Explain

Might not be the best one but still usable

Aura [Combat Discipline] with Arcane avenger for increase flat +45% crit chance and life steal from Gloom so you won't die using this build (even dead you still get benefit)

Arcane Energize for Energy [Regen]

[Primed Sure Footed] to prevent knockdown for using explosive weapons, (you can change if you didn't bring explosive weapon often)

[Rolling Guard] for nullify status like toxin, magnetic etc.

[Primed Flow] for Energy consumption of gloom when there too many enemies

2 Umbral mod for Ability Strength, Health and Tau Res (Sentient's damage)

[Streamline] for less energy consumption

[Stretch] for ability range

Replaceable

[Rolling Guard] > [Adaptation] if you want to play tanky

[Primed Continuity] > Energy Comversion for more Strength

Other build for [Sevagoth]

Reaper's Shadow
Shadow's Claw