Maybe something Incarnum-y in reference to his default color being blue? Say...
Soul Tempest
Sandbox Goliath (boost)
Level: 5
Prerequisites: 1 Sandbox Goliath maneuver
Initiation Action: 1 swift action
Range: Personal
Target: you
Duration: one round; see text
Each time you successfully attack an enemy this turn, you gain one free point of essentia which you can add to any one of your essentia receptacles as a free action, ignoring essentia capacity. Essentia gained through this boost is lost at the end of your next turn.