The Vitrian Dragoons are an Imperial Guard regiment from the world of Vitria. The Dragoons stem from a martial culture formed entirely around the Vitrian Honour Code, the Byhata, an ancient treatise on warfare. Every Vitrian Trooper carries his own copy of the Byhata on his person at all times, even into combat. Tradition states that the Byhata should be carried in a special pocket under the trooper's armour, directly over his heart. Every copy of the Byhata is fitted with a lock that is gene-coded to the owner, so that only he may open the book. In the Vitrian culture, it is a capital offense for anyone other than a Vitrian to gain access to or read the Byhata.