[Valkyr] has a fairly balanced kit that struggles to stand out in any one aspect. This build attempts to give her a pseudo nuke through abusing the Mecha set mods while giving her decent survivability for harder content. We have a huge array of abilities that can subsume into this build.

Fire Blast is chosen because armor stripping allows you to more quickly burst down status immune enemies but Shuriken can serve that purpose as well if you sub in the augment. Buffs like Roar or Eclipse can help you to push additional damage. Defensive abilities like Elemental Ward can round out a more passive playstyle.

Paralysis is replaced as it's a ridiculously weak ability in most content. Weakening your shield gate to get a sub par finisher proc isn't worth APM loss. Rip Line can be used to manipulate defensive operative positioning but it's fairly weak as well.

[Mecha Empowered] and [Mecha Pulse] are needed to complete the Mecha set mods. Pulse even has synergy with her massive base armor.

[Vitality] can be replaced with [Rolling Guard] or [Steel Fiber] depending on the difficult of the content you're running and the type of Helminth ability you subsume.

Strength is fairly high to capitalize off Warcry or other buffs. [Transient Fortitude] can be replaced with [Blind Rage] on greedier builds.

Efficiency is raised a bit to accommodate your subsumed ability. [Streamline] can be swapped with more duration or strength if you're confident with your energy economy.

Duration is weird on [Valkyr] as it has weird synergy with her augments. A bit above baseline is usually the call.

[Eternal War] is chosen because it greatly improves Warcry. Any of the other augments can be chosen if you're fine with recasting Warcry to abuse the slow.

Arcane [Guardian] is still a large survivability bonus even on a high armor frame. It can be replaced with any other arcane to suit your playstyle.