General | Combat Stamina
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Saving Shield (Combat)

Source Advanced Player's Guide pg. 168
You deflect attacks that could mean your ally’s death.

Prerequisites: Shield Proficiency.

Benefit: Whenever an adjacent ally is the target of an attack, you can, as an immediate action, grant that adjacent ally a +2 shield bonus to AC. You must be wielding a light shield, heavy shield, or tower shield to use this feat.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 130
When you use this feat, you can spend 2 stamina points to increase the shield bonus granted to your ally by an amount equal to the enhancement bonus of the shield you are using.

Mythic Saving Shield

Source Mythic Adventures pg. 72
Shielding a comrade from harm gives you a chance to strike back.

Prerequisites: Saving ShieldAPG.

Benefit: The shield bonus you grant an ally with Saving Shield increases to +3. If you use Saving Shield to successfully negate an attack against an adjacent ally, you can immediately make an attack of opportunity against the attacker so long as it is within your melee reach.