Hi, this is my experimental Ability Duration build for [Protea].
What she lacks in power, she makes up in battlefield presence. I chose to maximize duration, to profit from her resupply skill, as well as achieving a 9-second duration for her plasma cannons, which have now sufficient presence to actually make their scaling damage count.
Also, Shrapnel Grenades and Shield Satellites will have now a longer-lasting effect.
Protea's kit is highly duration-heavy, so I squeezed out every last millisecond I could.
Of course, I couldn't achieve this without sacrificing health mods, which don't even matter in high-level endurance runs anyway, cause at those levels you get one-shotted anyway if you're not an [Inaros] level tank.
As for arcane, I chose Energize, because it synergizes well with her resupply skill, and I can keep up an almost constant supply of energy.
Arcane Ultimatum is just a personal choice, so I can use it with Bronco Prime outfitted with Dizzying Rounds, which is an on-demand finisher, granting [Protea] a big chunk of armor, thus making her more durable.
This is mainly a support build. Try it out, see if it works for you. Feedback is appreciated. Cheers.