The crucial part of this build is [Combat Discipline] + [Equilibrium] + Dispensary what makes your energy infinite even with 45% of efficiency, just stay near your dispenser and if you run far away from it, keep an eye on your health to not accidentally die by [Combat Discipline].

You can use any exilus and second arcane as you want, I just prefer [Preparation] for easy start and nullifier for saving overshields.