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Source: Player's Handbook

Description: Your knowledge of a specific weapon is unrivaled.

Prerequisites: Weapon Focus, Base Attack Bonus +4, Weapon Proficiency

Required for: Epic Weapon Specialization, Greater Weapon Specialization, Ranged Weapon Mastery

Choose one type of weapon, such as greataxe, for which you have already selected the Weapon Focus feat. You can also choose unarmed strike or grapple as your weapon for purposes of this feat. You deal extra damage when using this weapon. You gain a +2 bonus on all damage rolls you make using the selected weapon.

Special

You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new type of weapon. A fighter may select Weapon Specialization as one of his fighter bonus feats.