13th Age is a tabletop role-playing game that combines traditional fantasy elements with innovative mechanics. Designed by Rob Heinsoo and Jonathan Tweet, it emphasizes storytelling and character-driven gameplay, allowing players to create unique characters with personal backgrounds and goals. The game uses a streamlined version of the d20 system, focusing on collaborative world-building between players and the Game Master. Players can choose from various classes and races, and the game features a flexible combat system that encourages creativity and improvisation, making each session dynamic and engaging.