- Get your system's id (
game.system.id
). - Go to the module/EstimationProvider.js file.
- Create your own subclass of EstimationProvider to the list. It needs to be named exactly as your system. If your system's name has invalid characters (e.g.
name-with-hyphens
), then you'll need to set its name in theproviderKeys
constant at the top of the file. - Follow the instructions in the EstimationProvider class. Check out some other subclasses, like PF2e, SWADE, etc.
- The minimum needed is a fraction function, everything else is optional.