General | Combat Stamina
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Shield Wall (Combat, Teamwork)

Source Advanced Player's Guide pg. 169
You form a unified defense with those around you.

Prerequisites: Shield Proficiency.

Benefit: Whenever you are wielding a shield and are adjacent to an ally wielding a shield who also has this feat, the AC bonus from your shield increases, depending on the shield wielded by your ally. If your ally is wielding a buckler or a light shield, your shield bonus increases by +1. If your ally is wielding a heavy shield or a tower shield, your shield bonus increases by +2. You keep these bonuses even if your ally loses his shield bonus due to making a shield bash attack. If an adjacent ally with this feat uses a tower shield to grant total cover, you also benefit if an attack targeting you passes through the edge of the shield (Core Rulebook 153).

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 131
You can spend 2 stamina points to increase the bonus you grant to your ally with this feat by 1 until the end of your next turn.