Elven Battle Torrent (Combat)Source Weapon Master's Handbook pg. 12
You rapidly counter enemy attacks.
Prerequisites: Int 13, Elven Battle Focus, Elven Battle Style, Elven Battle TrainingARG, Weapon Finesse, base attack bonus +10, weapon familiarity racial trait.
Benefit: While using Elven Battle Style, any opponent that makes an attack against you and misses while you are fighting defensively or using total defense or the Combat Expertise feat provokes an attack of opportunity from you. Even if you have Combat Reflexes, you can’t benefit from this feat more than once per round.