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this gets into some fun D and D math so
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it if you're scared of math bear with me
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i promise this will be educational so
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the fundamental math of fifth edition Dn
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D assumes that a character who is good
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at something will succeed 65% of the
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time you're going to succeed on an eight
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so at level one you'll typically have a
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plus three ability modifier in your
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primary ability a plus two proficiency
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bonus add that together you get plus
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five so 8 + 5 is 13 so the expected AC
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for a monster at level one is 13 so that
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progression stays on track through the
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entire level range the armor classes for
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a monster of your level increase at the
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times when you're expected to increase
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your ability modifier and when you're
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expected to increase your proficiency
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bonus so the expectation is always that
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you will hit a typical CR appropriate
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monster on an eight assuming you're
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staying on the fundamental math
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progression now you might fall behind
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that fundamental math if you're taking
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feats or something especially in the
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2014 rules where a lot of feats didn't
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include an ability score increase with
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that 65% assumption we can use that to
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calculate your expected damage per round
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or DPR so essentially just calculate
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your average damage multiply it by 0.65
