|"We must've been through hundreds of books already and we can't find him anywhere —"|
The horn of a Dragon is a common potion ingredient. The powdered horn of a Romanian Longhorn is highly valuable and used in many potions. However, the excess trading of it caused the numbers of the Longhorn to fall considerably, and so the horn was rated a Class B Tradeable Material. The specific role of a dragon horn in potions remains unknown, however, like most Dragon parts, it is extremely magical.