Use your Prism and run around killing everything.
Use roar when you have spare energy
Change out either [Umbral Intensify], [Stretch] or [Rolling Guard] with [Streamline] if you don't have energize.

Strength is not needed as the prisms damage is increased by 100% for every enemy hit.

[Brief Respite] can be changed out if you have a team or if you are more confident in your movement survivability than me but youu really don't need more damage