Duelist of the Roaring Falls (Combat)Source Inner Sea Combat pg. 10 (Amazon)
You have embraced the Roaring Falls method of Aldori swordplay, known for its elegant, sweeping strikes.
Prerequisites: Aldori Dueling Disciple, Exotic Weapon Proficiency (Aldori dueling sword), Weapon Finesse, Weapon Focus (Aldori dueling sword), base attack bonus +5.
Benefit: When you deal damage to a shaken, frightened, or panicked foe, you can add your Dexterity bonus to damage rolls instead of your Strength Bonus. You do not apply 1-1/2 times your Dexterity bonus to damage rolls while fighting two-handed. If you can already add your Dexterity bonus to damage rolls, you instead gain a +1 competence bonus on damage rolls with an Aldori dueling sword.
When you attempt a dueling parry during a duel, the penalty on your attack roll to parry is reduced from –5 to –3.
To gain these benefits, you must be wielding only an Aldori dueling sword (not using a shield, an off-hand weapon, armor spikes, unarmed strikes, or natural weapons).Source Weapon Master's Handbook pg. 24 (Amazon)
When you hit a foe with a melee attack made using an Aldori dueling sword, you can spend 4 stamina points to treat that foe as being shaken for the purpose of gaining a bonus from Duelist of the Roaring Falls until the start of your next turn.