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Message: <blockquote data-quote="NotAYakk" data-source="post: 8184231" data-attributes="member: 72555">Attacks on you have a DC.You roll your AC (or whatever) against it to defend.---An AC of 17 becomes an Armor Save of +7.A +7 attack doing 2d12+5 damage becomes a DC 18 attack doing 2d12+5 damage.The attacked player "rolls armor save" against DC 19.  On a natural 1 they are critical hit.Before, the attack had a 55% chance of hitting (10+ on d20).  After, the attack has a 55% chance of hitting (Avoid it on a 12+ on a d20).Attack DCs are 12+your attack modifiers.  Yes, this is higher than save DCs of 8+your modifiers; someone with 10 in an attribute and no proficiency has the mathematical equivalent of 14 "AC" in that save.--You can change the math so that Attack DCs use the same math as Spell DCs.That just means your Armor Save is 4 points lower; ie, it is AC-14.  Attack DCs are 8+attack modifier, not 12+attack modifier.This has the advantage that a monster's DCs tend to be a bit more level; the attack DC for a bruiser will match the save DC for the push-back after the hit more often.So a 20 dex rogue in studded leather (AC 17) has an Armor Save of +3.---You can also flip saves around for PC spells.  They roll a spell attack against an attribute defence.A +4 Strength Save becomes a 14+4=18 "Strength Defence".The player rolls 1d20+spell attack to see if they beat the target's "Strength Defence".This is basically how 4e flipped saves for NAD (non-AC defences).</blockquote>

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