In moments of great need, I can, for a short time, basically go super Saiyan. This is my solar form, and it gives me almost godlike levels of power, for a limited amount of time. After that, I need a long rest.
My existing fire and light magic gets overcharged, and they merge into a new element: plasma. That's the stuff that the sun is made out of, hence why I call it my solar form. My strength increases to allow me to pulverize mountains, and I can move so fast that I break the sound barrier several times over.
I undergo some physical changes too. Note the reversed color scheme, and a weaponized tail - basically a battleaxe in the shape of a shark's tail fin. In addition, I increase in body size a small amount.
The caveat is of course only being able to maintain this form for a short time - 20 minutes at utter maximum - and needing to physically recover for a long while after returning back to my normal self.
