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Message: <blockquote data-quote="Mustrum_Ridcully" data-source="post: 3770182" data-attributes="member: 710">I think it was in fact in another blog post or similar article in which they described a few features of the "sweet spot": Basically, AC/DCs and attack rolls / saving throw modifiers and skill modifiers are within a reasonable range of the d20.Monsters hit a bit less than 50 %, characters hit a bit more than 50 %. That's the point where the math works well.Beyond that, the variance between the numbers is often to high. Many monsters automatically hit with their first attack. Some monsters are always hit with the first attack of a fighter, some barely. if they hit probabilities are low or high across the board, this might not affect the balance, but it affects the gameplay a lot. If they are very high, it's easy to "accidently" have one-round kills against the players, and in general it easily can turn into a initiative "war".If the the attack chances are to low, the whole game becomes more dependent on lucky rolls, and fights are dragged out without any real benefit, because no tactical variation will affect the outcome much. This can also lead to spellcasters expending either more spells in that encounter, or having to hold back longer (since there are more rounds in which they can or could cast spells, and if defenses are generally to high, the chances of the spells being effective are lower)</blockquote>