Yabo's Request

Do you already know that a plague is raging in our village? This disease is not dangerous, but it is highly contagious. There are countless sick people, and we are running out of medicine. Will you help me find Magic Gravel? It forms in the stomachs of deer that feed on Iris's magical herbs. Great power is contained within it. Please bring me these stones. I will make medicine for the plague from them.