stored sunlight

I jerked my hand out of my pocket, and flapped open my white hanky at her, releasing the image of sunlight I’d been storing for use in potions. It lit up the room for a moment, brilliant.
The light smashed into Bianca, hurled her back across the old table into one of the shelves, and tore pieces of flesh away from her like bits of rotten meat being peeled off a carcass by a sandblaster. She screamed, and the flesh around her mouth sloughed and peeled away like a snake’s scales.

Storm Front Chapter 9, Page 103