Your bond with your eidolon helps to focus your concentration.
Prerequisites: Shield ally class feature.
Benefit: While you are adjacent to your eidolon, you receive a +4 bonus on concentration checks.
Pathfinder Roleplaying Game: Ultimate Magic. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.