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<blockquote data-quote="Illithidbix" data-source="post: 6796568" data-attributes="member: 12283">It does lead to an odd thing that the &quot;value&quot; of +1 ceases to be +5% and varies depending upon what number you want need to roll. I believe it gives the &quot;most percentile&quot; benefit when you need to roll a 10+ or 11+ on the 3d6.Also could lead to very tiresome fights between high AC monsters and players trying to hit each other.If you're rolling D20+4 to hit AC: 20 you hit on 16-20; so 20% chance or an average of one hit in five attacks.If you're rolling 3d6+4 to hit AC: 20 you hit on 16-18: so 4.62% change, so on average less than one hit in twenty attacks.Threat Range Maths! Wheee!The other thing is critical threat ranges (and similar) need adjusting to accommodate the new probabilities.Rolling a D20 has 20 different possibilities, rolling 3d6 leads to 216 different ways the dice can fall. This is useful for corresponding probabilities.<a href="http://www.thedarkfortress.co.uk/tech_reports/3_dice_rolls.htm#.VpMFpxWLS70" target="_blank">http://www.thedarkfortress.co.uk/tech_reports/3_dice_rolls.htm#.VpMFpxWLS70</a>I believe 3d618= 0.46%17-18 = 1.85%16-18 = 4.62%15-18 = 9.25%14-18 = 16.20%13-18 = 25.92%12-18 = 37.50%11-18 = 50%Compared to the rather simpler:20 = 5%19-20 = 10%18-20 = 15%17-20 = 20%16-20 = 25%15-20 = 30%Which actually is a lot better mapping than I first guessed(although 17-20 is awkward)So equivalence:&quot;Natural 20&quot; = &quot;Natural 16-18&quot; &quot;Natural 19-20&quot; = &quot;Natural 15-18&quot; (Long Swords/Short Swords etc)&quot;Natural 18-20&quot; = &quot;Natural 14-18&quot; (Rapiers)&quot;Natural 17-20&quot; = Uh &quot;Natural 14-18 and flip a coin with a natural 13?&quot;&quot;Natural 16-20&quot; = &quot;Natural 13-18&quot;&quot;Natural 15-20&quot; = Again somewhat awkward &quot;Natural 13-18 and flip a coin with a natural 12?&quot;Similarly a &quot;Natural 1&quot; on a D20 has similar probabilities to &quot;Natural 3-5&quot;Apparently Improved Critical/Keen Weapons helpfully get Critical threats into the awkward numbers &quot;A threat range of 20 becomes 19-20, a threat range of 19-20 becomes 17-20, and a threat range of 18-20 becomes 15-20.&quot;</blockquote>

[QUOTE="Illithidbix, post: 6796568, member: 12283"] It does lead to an odd thing that the "value" of +1 ceases to be +5% and varies depending upon what number you want need to roll. I believe it gives the "most percentile" benefit when you need to roll a 10+ or 11+ on the 3d6. Also could lead to very tiresome fights between high AC monsters and players trying to hit each other. If you're rolling D20+4 to hit AC: 20 you hit on 16-20; so 20% chance or an average of one hit in five attacks. If you're rolling 3d6+4 to hit AC: 20 you hit on 16-18: so 4.62% change, so on average less than one hit in twenty attacks. [b]Threat Range Maths! Wheee![/b] The other thing is critical threat ranges (and similar) need adjusting to accommodate the new probabilities. Rolling a D20 has 20 different possibilities, rolling 3d6 leads to 216 different ways the dice can fall. This is useful for corresponding probabilities. [url]http://www.thedarkfortress.co.uk/tech_reports/3_dice_rolls.htm#.VpMFpxWLS70[/url] I believe 3d6 18= 0.46% 17-18 = 1.85% 16-18 = 4.62% 15-18 = 9.25% 14-18 = 16.20% 13-18 = 25.92% 12-18 = 37.50% 11-18 = 50% Compared to the rather simpler: 20 = 5% 19-20 = 10% 18-20 = 15% 17-20 = 20% 16-20 = 25% 15-20 = 30% Which actually is a lot better mapping than I first guessed (although 17-20 is awkward) So equivalence: "Natural 20" = "Natural 16-18" "Natural 19-20" = "Natural 15-18" (Long Swords/Short Swords etc) "Natural 18-20" = "Natural 14-18" (Rapiers) "Natural 17-20" = Uh "Natural 14-18 and flip a coin with a natural 13?" "Natural 16-20" = "Natural 13-18" "Natural 15-20" = Again somewhat awkward "Natural 13-18 and flip a coin with a natural 12?" Similarly a "Natural 1" on a D20 has similar probabilities to "Natural 3-5" Apparently Improved Critical/Keen Weapons helpfully get Critical threats into the awkward numbers "A threat range of 20 becomes 19-20, a threat range of 19-20 becomes 17-20, and a threat range of 18-20 becomes 15-20." [/QUOTE]

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