Armour class

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Version 0.30: This article is up to date for the latest stable release of Dungeon Crawl Stone Soup.

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

The most common way to improve your AC is by wearing armour. Heavier and higher-AC body armour (and body armour alone) comes at the cost of encumbrance, which reduces EV, spell success rates, and stealth. Other pieces of gear, especially artefacts, may also increase your AC, and magical spells may temporarily boost it. For details on how your AC score is calculated, see AC calculations.

AC damage reduction

AC reduces the damage of attacks 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 armour in other games, like spell magic.

BEAM_ELEC damage (such as from Shock or Lightning Bolt) ignores half of the target's AC. BEAM_FRAG damage (such as from Sandblast or a tin of tremorstones) is affected three times as much by AC.

Guaranteed Damage Reduction

Main Article: GDR

When taking physical damage from a melee attack, guaranteed damage reduction will improve AC rolls. 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. GDR only applies to melee attacks.

List of Damage that ignores AC