In the depths of winter, among the highest peaks of the fearsome Dragonspine range, the dragons hibernate. The dragon hunter must climb to the frigid heights and find a solitary dragon. The solitary dragons are always fully-grown bull dragons, the most dangerous dragons. The hunter must creep into the dragon's cave and cut its throat with an obsidian knife, as metal is too dull to cut the skin and could spark, which would cause the dragon to catch fire and incinerate them both. He must skin the dragon within hours, as it rapidly gains weight upon dying, and would otherwise be immovable, and must extract the skull within days lest it carry the stink of rot forever. No part of the dragon is edible, but its liver is prized as fertilizer and its mucus as fuel for starting fires.
A dragon hunter who can bring back one skull and one hide each year will be prosperous, as the hide makes the toughest, lightest and most flexible armour known, and the skull may be made into the famed dragonbone tinderboxes, which light in all weathers.
He will also be very lucky to be alive, as dragons sleep uneasily in their winter hibernation. The older a dragon is, the more profit it will bring, but the lighter it will sleep and the worse its temper will be.