Wouldn't it be cool to learn a power from the Arcanum Master's? It would buff you up and be like a last ditch effort thing. It only starts when maximum health drops below 20%. It would look like an aura but it would instead make your character glow the color of your school theme.
Might of Myth -- +5% resist +10% damage +20 critical
Heat Wave -- +5% resist +15% damage +10 critical
Eye of the Hurricane -- +10% resist +5% damage +25 critical