Aldori Style
You have learned the classic Aldori dueling stance.
Prerequisite: Alertness, Exotic Weapon Proficiency (Aldori dueling sword†), Weapon Finesse, Weapon Focus (Aldori dueling sword†).
Benefit: While using Aldori Style and wielding only a single Aldori dueling sword in one hand (not using a shield, an off-hand weapon, armor spikes, unarmed strikes, or natural weapons), when you fight defensively or use Combat Expertise, you gain a +2 bonus on weapon damage rolls.
Source: Adventurer's Guide, p. 24