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Message: <blockquote data-quote="Ovinomancer" data-source="post: 8059924" data-attributes="member: 16814">Yes, I used your assumption set, which I think is incorrect, which has the effect of reducing the impact of overkill.  Besides, the point I was making was how to evaluate overkill damage, not that it would reveal a huge discrepancy.  The larger the damage delta is, the more effect it has, though.It's useful for other examples as well.  If we continue to use your assumption on killing blows of 1/4 of attacks are killing blows and combat lasts three rounds, let's look at two fighters, one who takes a +STR ASI and the other who takes GWM.  We'll set the AC for the target at 13 so as to be well within the GWM range.Fighter 1, STR 20, level 5, 2 attacks, dmg(F1) = 2d6+5 = 12, %hit = 80%Fighter 2, STR 18, level 5, 2 attacks, dmg(F2) = 2d6+14 = 21, $hit = 50%The calculated X' for Fighter 1 is 8.93, so per round damage is 17.86.  For Fighter 2, X' is 9.75, for a DPR of 19.5  The DPR difference here, due to overkill using your assumption of frequency, is less than 2.  Since, as you say here, a difference of 1 doesn't really matter, does less than 2 matter?  In other words, using GWM within the determined bandwidths is brought to close to no difference.  If we really want to be precise, we'd add one more attack of damage to Fighter 2 to represent the first bullet of GWM, but that occurs once in 6 attacks, so it's 1/6th of the damage -- that's still +3.5 DPR, though, which really just proves that it's the extra granted attack that makes the difference and not the +10.Interestingly, the DPR delta actually get better for the GWM fighter at higher ACs because they lose less due to overkill.  They also hit less often.  At a hit% of .6/.3, X' delta drops to 0.817.As an update, the OAD calculate should take the rounded down value for X.  This is because X can have fractional values but target hp cannot.  The difference this makes is very small, but improvements are improvements.</blockquote>

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