You’ve learned to summon a wider array of creatures.
Benefit(s): When you summon one or more animals, humanoids, or vermin using a summon nature’s ally spell (or an effect that mimics such a spell), instead of granting them the benefit from Augment Summoning, you can instead apply one of the following templates to them: aerial, aqueous, chthonic, fiery, or primordial. If you summon multiple creatures with one casting, they must all have the same template.
Pathfinder Player Companion: Monster Summoner’s Handbook © 2015, Paizo Inc.; Authors: Alexander Augunas, Tyler Beck, Anthony Li, Luis Loza, David N. Ross, Owen K.C. Stephens, and Linda Zayas-Palmer.