"They are for you. To use when you need them." She thinks for a moment, and then clarifies, "To use when you think you might possibly need them, really, they take time to redeem and the warding is more of the point than the anaesthesia, because, well, that does not actually heal injuries. I would really prefer that you use them when you do not wind up needing the protection than not doing so and needing it. --And you can and should let me know when you run low so that I can make more."