A Foundry VTT v14 module for writing the rules of any tabletop RPG and playing them in any world, whatever game system is installed.

Rule Them'All is a powerful and flexible rule creation module for Foundry Virtual Tabletop.

It allows Game Masters and system creators to design, configure, and manage virtually any type of game rule, from simple mechanics to complex rule systems, without being limited to a predefined ruleset.

Rule Them'All can extend existing Foundry VTT game systems with custom rules and mechanics, or serve as a complete rule-building framework for the Systemless game system.

Whether you want to customize an existing RPG system or build your own rules from scratch, Rule Them'All gives you the freedom to create and shape your gameplay experience.