[Hildryn] is able to abuse shield gating to become nearly unkillable with the correct mods. This build attempts to get the most out of her passive while also having access to all of her support potential. We subsume an ability that gives us more shields or one of the few abilities that synergize with the ability stats.

Rebuild Shields is chosen as it gives you a chance to refill your entire shield bar after you've been drained down to nearly 0. Elemental Ward Electricity is useful for giving you a small boost of shields without having to deal with the cooldown. Condemn is an option against Infested enemies.

Balefire is replaced as it's both weak and a waste of precious shields on this build.

Shield Recharge is extremely important for this build. The downside of abusing your shield gate is that you may be put into scenarios where you won't have enough energy to cast abilities. This synergizes with her passive that sets her Recharge Delay to 0 when you pick up an energy orb.

Range is pumped to the max so that Aegis Storm spawns more energy orbs. Each of these is a chance at getting your shields back. [Vacuum] mods may have negative synergy with this build so equip them on your pets with caution.

Efficiency is boosted by [Fleeting Expertise] which gives us double synergy with stats. Duration is intentionally lowered to the minimum so that Pillage will instantly refill your shields when it's cast. This is important when trying to chain shield gates or use the split second of full shields to get more shields back under heavy fire.

Strength is mainly boosted by [Transient Fortitude] which is run mainly for the negative duration rather than the actual Strength. It increases you shield and armor stealing on Pillage at the very least.

[Redirection] increases your shield regeneration rate due to the interaction with Shield Recharge mods and maximum shields. It should be replaced with [Rolling Guard] against high level enemies as you may need a second source of survivability to stay safe in some scenarios.

Although the Shield Recharge mods are technically a bit overkill in most scenarios, you should experiment on your own against the content that you usually do before you try to remove them. Realize that when you're under heavy fire you sometimes only have a second or two of recharge and every bit of shields gained will make a difference.

Arcane Barrier and Arcane Aegis synergize heavily with your build. When either proc you get a huge amount of shields back. All you have to do to proc either is keep yourself invincible and get even the tinniest amount of shields back.

*NOTE
This build utilizes some very interesting interactions. If DE decides that these interactions were not intended, the build is still serviceable. It just doesn't work as well. For all intents and purposes most of the interactions have been in the game since her release.