Improved Back to Back
System: Pathfinder | SRD
Types: Teamwork
After much practice, you and an ally have become adept at fighting in close proximity to one another.
Prerequisites
Back to Back, Perception 5 ranks.
Benefits
While you are adjacent to an ally who is flanked and also has this feat, you can spend a swift action to gain a +2 bonus to AC against all flankers until the start of your next turn.
Source: Ultimate Combat
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