From the back of the book: The Alien Codex brings you an incredible array of sci-fi and space-themed playable races, iconic heroes, and a mountain of ready-to-play sci-fi NPCs, and that’s just the beginning! If your Pathfinder Roleplaying Game campaign ventures into the dark tapestry of space, soars through gleaming dieselpunk spires, or has to defend a fantastic homeworld from alien invasion by eldritch horrors from beyond the stars, this book is an incredible resource to populate the official Pathfinder setting, a universe of your own design, or a dedicated sci-fi saga like the Legendary Planet Adventure Path or in the Aethera Campaign Setting! In this incredible astro-adventuring accessory you’ll find: Rules for over 50 species and how to use them in a sci-fi campaign, from classics like humans and halflings to aquatic, bestial, and reptilian races, psychic species, animate plants, and mechanical beings, and more. Full writeups on over three dozen fully detailed playable races, including favored class options, racial traits, and more. Over 150 feats, spells, magic items, class features, gear, archetypes, and more rules elements to flesh out these creatures. Over 200 ready-to-play stat blocks and templates from CR 1/4 to 21, from bloodthirsty farmers and okanta pilots to klaven marines, hetzuud void sorcerers, auttaine legion commanders, and ultari techlords! You also get nearly a dozen richly detailed iconic heroes, with vividly developed character histories and backgrounds and multiple versions of stat blocks from low level on up! Half a dozen appendices packed full of high-tech armor and weapons, aetherite rules, languages, creature and rule indices, and more! The Alien Codex is an amazing resource for players and GMs alike, and the PDF version is hyperlinked and bookmarked for your convenience. This volume is incredible artwork and delightful design by some of the best authors in the business, opening up amazing new options for your campaign. Don’t let your Pathfinder Roleplaying Game campaign get lost in space or just be a trek among the stars!