General | Combat Stamina
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Critical Focus (Combat, Critical)

Source PRPG Core Rulebook pg. 120
You are trained in the art of causing pain.

Prerequisites: Base attack bonus +9.

Benefit: You receive a +4 circumstance bonus on attack rolls made to confirm critical hits.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 116
If your successful critical confirmation roll is a natural 19 or 20, you can spend 2 stamina points to roll another confirmation roll. If this confirmation roll also succeeds, increase your critical multiplier by 1 for this attack, and you can roll again. If you continue to roll 19 or 20, you can continue to spend stamina points for additional rolls, and the increases to the critical multiplier stack.

Mythic Critical Focus

Source Mythic Adventures pg. 61
Your blows unerringly find your target’s vital spots.

Prerequisites: Critical Focus.

Benefit: You automatically confirm critical threats against non-mythic opponents. In addition, when you threaten a critical hit against a creature wearing armor with the fortification special ability or similar effect, that creature must roll twice and take the worse result when determining critical hit negation.