This new rules supplement provides everything players and gamemasters need to participate in adventures in the time period between the Renaissance and World War II, including new character options and rules for early modern firearms. It begins with an exploration of the historical period between 1450 and 1950, then provides rules for creating characters and campaigns that blend realism and fantasy. d20 Past also presents alternative campaign models, along with all the rules needed to play swashbuckling pirate adventures, Victorian horror investigations, thrilling Pulp Era escapades, and more, including three ready-to-play campaign modules.