overload unicorn

But for causing pain, there wasn’t better fuel than pain itself. So, though it hurt, viciously, I fought to take hold of that power and started shaping it with my thoughts as the unicorn rushed forward. But I’d never had that much energy rush into me that quickly before.
Hell’s bells, what had just happened to me?
Flickers of green-gold light began to gather along the unicorn’s central horn, and I suddenly understood.
I had various tools, like my staff, created to help me gather, focus, and direct power.
As did Mab.
It was everything I could do just to hold on, and the unicorn had more acceleration than a Maserati. We started closing the distance to the enemy with alarming rapidity.
I shoved my staff at Butters and shouted, “Hold this!”
He fumbled and managed to take it, and I leaned forward and laid my right palm on the unicorn’s neck.
The creature’s horn flared with pure power, became incandescent with gold-green light, and I felt the humming channels of power rushing through the body of the immortal creature, just like when I sent energy into my staff—only that was like comparing a drinking fountain to a firefighting company’s equipment. I might have been holding more energy than I ever had before, but this creature had been designed to focus and enhance Mab’s power. I couldn’t have overloaded it if I’d tried.

Battle Ground Chapter 29, Page 276