Radiant: A Novel - Karina Sumner-Smith
"This is what I am, she thought. The balance. The coin’s other side.
This is who I am: a bridge between darkness and light.

And the magic flowed. It rose slowly at first, sluggishly. It felt cold, like a thin stream of melted ice rising through her, and where it met the bright energy Xhea burned, too hot and too cold. Still she called to it, welcomed it, and as the magic moved through her the brightness began to give way."