Elven Battle Focus (Combat)Source Weapon Master's Handbook pg. 12
Your fighting style is enhanced by your keen intellect.
Prerequisites: Int 13, Elven Battle Style, Elven Battle TrainingARG, Weapon Finesse, base attack bonus +4, weapon familiarity racial trait.
Benefit: While using Elven Battle Style, you can add your Intelligence modifier to that weapon’s damage (instead of any other ability bonus or modifier you can add to your weapon damage). The weapon must be one appropriate for your size.