[Galvanized Aptitude] is currently bugged with a lot of weapons. I'm not entirely sure if this goes for the [Ignis Wraith] currently, but I'd be wary for now. Once it does work correctly, this will probably be among the highest damage builds for the [Ignis Wraith]. [Galvanized Aptitude] will add 80% flat damage bonus per status on the target, which means without anything else applying statuses, you'd already get 240% flat damage from the heat, viral and slash procs, and the [Ignis Wraith] is really good at applying all of those very quickly.

Since Viral doesn't work on infested, and corpus shields will kinda ruin your day, you'll have to adjust the build a little. For Infested, replace [Primed Cryo Rounds] with [High Voltage] (for corrosive) and replace Hunter's Munitions with [Vile Acceleration]. For Corpus, replace [Malignant Force] with [High Voltage] (for magnetic).

Add a secondary primer for more statuses if you want to make use of [Galvanized Aptitude] even more, or even an melee primer, who would've thought anybody would ever be saying that.

With the added flat% bonus damage we're getting from [Galvanized Aptitude] and the new primary arcanes, switching out [Serration] for something like [Vile Acceleration] is going to be better. Definitely do this once you farmed up your Primary Arcanes.

Sadly, without swapping out [Serration], there's just no room for [Vile Acceleration] on this build, so using Arcane Acceleration on your warframe will make this build much, MUCH better. Or just use [Wisp] (or both).

I haven't gotten my hands on the new arcanes yet, but I think I'll be using Primary Merciless myself. Primary Dexterity looks really good too though if you like to use your melee as well.