With [Xaku]'s new augment you no longer need to build as much strength to get 100% armor strip. As long as you rotate the lost you have permanent 105% bonus additive power strength.
Helminth is preference gloom and resonator work great for additional survivability. Use what you like. Same for exilius.
To make more efficient and increase build power you would change [Transient Fortitude] to [Umbral Intensify] and [Vitality] to [Umbral Vitality] requiring much more forma (at least 1 umbral)
Unlike other [Xaku] builds this one contains great flexibility. The aura, the exilus, [Primed Flow], and grasp of [Lohk] augment could all be swapped to anything else you like.
Replace primed versions with normal versions of you don't have them.