Please see the full guide for more details.
This is an alternate, theory-crafted build of my [Sanctuary] Onslaught [Mirage] build for those that don't have Arcane Energize.
Instead of using Empower like the previous build, we take a hit to efficiency and power strength to increase the duration from 13% to 127%, and replace Empower with [Protea]'s Dispensary, to reduce the need for Arcane Energize.
Since the duration is now higher than before, you could also use [Rhino]'s Roar with this build (replacing Eclipse, as it only affects weapon damage), and achieve ~39s of 76% increased damage. However, the high cost of energy for Roar and Sleight of Hand in this case made it difficult to keep energy up, even with Arcane Energize. This setup does, however, do more damage than the original build, and might be more viable for ESO, with support.