Alternative Clerical Magic

[johndallman]

Originally Posted by Peter Knutsen

But if the world is defined by the absence of non-subtle magic then an error rate of 1%, heck even 0.1%, is unacceptably high.

That's why going with a GURPS Powers-based approach, where everything is decided in advance of actual play, will help to maintain the world 100% as it has been defined.

Normal mortal GMs make mistakes, Peter. And Powers doesn't nail things down as tightly as you claim, although it is more precise than RPM.