Duelist of the Shrouded Lake (Combat)Source Inner Sea Combat pg. 10 (Amazon)
You have embraced the Shrouded Lake style of Aldori swordplay, known for its circuitous and canny footwork.
Prerequisites: Aldori Dueling Disciple, Exotic Weapon Proficiency (Aldori dueling sword), Weapon Finesse, Weapon Focus (Aldori dueling sword), base attack bonus +5.
Benefit: When attempting a combat maneuver to bull rush or reposition a foe, you gain a +1 insight bonus on combat maneuver checks and a +4 dodge bonus to AC against any attack of opportunity you provoke. You also gain a +1 insight bonus to CMD against bull rush and repositionAPG attempts.
When you attempt a dueling dodge during a duel, your bonus to AC increases to +6.
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)
By spending 5 stamina points when you attempt a combat maneuver check with an Aldori dueling sword, you gain a +4 bonus to your AC against attacks made by that target until the beginning of your next turn.