Legacy of the Four Winds
From Compendium of Worldly Lore
Needs review
Source: Way of the Samurai
Description: You lash out at anything that attacks you
Prerequisites: Base Attack Bonus +8, Mounted Combat, Ride-By Attack
You may immediately make one attack of opportunity per round against anyone who attacks you in melee, even if it is not an attack that normal provokes an attack of opportunity.