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Greater Weapon Specialization (Combat)

Source PRPG Core Rulebook pg. 126
Choose one type of weapon (including unarmed strike or grapple) for which you possess the Weapon Specialization feat. Your attacks with the chosen weapon are more devastating than normal.

Prerequisites: Proficiency with selected weapon, Greater Weapon Focus with selected weapon, Weapon Focus with selected weapon, Weapon Specialization with selected weapon, 12th-level fighter.

Benefit: You gain a +2 bonus on all damage rolls you make using the selected weapon. This bonus to damage stacks with other damage roll bonuses, including any you gain from Weapon Specialization.

Special: You can gain Greater Weapon Specialization multiple times. Its effects do not stack. Each time you take the feat, it applies to a new type of weapon.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 122
Once per round, you can spend 2 stamina points to gain your Greater Weapon Specialization bonus on damage rolls with another weapon. This bonus lasts until the start of your next turn.