Previously released as six seperate species sourcebooks, The Ephemeris Species Compendium combines all of the material from those sourcebooks into one title. You'll find more information on what makes each of the species tick, including new species specific sub-classes, new skills and abilities, and new goods for your character to use. This supplement contains the following sourcebooks: The Althani Sourcebook, The Arbonix Sourcebook, The Culthan Sourcebook, The Human Sourcebook, The Melanathee Sourcebook, and the Tulmath Sourcebook.