Editing Armour Class

Jump to navigation Jump to search
Help box
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then publish the changes below to finish undoing the edit.

Latest revision Your text
Line 1: Line 1:
{{guidenote}}
[[Category:Gameplay Mechanics]]
'''Armour Class''' ('''AC''') is a measurement of how difficult a creature is to be hit by an attack. In order to successfully hit a creature, the results of an [[Attack roll|attack roll]] must have a number equal to or greater than the target's Armour Class. AC can be increased by equipping [[Armour|armour]] and [[Shields|shields]], by selecting certain [[Feats|feats]] when leveling up, or utilizing certain [[Spells|spells]].
'''Armour Class''' (or '''AC''') is what protects a creature from being hit by attacks. Increasing your {{ArmourClass}} makes it more difficult for enemies to hit you. AC can be increased by equipping [[Armour]] and [[Shields]] or by selecting certain [[Feats]] when leveling up.
 
* Determining your base Armour Class: <code>10 (Natural Armour Class) + [[Dexterity#Dexterity Modifier Chart|Dexterity Modifier]]</code>
== Formulas ==
** The AC bonus from your Dexterity Modifier may be capped when wearing heavier types of [[Armour]].
The default formula that determines AC is:
* In order to successfully hit an enemy, your [[Attack Roll]] must have a number ''equal to'' or ''greater than'' than the number of the target's Armour Class.
: {{InfoBlob|10 + [[Dexterity|Dexterity modifier]] + armour bonus + shield bonus + other bonuses and penalties}}
{{GameplayNavbox}}
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|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.
 
=== Other formulas ===
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}} or {{SAI|Draconic Resilience}}:
: {{InfoBlob|13 + Dexterity modifier + shield bonus + other bonuses and penalties}}
 
{{SAI|Unarmoured Defence (Barbarian)}}:
: {{InfoBlob|10 + Constitution modifier + Dexterity modifier + shield bonus + other bonuses and penalties}}
 
{{SAI|Unarmoured Defence (Monk)}}:
: {{InfoBlob|10 + Wisdom modifier + Dexterity modifier + other bonuses and penalties}}
 
== 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 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.
 
If the defender's AC was increased to 16 (45% chance to be hit), they would instead survive for an average of 11.1 rounds (an 11% increase in effectiveness).
 
Meanwhile, if the defender has 19 AC (30% chance to be hit), they would survive for an average of 16.66 rounds. If their AC was increased to 20 (25% chance to be hit), they would be able to survive for an average of 20 rounds (a 20% increase in effectiveness).
 
The difference between 25 and 24 is even greater, with a {{em|100%}} increase in effectiveness (50 vs 100 rounds).
 
== Footnotes ==
{{notelist}}
 
{{NavGameplay}}
 
[[Category:Gameplay mechanics]]
Please note that all contributions to Baldur's Gate 3 Wiki are considered to be released under the CC BY-NC-SA license, except when noted otherwise (see BG3Wiki:Copyrights for details). If you do not want your writing to be edited and redistributed at will, do not submit it here. Per our Content Rules, you are promising that you wrote this yourself, or copied it from a public domain or similar free resource. Do not submit copyrighted work without permission!

To edit this page, please answer the question that appears below (more info):

Cancel Editing help (opens in new window)

Templates used on this page:

Retrieved from "https://bg3.wiki/wiki/Armour_Class"