JohnSnow
Hero
Creating a system to track “all possible creatures in the universe” is, imo, unwise.I get that, but I see the fact that many monsters should exist above or below that scale (or both) as a real flaw.
1 to 30 is just too small a range to encompass all possible creatures in the universe.
It would be unwieldy in game, and would play terribly. The simple fact is that while Batman (for example) can credibly battle opponents a certain degree faster, stronger, and tougher than he is, is, he is, realistically, a (physical) non-threat in Superman’s world. And yes, that’s true of Lex Luthor too.
One could determine what the reasonable upper max is that a “peak human” could actually fight against. That’s your upper score.
Past that, you’re on a different level entirely, and any comparison one makes is about like rating the strength score of a mouse against that of a human.