[Hildryn] has a unique "energy" economy that allows her to infinitely spam her abilities by simply letting her shields regenerate. We combine this with a subsumed buffing ability to give her and her team a consistent source of free QoL or damage.
Balefire is replaced because this is primarily a support build but you can replace Haven if you're going solo or Pillage if you're going against legacy Infested.
Nourish, Smite, and Shock all increase the elemental damage of your weapons and even some of your abilities. This lets you save a mod slot or two on your other builds in your loadout. Nourish is the easiest to slot in as it doesn't require an augment but you can replace [Augur Message] is you want to run the other element buffs.
This build can also work with other damage buffing abilities like Xata's Whisper, Eclipse, or Roar. It even works with hybrid defensive/offensive options like Elemental Ward or Warcry. We don't really need those buffs to kill enemies but they can help you and your team to run unconventional or off-meta weapons.
[Enemy Radar] mods help us to find enemies. Due to the nature of the build we need to sometimes seek out stragglers.
[Adaptation] can be switched out for [Rolling Guard] against high level content.
[Fast Deflection] gives you shields back more quickly in between enemy waves. It can be replaced with more survivability or [Narrow Minded] on solo focused builds.
[Augur Message] is a flex mod that can be replaced for augments or other augur mods depending on which ability you choose to subsume.
Arcane Barrier and Arcane Aegis are defensive tools that significantly increase the QoL on [Hildryn], especially when they're run together. Either can be swapped out for offensive arcanes or even Arcane Resistance.