95% gloom Banshee for hunting Liches/Sisters
Pop a status effect, cast gloom, you're set!

Can't choose which augment I want.
[Sonic Fracture] seems great on paper but Sonar is overkill anyway
Resonance seems like a good fit but because it only procs once every 5 seconds, I'd rather just spend ~120-180 energy and spam Sonar three times next to the priority target
[Savage Silence] is funny, a bit unneeded though since 95% slow is already insanity

Adding more range requires swapping out something and makes it harder to "jiggle" enemies in and out of Silence range to keep them stunned. [Umbral Vitality] can be dropped as Gloom will only drop to 94% slow but that does hurt survivability a tad. [Blind Rage] & [Streamline] can be replaced with Transient Fort and [Augur Secrets] but you should switch [Primed Sure Footed] for [Power Drift] to get back to 95% slow. Without [Power Drift], you only hit 91% slow which is effectively double speed vs. 95% slow (actual speed = 9% vs 5%... it's seriously a noticeable difference).

Arcane Energize is mandatory, more or less. It's relatively easy to keep Gloom up indefinitely even without Energizing Dash from space kid though Energizing Dash does increase energy as long as 0 enemies are in Gloom's range which is another reason to not add range mods!