Taboo Systems

An idea just came to me. Instead of you stating what you can do (by alloating points to abilities/characteristics) you define what you cannot do in conjuction.

Example: Anyone can use magic, but only if they don't eat any meat that day. Anyone can sustain more damage and reist pain, but only if they have eaten meat that day.
This gives us a "Internal Logic" as to why you can do some things but not others.

Another idea to contemplate.