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Armor Class (AC)
An individual's AC is a number that represents how well it avoids being wounded from a melee attack, ranged attack, or spell that requires an attack roll. The higher the AC, the better.
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AC measures both toughness (a sword strikes but fails to penetrate your armor) and agility (you dodge the swing of a sword).
You successfully hit your foe if your attack roll, with all modifiers ≥ the foe's AC.
Certain armor limits or prevents application of a Dex. modifier to AC. See the Armor Table.
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Unarmored Defense class feature
AC = 10 + natural armor + made armor + Dexterity modifier + magic items + temporary effects (cover, spells, potions)
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