Haven allows [Hildryn] to share her passive with allies while also giving them a massive shield recharge buff that scales off of her ability duration. We combine this with a subsumed CC ability to give her multiple ways to support the team.
Resonator is chosen because it protects your team and wrangles enemies. Ensnare and Larva could also work but to a lesser extent in certain scenarios. Dispensary is another decent option due to our high duration. We replace Balefire because it's terrible with low ability strength.
Duration is maxed because it increases the amount of shield recharge you give to allies. Range is as high as you can get it with [Narrow Minded] still on.
Strength is very low because the build doesn't make use of it. It even has synergy with Pillage because you can [Stretch] out how many times you can get shields back from enemies.
[Redirection] can be switched out for [Rolling Guard] against high level content.
[Enemy Radar] mods help you and your team to quickly find straggler enemies.
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.