From publisher blurb: Cosmic Characters and Amazing Aliens The Alien Codex brings you an incredible array of playable races, iconic heroes, and a mountain of ready-to-play sci-fi NPCs for your Starfinder Roleplaying Game campaign! Whether playing in the official setting or a 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 Starfinder 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 unique racial abilities, class options, gear, and more. . Over 100 feats, spells, magic items, class features, gear, archetypes, and more rules elements to flesh out these creatures. Over 150 ready-to-play stat blocks and templates from CR 1/2 to 20+, from convoy drivers 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, alien viruses, aetherite rules, languages, creature and rule indices, and more!