PFSRD:Greater Weapon Focus
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Greater Weapon Focus (Combat)
Prerequisites: Proficiency with selected weapon, Weapon Focus with selected weapon, base attack bonus +1, 8th-level fighter.
Benefit: You gain a +1 bonus on attack rolls you make using the selected weapon. This bonus stacks with other bonuses on attack rolls, including those from Weapon Focus.
Special: You can gain Greater Weapon Focus multiple times. Its effects do not stack. Each time you take the feat, it applies to a new type of weapon.