General | Combat Stamina
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Improved Low Blow (Combat) Source Advanced Race Guide pg. 66 You are adept at hitting larger opponents where it hurts. Prerequisites: Base attack bonus +4, halfling, low-blow racial trait. Benefit: Your bonus to confirm critical hits against opponents larger than yourself improves to +2. Furthermore, once per day, after you fail to hit with a critical hit confirmation roll, you can reroll the confirmation roll, but must take the new result even if it is worse. Combat Trick (from the Combat Stamina feat) Source Pathfinder Unchained pg. 123 You can spend 5 stamina points to reroll a second critical hit confirmation roll in the same day.

Improved Low Blow (Combat)

Source Advanced Race Guide pg. 66
You are adept at hitting larger opponents where it hurts.

Prerequisites: Base attack bonus +4, halfling, low-blow racial trait.

Benefit: Your bonus to confirm critical hits against opponents larger than yourself improves to +2. Furthermore, once per day, after you fail to hit with a critical hit confirmation roll, you can reroll the confirmation roll, but must take the new result even if it is worse.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 123
You can spend 5 stamina points to reroll a second critical hit confirmation roll in the same day.

Archives of Nethys

Improved Low Blow (Combat)

Combat Trick (from the Combat Stamina feat)