From the introduction: This document contains a broad selection of challenges to use in your Pathfinder Playtest games, including all the adversaries from the playtest adventure, Pathfinder Playtest: Doomsday Dawn. If you’re adapting other adventures to playtest even further or creating your own adventures, you’ll find a broad selection of hazards and creatures here, along with guidelines for building encounters with them. Because this document is meant to be used in the playtest and won’t appear in a print edition, it contains less art and information than a standard bestiary and has a different layout.