General | Combat Stamina
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Dastardly Finish (Combat)

Source Advanced Player's Guide pg. 157
You can take advantage of an enemy’s debilitated state to attempt a coup de grace.

Prerequisites: Sneak attack +5d6.

Benefit: You can deliver a coup de grace to cowering or stunned targets.

Normal: You can only coup de grace helpless targets.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 116
You can spend 10 stamina points to deliver a coup de grace against two helpless, cowering, or stunned targets within your reach as a fullround action. This provokes attacks of opportunity twice—one for each coup de grace.

Mythic Dastardly Finish

Source Mythic Adventures pg. 61
You strike downed, dazed, and staggered opponents with deadly efficiency.

Prerequisites: Dastardly FinishAPG.

Benefit: You can deliver a coup de grace to dazed and staggered non-mythic opponents. In addition, when any creature makes a Fortitude saving throw to survive one of your coup de grace attempts, it takes a penalty to that saving throw equal to your tier.