Principia Canonica

Principia Canonica is a narrative tabletop roleplaying line structured around creative collaboration and character-driven action. Play starts with an unstable situation, where character decisions carry weight and outcomes reshape what happens next. The system uses flexible traits and a pressure-based resolution method to keep focus on the fiction. Each book is a tool for the table, designed to help you produce a unique story through play.

The core book contains all the rules, with plentiful examples to guide you. It is designed to be as universal as possible. The focus is on storytelling, not on the mechanics of genre tropes. This approach helps to keep play engaging and avoids getting bogged down with too many specific rules and variations.

Story bibles provide everything you need to launch a storyline in a specific setting or genre, including situations, factions, ready-to-play characters, and other advice. Each stands alone, but is designed to allow gamemasters to mix and match to create their own unique scenarios. The Principia Canonica is required to play the story bibles.