A question re-posted in brief from my blog.
What if a Magic Research throw could indicate a degree of success that might reduce the time and gold required to accomplish a task such as replacing a spell in an arcane repertoire?
I suspect some easily adapted d20 degree of success mechanics are out there. What do you recommend?
How about the magical experimentation breakthrough rules in Players’ companion?
I think that’s already the framework you’re looking for. It helps add system verisimilitude, as well.
Exceed by 5+, 10+, or 20+. Also gives you minimum levels of 5th, 9th, and 11th.
Maybe just make it 10%, 20%, and 30% less time and gold? or 5/10/15% - which is what I’d likely do.