Your eidolon excels at a movement type you do not possess.
Benefit: Your eidolon receives a +5-foot enhancement bonus to one type of speed it has that you do not, such as a climb or swim speed. If your eidolon doesn’t already possess such a mode of movement, you may apply this trait bonus later if it gains an evolution that grants it such a mode. Once this bonus is applied to a mode of movement, it can’t be switched to another mode.
Pathfinder Roleplaying Game: Ultimate Campaign. © 2013, Paizo Publishing, LLC; Authors: Jesse Benner, Benjamin Bruck, Jason Bulmahn, Ryan Costello, Adam Daigle, Matt Goetz, Tim Hitchcock, James Jacobs, Ryan Macklin, Colin McComb, Jason Nelson, Richard Pett, Stephen Radney-MacFarland, Patrick Renie, Sean K Reynolds, F. Wesley Schneider, James L. Sutter, Russ Taylor, and Stephen Townshend.