"Do not worry, the jar is thick. It will not get out." Joanna replied, though she returned the jar to her bag as she handed the ring over. "The magic of the ring protects the life of its wearer when they are in great danger. If you are wounded, or sick, or poisoned, this ring will gird your body against any further physical harm. It is not a powerful effect, but it means that if your life is ever in severe danger, this ring will give you a small chance to survive where you might have none otherwise. I do not know how much you would need it in a city this... astounding, but if anything were to happen at some time, then this ring may be worth having."