General | Combat Stamina
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Double Slice (Combat)

Source PRPG Core Rulebook pg. 122
Your off-hand weapon while dual-wielding strikes with greater power.

Prerequisites: Dex 15, Two-Weapon Fighting.

Benefit: Add your Strength bonus to damage rolls made with your off-hand weapon.

Normal: You normally add only half of your Strength modifier to damage rolls made with a weapon wielded in your off-hand.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 118
When you hit an opponent with both a primary-hand attack and an off-hand attack while using Two-Weapon Fighting, you can spend a number of stamina points up to half your Strength bonus. If you do, add a bonus on the damage roll of the second of the two attacks equal to the number of stamina points you spent. You can use this combat trick only once per round.