General | Combat Stamina
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Combat Reflexes (Combat)

Source PRPG Core Rulebook pg. 119
You can make additional attacks of opportunity.

Benefit: You may make a number of additional attacks of opportunity per round equal to your Dexterity bonus. With this feat, you may also make attacks of opportunity while flat-footed.

Normal: A character without this feat can make only one attack of opportunity per round and can't make attacks of opportunity while flat-footed.

Special: The Combat Reflexes feat does not allow a rogue to use her opportunist ability more than once per round.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 115
When you miss with an attack of opportunity, you can spend 5 stamina points to make a second attack for the same provoking action. That second attack of opportunity takes a –5 penalty on the attack roll and costs one of your attacks of opportunity for the round.

Mythic Combat Reflexes

Source Mythic Adventures pg. 61
You strike viciously whenever your foe gives you an opening.

Prerequisites: Combat Reflexes.

Benefit: You can make any number of additional attacks of opportunity per round. As a swift action, you can expend one use of mythic power to, until the start of your next turn, make attacks of opportunity against foes you’ve already made attacks of opportunity against this round if they provoke attacks of opportunity from you by moving.