Publisher's blurb: The final volume of the core SciFi20 rules, the Planetary Guide provides you all of the tools to build your custom universe starting with generating a star map, moving on to determining the details of each individual star system, and finally generating the core details of any planet or moon to be found. This volume also includes all the rules needed for generating alien animals specific to your worlds. The books in this series comprise the official SciFi20 (SF20) rules set and are based on the original T20 rules.es.0 (SF20) rules set and are based on the original T20 rules.