General | Combat Stamina
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Improved Sunder (Combat)

Source PRPG Core Rulebook pg. 128
You are skilled at damaging your foes' weapons and armor.

Prerequisites: Str 13, Power Attack, base attack bonus +1.

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

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

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 124
When you are the target of a sunder combat maneuver, you can spend a number of stamina points up to your Strength or Dexterity bonus, whichever is greater. Your CMD increases by that number for that sunder attempt.

Mythic Improved Sunder

Source Mythic Adventures pg. 67
Your mighty smashing blows demolish objects.

Prerequisites: Improved Sunder.

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

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