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Message: <blockquote data-quote="howandwhy99" data-source="post: 6095289" data-attributes="member: 3192">Alternatively, you could require a second d20 roll for creatures that can't miss or can't hit, so their dice roll options are never irrelevant. I've been puzzling out how much of the game uses linear expressions and other times parabolic curvilinear ones. The result of a 2 being 100% better than a 1, but the result of a 19 instead of an 18 is only slightly more than 5 1/2%. AC bonuses still can miss and AC penalties can still hit. Just extend out the progression of results by halving for the second roll. 50%=10, 75%=15, 87.5%=18, 93.75%=19, and 96.875=20 to hit target numbers adjusted above 20. This matches well with the +5 limit on magic item bonus too.</blockquote>