Fateforge - 5e Game System
 

Let's say that I'm playing in a new game for Fateforge (just released by Studio Agate). It's based on the 5e rule system, but pretty much everything is up for grabs. It uses the same ability scores and skills, but species (races), feats, spells, etc is different. Also there's the occasionally new thing that needs to be tracked like corruption level or madness.

What would be the best way to go about it? Create a new game system from scratch? Create a new source and uncheck everything but that source? I'd really dislike having to do every single thing from scratch, but if that's the best way, it's the best way...

I would not advise creating a new game system from scratch. But yeah, you could be up for a lot of work. Of course, if you never plan on releasing this, you really only have to build what you use, and you shouldn't have to do some of the fancy coding for elements interacting.

If its already based on 5e D&D then I'd start with that. It is much easier to add, change and hide existing stuff, than completely recreate the system.

I'm delighted someone's looking at this, though I lack the skills necessary to contribute. Recently backed this in Kickstarter, with print delivery estimated early 2021. Very excited: Thank you for your hard work.