General | Combat Stamina
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Critical Versatility (Combat)

Source Advanced Race Guide pg. 76
An open mind and combat training grant versatility to your critical hits.

Prerequisites: Fighter level 11th, human.

Benefit: Once per day, you can spend 1 hour practicing maneuvers to gain one single critical feat that you meet the prerequisites for. You gain the benefits of the chosen critical feat until you choose to practice a different critical feat.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 116
You can spend 5 stamina points to use this feat a second time per day.