Just make it up in a way that makes sense. Capture the spirit of the rules.

But this is coming from a guy who ran an entire Buffy campaign, diceless, used a modified version of the Amber ruleset.

Well, that is what the players thought. 2 years later I explained to them that their character sheets and all that experience they had spent was only ever a reflection of how good their characters thought they were. There were no rules.

Only the amazing tarot deck from a game I can’t remember any more.

Great times. Looking back on it now it was far more supernatural way before its time. I think I ran this in 1998.