Darsurion is an HERB that can be picked by those with the HERBS skill, or acquired from a merchant. While this herb can improve your learning session, be wary of overdosing.
Darsurion is a green lichen found and prepared by those with the Herbs skill. When consumed in water, darsurion will enhance your capacity to learn. For every lesson you take you will use three lesson credits but receive the benefit as if you had just taken five back-to-back lessons. It is worth always using darsurion whenever you learn, but beware, you only have a finite capacity for the herb and overdosing will render you ineffectual at learning and teaching for a time.