Talk:Ignis/@comment-101.162.142.6-20151023143542/@comment-82.76.87.2-20151026013152

On both the Ignis and any shotgun (due to Blaze), I use Corrosive+Heat for Grineer, Blast+Toxin for Corpus, and Corrosive+Blast for Infested, Radiation+Viral for Orokin.

Note how you mentioned gunners. Problem is those have Ferrite armor, so it's clear Corrosive+Heat will always be better then Rad+Viral. For something like Bombards though (Alloy armor), it'll be the opposite, as Radiation will bypass 75% of their armor from start to finish (though I'd suppose if you'd go high enough level-wise, even that 25% armor could slow the dps down enough to warrant switching to Corrosive).

High-end Grineer missions tend to have more Gunners, while high-end Orokin missions seem to have more Corrupted Bombards, so that's why I modded as I did.

Toxin bypasses shields and has a 25% bonus towards flesh, so it's great vs. Corpus... only problem are the Oxium Ospreys, but they're few and better handled with a high dmg-per-shot side-arm like the V.Marelok. Since Ignis forces you to have Fire in your elemental combination, I chose Blast as the first element - normally I'd use Magnetic, but Blast does have it's strenghts, specifically CC and the fact that no Corpus unit actually has any resistences against it.

Corrosive+Blast is the best possible dmg combo against the Infested's tanks - meaning Ancients, BroodMothers, Boilers, InfestedMoa's and anything else that's Fossilized - particularly important due to Healers making entire mobs virtually immune to dmg until taken out. You really don't need to mod against the more squishy Infested, but fortunately none of them have reduced dmg against Corrosive or Blast and Blast CC's them quite effectively on top of that. Only real bother are the Charger Eximi, but even those only have a 25% dmg reduction to your wave-o-knockdown.