General | Combat Stamina
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Covering Defense (Combat)

Source Advanced Player's Guide pg. 156
You are skilled at protecting yourself and your allies with your shield.

Prerequisites: Shield Focus, base attack bonus +6.

Benefit: When you use the total defense action while using a light, heavy, or tower shield, you can provide a cover bonus to AC against all attacks to an adjacent ally your size or smaller. This cover bonus is equal to your shield’s shield bonus and lasts until the beginning of your next turn. Your shield does not provide a cover bonus to Reflex saves.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 116
When using the total defense action, you can spend 5 stamina points. If you do, your shield also provides a cover bonus on your ally’s Reflex saves.