Armour Class: Difference between revisions
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The AC bonus from Dexterity modifier may be capped when wearing [[Armour#Medium armour|medium]] and is ignored entirely when wearing [[Armour#Heavy armour|heavy]] armour. | The AC bonus from Dexterity modifier may be capped when wearing [[Armour#Medium armour|medium]] and is ignored entirely when wearing [[Armour#Heavy armour|heavy]] armour. | ||
Medium armour caps the Dexterity Modifier to +2,{{note|The [[Medium Armour Master]] feat increases the cap from +2 to +3.}}{{note| | Medium armour caps the Dexterity Modifier to +2,{{note|The [[Medium Armour Master]] feat increases the cap from +2 to +3.}}{{note|Four rare armours have an "Exotic Material" trait that allow the wearer to get the full Dexterity bonus to AC, namely [[Yuan-Ti Scale Mail]], [[Unwanted Masterwork Scalemail]], [[Sharpened Snare Cuirass]], and [[Armour of Agility]].}} whereas heavy armour ignores the modifier entirely. | ||
Shields will grant the listed AC bonus to whomever equips it, regardless of which weapon slot they are currently using. | Shields will grant the listed AC bonus to whomever equips it, regardless of which weapon slot they are currently using. | ||
=== Other formulas === | === Other formulas === | ||
Unarmoured creatures may use | Unarmoured creatures may use one of the following different formulas if they have certain features. Creatures always use whichever formula – which they have access to – would result in a higher AC.{{note|Alternative formulas are only used if {{em|no}} items are worn in the chest, hands, helm or boots slots which are labelled as armour.|name=slots}} | ||
{{SAI|Mage Armour}} | {{SAI|Mage Armour}} or {{SAI|Draconic Resilience}}: | ||
: {{InfoBlob|13 + Dexterity modifier + shield bonus + other bonuses and penalties}} | : {{InfoBlob|13 + Dexterity modifier + shield bonus + other bonuses and penalties}} | ||
{{SAI|Unarmoured Defence (Barbarian)}}: | {{SAI|Unarmoured Defence (Barbarian)}}: | ||
: {{InfoBlob|10 + Constitution | : {{InfoBlob|10 + Constitution modifier + Dexterity modifier + shield bonus + other bonuses and penalties}} | ||
{{SAI|Unarmoured Defence (Monk)}}: | {{SAI|Unarmoured Defence (Monk)}}: | ||
: {{InfoBlob|10 + Wisdom | : {{InfoBlob|10 + Wisdom modifier + Dexterity modifier + other bonuses and penalties}} | ||
== Mathematics== | == Mathematics== | ||
Armour Class becomes more useful the greater it is – the difference in effectiveness between 20 and 19 AC is {{em|greater}} than the difference in effectiveness between 15 | Armour Class becomes more useful the greater it is – the difference in effectiveness between 20 and 19 AC is {{em|greater}} than the difference in effectiveness between 16 and 15. | ||
To illustrate this, if a defender has 15 AC and 10 HP, and the attacker has +5 (50% chance to hit) to attack rolls, and deals 2 damage per attack, the defender would on average survive for 10 turns. | To illustrate this, if a defender has 15 AC and 10 HP, and the attacker has +5 (50% chance to hit) to attack rolls, and deals 2 damage per attack, the defender would on average survive for 10 turns. | ||