"What is the 2d10 system you ask? It is intended to replace the 1d20 used commonly in some RPG systems. I think the big advantage of using 2d10 instead of 1d20 is that the roll results in a ‘bell curve’ with most of the results in the center, and fewer at the outliers — in other words it is more unlikely to roll very high or very low. This does create some changes that should be considered by the GM as noted in this blog post."