I had an issue. An issue with dice. A dice issue, if you will. I knew what I wanted, but I was unsure on how to do it. Then I was on walkabout for a bit and was struck with a fairly simple idea. I hope it will work.
I have two kinds of dice Light dice and Dark dice(formerly white and black dice, I will probably rename them as I go along). I new that I wanted there to be a mechanical and thematic difference between teh two kinds of dice, but I was uncertain how to implement that. Here is the solution I have.
Your Light dice are for the target number. They are always additive. If you roll two Light dice you would add them together and come up with a positive number. Your Dark dice are how well you do at something. These dice are always subtractive. If you have all Light dice and no Dark dice you succeed at a cost. If you have all Dark dice you might not succeed at all, but if you do you effect will be more/bigger/greater. The goal is to have enough Light dice to succeed(positive numbers) and enough Dark dice to have the effect you want without damaging your chances at success.
So what do you think? You think it will work? i am interested in your thoughts on the matter.