From the publisher's website
Unleash a world of monsters! Bestiary 3 presents hundreds of new creatures for use in the Pathfinder Roleplaying Game. Within this collection of creatures you’ll find grave knights and savage cyclopes, kappa and colossal kaiju, clockwork killers, mysterious sphinxes, imperial dragons, and so much more! Yet not all these monsters need to be foes, as fleet-footed sleipnirs, cunning vanaras, whimsical faerie dragons and more companions from myth and modern fantasy join heroes on the path to legend. In addition, new rules for customizing and advancing monsters and an expanded glossary of creature abilities ensure that you’ll be prepared to challenge your players wherever adventure takes them!
The Pathfinder RPG Bestiary 3 is the latest indispensable volume of monsters for use with the Pathfinder Roleplaying Game and serves as a companion to the Pathfinder RPG Core Rulebook and Pathfinder RPG Bestiary.
The 320-page Pathfinder RPG Bestiary 3 includes:
-More than 300 different monsters
-New creatures drawn from the best-known beasts of legend, literature, and Pathfinder RPG adventures
-Challenges for any adventure and every level of play
-Hordes of new templates and variants, including simple templates for on-the-fly creature customization
-Numerous lists of monsters to aid in navigation, including lists by Challenge Rating, monster type, and habitat
-Expanded universal monster rules to simplify special attacks, defenses, and qualities
-New familiars, animal companions, and other allies
...and MUCH, MUCH MORE!