It's a role-playing subclass that represents one’s honor and chivalry in a one-on-one fight. You gain various bonuses during a duel, or some support skills to make a fight one-on-one. On the other hand, to display a “respect for a duel of honor,” poison skills and deceptive attack skills are forbidden. In other words, it would be a terrible decision for an Assassin to pick this subclass. This subclass is powerful in a one-on-one duel, but is less effective in group-on-group battles, so it’s pretty unpopular. Its benefits are outclassed by other fighter subclasses, but it can be useful for solo players.