Plain and simple. Use Empower, set up a multi-mote, use Empower again and then use your Kamehameha.
Hold the attack button to increase damage output.

Use Empower before any ability you use.

But what about the energy drain!?
Well well youngster, that's where [Hunter Adrenaline] kicks in.

But then what about survivability!?
Adaptability and Arcane [Guardian]! Pfew! But that's not all, Arcane [Guardian] adds 900 armor, when it triggers.