So this is a build I've been running for a bit, best used in Survival missions or any long endless mission where you're sitting in one spot. (Interception, Excavation, Defense, Void Armageddon, ETC.)

The way it works is you basically spam Bastille (the long hold succ version) and immediately follow up with Spectorage around the Succ(tm). Now what makes this build so special is [Spectrosiphon], which gives a 50% chance at dropping an energy orb at maxed rank.

Now the funny thing about Bastille is that, the long hold form of Bastille pulls all enemies in a radius to one spot. Put Spectorage around it and start blasting and you essentially have an endless pool of energy for yourself and your allies. It's very low maintenance and easy to set up, you could probably improve it using better mods but these are the ones I use since I don't go out of my way to get end game stuff usually.

But if I had to pick alternatives you can probably replace [Stretch] with [Archon Stretch] if you're a fan of the Tesla Nervos (since they do electricity damage technically, but with so low strength what's the point), alternatively you can also subsume your first ability for Spectorage rather than your third, I personally did third because I'm not using it at all. If you want even more Duration you can also slot a bunch of Crimson Archon Shards too.

The Reason [Adaptation] is at R8 rather than R10 is 1) I don't have enough endo to max it lol 2) I heard max [Adaptation] is virtually indistinguishable from a R8 [Adaptation] so it's not worth the extra endo to max it. Something like that.

Arcanes you can use whatever, I don't really think about arcanes when making builds so that's up to you to decide and improve upon, really this is just a simple build used to make endless-type missions super easy to deal with. The bonus is you can flashbang your teammates too by gathering a bunch of energy orbs and spamming bastille until you make the [Singularity](tm)!

But yeah, I wanted to share this build since I rarely see Vaubans running this set up and I think it's extremely goofy and borderline illegal what this does lol. Have fun making end game endless missions a trivial breeze!

PS: If you have trouble dealing with Eximus units, while it's not a perfect solution, running a Hound with [Null Audit] tends to help a lot, at least that's what I run.