The kensei masters body, mind, weapon, and will. He devotes his strength and his life to the service of a master or an ideal he accepts as greater than himself. Some kensei become masters in their own right, but even one who becomes an emperor sees himself as a servant of some higher power.
Most characters who become kensei aspire to the class from the beginning of their careers. Often, other kensei or elite military organizations train likely young men and women in the principles of service, the arts of war, and the purity of mind and body necessary to become a kensei.
A kensei can be a lone adventurer, serving an ideal or attempting to fulfill a lifetime goal. Some kensei swear fealty to great lords and rise to become trusted bodyguards, warlords, or leaders in the lord's service. Monks and paladins know the strenuous road a kensei must travel, and some tread that path.