"A Zephyr is a source of unending power, like oil that never runs out or nuclear power that goes on forever. It could power very demanding rituals, especially Dark Magic. Since the Zephyr is just air, it can be very small or enormous. Draco and Theo had found a way to contain or harness it. Everyone wants it. But we need to find it. It will be small, not even the size of a fingernail. Draco keeps saying you took it. I am sure you don’t have it on you."