Difference between revisions of "Armour class"

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When something injures you, your '''Armour class''' (often abbreviated to '''AC''') reduces the amount of damage you suffer. The most common way to improve your AC is by wearing body [[armour]], gloves, boots, cloaks, and head gear. Other pieces of gear, especially [[artefact]]s, may also increase your AC, and magical spells may temporarily boost it too. While heavier armour provides superior protection, it also reduces your [[Evasion]], hinders spellcasting, and causes you to occasionally miss attacks unless you have sufficient [[Armour (skill)|Armour skill]] to offset its penalties.
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When something injures you, your '''Armour class''' (often abbreviated to '''AC''') reduces the amount of damage you suffer.  
  
Armour can be enchanted with [[scroll of enchant armour|scrolls of enchant armour]] to grant bonus AC.
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The most common way to improve your AC is by wearing [[armour]]: body [[armour]], gloves, boots, cloaks, and head gear. Other pieces of gear, especially [[artefact]]s, may also increase your AC, and magical spells may temporarily boost it. Heavier body armour (and only body armour) also comes at the cost of [[EV]] and spellcasting, though [[Armour (skill)|Armour skill]] can offset its penalties.
  
 
==AC damage reduction==
 
==AC damage reduction==
In general AC reduces the damage of attacks susceptible to AC by an absolute value between 0 and your current AC value: in other words, an AC of 10 will reduce damage by a random number between 0 and 10. However, this is not always precisely true: against melee attacks, body armour can provide [[guaranteed damage reduction]] based its base AC, and some attacks (such as [[constriction]]) can partially bypass AC. See the [[AC calculations]] page for more details.
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In general AC reduces the damage of attacks susceptible to AC by an absolute value between 0 and your current AC value. an AC of 10 will reduce damage by a random number between 0 and 10. This applies to damage that would traditionally ignore defense in other games, such as most [[spell]] magic and elemental attacks. However, this is not always precisely true. See the [[AC calculations]] page for more details.
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===Guaranteed Damage Reduction===
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''Main Article: [[GDR]]''
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When taking physical damage in melee, guaranteed damage reduction will reduce damage. GDR% is equal to <code>16*(AC)^1/4</code>. If GDR is applied, the minimum possible AC roll will equal (damage*GDR%) or (AC/2), whichever is lower.
  
 
==List of attacks or sources of damage which are not reduced by AC==
 
==List of attacks or sources of damage which are not reduced by AC==
*Special damage caused by weapon [[brand]]s, [[attack flavour]]s and [[magical staves]] (except the [[staff of earth]]).
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*[[Torment]] and [[Holy Word]]
*The [[poison]] and sticky flame status effects.
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*[[Smite]] and [[Damnation]]
*The following spells ignore AC: [[Freeze]], [[Pain]], [[Vampiric Draining]], [[Static Discharge]], [[Sticky flame]], [[Agony]], and [[Ozocubu's Refrigeration]].
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*The [[poison]] and [[sticky flame]] status effects.
*The following monster spells, abilities, or scrolls: [[Torment]], [[Holy Word]], [[Smite]], [[Hellfire]] and the chilling blast [[draconian breath attack|breath attack]] of a [[Draconian_(monster)|white draconian]].
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*Extra damage caused by weapon [[brand]]s, [[attack flavour]]s and [[magical staves]] (except the [[staff of earth]]).
 
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*The following spells: [[Freeze]], [[Pain]], [[Vampiric Draining]], [[Static Discharge]], [[Frozen Rampart]]s, [[Ozocubu's Refrigeration]].
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*The chilling blast [[draconian breath attack|breath attack]] of a [[Draconian_(monster)|white draconian]].
  
 
[[Category:Stats]] [[Category:Game mechanics]][[Category:Defence]]
 
[[Category:Stats]] [[Category:Game mechanics]][[Category:Defence]]

Revision as of 10:49, 2 August 2022

Version 0.28: This article may not be up to date for the latest stable release of Crawl.

When something injures you, your Armour class (often abbreviated to AC) reduces the amount of damage you suffer.

The most common way to improve your AC is by wearing armour: body armour, gloves, boots, cloaks, and head gear. Other pieces of gear, especially artefacts, may also increase your AC, and magical spells may temporarily boost it. Heavier body armour (and only body armour) also comes at the cost of EV and spellcasting, though Armour skill can offset its penalties.

AC damage reduction

In general AC reduces the damage of attacks susceptible to AC by an absolute value between 0 and your current AC value. an AC of 10 will reduce damage by a random number between 0 and 10. This applies to damage that would traditionally ignore defense in other games, such as most spell magic and elemental attacks. However, this is not always precisely true. See the AC calculations page for more details.

Guaranteed Damage Reduction

Main Article: GDR

When taking physical damage in melee, guaranteed damage reduction will reduce damage. GDR% is equal to 16*(AC)^1/4. If GDR is applied, the minimum possible AC roll will equal (damage*GDR%) or (AC/2), whichever is lower.

List of attacks or sources of damage which are not reduced by AC