You have the power to call your eidolon one additional time per day.
Prerequisite: Eidolon class feature.
Benefit: Whenever you summon your eidolon, it is more powerful for a brief period of time. You may give it a +2 enhancement bonus to its Strength, Dexterity, or Constitution. This bonus lasts 10 minutes after the summoning ritual is complete.
Advanced Player’s Guide. Copyright 2010, Paizo Publishing, LLC; Author: Jason Bulmahn.