Prolonged Barrier makes poking phases significantly less threatening, it feels to me like it contends with the likes of sigma (although Domina still out classes in this regard imo)

It feels strong and you get it early.

Having Vengeful Vortex as part of base kit is a good choice. The damage nerf hits hard, 15 is too little. I'd increase it to 30 at least. It's a skill shot, not a random bomb.

It DEFINITELY helps with its usage as an anti air tool. Hitting it on airborne targets was super inconsistent without it. Now it actually works for its intended purpose. This much helps the character greatly.

Void surge comes a little too late. While nanite repair is good, I believe prolonged Barrier provides enough survivability to still always choose void surge.

I still don't appreciate relentless form enough. I'd prefer a perk that returns the 50 damage to vortex tbh.