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Message: <blockquote data-quote="Coredump" data-source="post: 1404795" data-attributes="member: 6939">We should make this topic a sticky......MOST ROLLS ARE BINARY!!!You either succeed or you fail.  (criticals aside) If you need a 10 to hit, it makes NO DIFFERENCE if you roll a 10, or a 13, or a 17.  Nor if you roll a 9 or a 7 or a 2.  It is a yes or no answer.you are not rolling a D20, you are rolling a simplified percentile roll. You have a 55% chance of hitting (10-20) and a 45% chance of missing (1-9). That is all.  If you switch to 2d10 or 3d6, you have gone from a 20 sided percentile roll, to a  100 sided (or 216 sided) percentile roll. But it is *still* a percentile roll. Now, you have two choices, you can make the percentage the same by changing the DC needed in order to keep the 55-45 chance, or you can change the game by keeping the DC and changing the likelihood of hitting.The ONLY time using a bell curve would matter is when the die result can have multiple outcomes. Lets say that you are crafting something, and want to determine its worth. Then rolling 3d6 might be better than 1d20.Almost ALL rolls in DnD are percentages, these are easiliy represented via d100, or d20 or d10 or whatever. To represent the same percentages via 2d10 or 3d6 takes a lot of math knowledge, for no benefit.</blockquote>