General | Combat Stamina
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Improved Trip (Combat)

Source PRPG Core Rulebook pg. 128
You are skilled at sending your opponents to the ground.

Prerequisites: Int 13, Combat Expertise.

Benefit: You do not provoke an attack of opportunity when performing a trip combat maneuver. In addition, you receive a +2 bonus on checks made to trip a foe. You also receive a +2 bonus to your Combat Maneuver Defense whenever an opponent tries to trip you.

Normal: You provoke an attack of opportunity when performing a trip combat maneuver.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 124
You can select this feat even if you don’t meet the ability score prerequisite (Intelligence 13). You gain the benefits of this feat only as long as you have at least 1 stamina point in your stamina pool. When you are the target of a trip combat maneuver, you can spend a number of stamina points up to your Strength or Dexterity bonus, whichever is greater. Your CMD against that trip attempt increases by that number.

Mythic Improved Trip

Source Mythic Adventures pg. 68
You’re expert at knocking your foes down.

Prerequisites: Improved Trip.

Benefit: You gain a bonus equal to half your tier on checks to trip, and to your CMD when an opponent tries to trip you. These bonuses stack with those granted by Improved Trip.

Furthermore, you can make an attack of opportunity against any creature that attempts to trip you, unless it also has this feat.