Psi SagA is the far-future science fiction setting that uses Dungeons & Dragon's 5th Edition (2014) rules, with custom backgrounds, classes, species, gear, and more. Custom rules for vehicles and spaceships have been added to allow for ship-to-ship combat, or even character-on-mech violence.

Further rules updates include ways to create communities with their own stats, to gain authority and ties to those communities, and leverage them for a character's own ends.

The game's setting includes twenty-plus 'canonical' species, with a section to create new species randomly, complete with special abilities (or weaknesses) based on their physiology or prevailing cultural tendencies.

Seven core classes with three archetypes each cover the class fantasies of sci-fi storytelling, allowing players to create jedi (a Brawler with the Psi Warrior archetype, wielding a beam sword), psi corps agents (a Telepath, Psi Cop subtype), bounty hunters and smugglers, diplomats and duelists, and starship captains, and on and on.

These classes are backed up with dozens of vehicles and vessels, hundreds of items, and custom rules to manage it all. Despite the layers of rules the core remains compatible with Dungeons & Dragons, allowing Game Masters to bring in new items, monsters, and powers from other sources with no effort at all!

The rulebook is fully-illustrated, including full-color for chapter headings and black-and-white for spot illustrations.