildryn's Arsenal | Viral Radiation Balefire for Full Stripped Steel Path
General Use for Grineer/Corrupted/Corpus:
Viral Damage is because when you fully armor strip enemies in one cast, grineer/corrupted cloned flesh health takes 75% bonus damage to Viral. Any bonus viral procs further increase damage to health.

Radiation Damage is mainly a side effect of using Primed Heated Charge which is a huge boost to base dmg due to its 165% bonus. Radiation has a bonus damage against Alloy Armor (which will be stripped).

Alternative element is just Viral + Electric, where you can swap Primed Heated Charge for Convulsion.

If you don't full strip with Pillage (which is unusual since just spamming pillage will eventually full strip), you could run Corrosive + Heat instead, which is also very good against unstripped acolytes, thrax and deimos infested.

For Crit Balefire: Run Arcane Avenger for flat 45% crit chance boost and swap either Lethal Torrent or Primed Heated Charge for Primed Target Cracker. Do NOT use any Crit Chance mods as the bonus will be extremely low due to the low base crit chance.