I'm sorry if this has already been posted but it's obscure enough I'm not sure a search would have produced the answer. Long story short: I'm running D&D 5e but I want to use 2d10 as the die mechanic instead of 1d20. The reasoning is that I'd like to have a bit more emphasis on character skill and less crit/fumble odds as you can see when you plot the difference at anydice . I'm wondering if someone can create an API that calculates crits and fumbles based on die roll totals instead of individual die results. Since I'm thinking weapon break on a fumble (snake eyes; 1 & 1) and Lingering Effect (as per the DMG rules) on a crit (10 and 10), I'm fine with a 1% chance (2 or 20 on 2d10). As a further request, maybe allowing an optional mechanic for barbarians, champion fighters, and/or half-orcs who benefit from crits to have higher odds than the default. I have enough programming knowledge to decipher attributes, just not entire programs. :( Thanks to anyone willing to help out the programming illiterate!