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| {{Version013}}
| | #REDIRECT[[Armour#Calculating AC Value]] |
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| This page explains how the game calculates and uses [[AC]]. If you're not into math or don't want to be spoiled, stop reading right now.
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| ==Calculating AC from Armour==
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| The formula for calculating the actual AC granted by wearing a piece of armour is as follows:
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| (base AC) * (22 + Armour skill + Racial armour bonus/2) / 22
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| This means that every level in the [[Armour skill]] increases a piece of armour's AC by approximately 4.5% of its base AC. As for racial armour bonuses, they effectively act as bonus levels in the Armour skill. They are as follows:
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| *Dwarven armour grants all species a +4 bonus (roughly +9% to base AC). [[Deep dwarves]] receive an additional +4 for a total of +8 (roughly +18% to base AC).
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| *Elven armour grants elves ([[high elf]], [[deep elf]], or [[sludge elf]]) a +2 bonus (roughly +4.5% base AC).
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| *Orcish armour grants [[Hill Orc]]s a +4 bonus (+9% base AC). If you're a follower of [[Beogh]], you receive an additional bonus, increasing with Piety. This additional bonus maxes out at +9 when you reach 180 Piety, for a total of +13 (roughly +29% to base AC).
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| A hill orc follower of Beogh with max Piety and 27 Armour skill has the AC of all orcish armour pieces increased to roughly 252% of their base value.
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| Note that fractional AC from multiple pieces of armour does add! Fractions are not truncated until the contribution from all armour pieces are summed. For example, both a [[helmet]] and a [[pair of gloves]] have 1 base AC, so at an Armour skill of 12 they each provide 1.55 AC, which is rounded down to 1 AC when worn individually. When worn together, their contributions sum to 3.1 AC, which is rounded down to 3 AC.
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| ==Other Sources of AC==
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| All other sources of AC are applied directly to a character's total AC and are not modified by Armour skill whatsoever. These include:
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| *Bonus AC from [[scroll of enchant armour|enchanted]] armour, [[ring of protection|rings of protection]], or artefacts
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| *Magical AC boosts such as [[Ozocubu's Armour]] or [[Stoneskin]]
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| *AC from transmutations such as [[Necromutation]], [[Statue Form]] and [[Dragon Form]]
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| *AC from mutations (e.g. scales) and intrinsics (e.g. a [[naga]]'s increasingly tougher skin)
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| [[Category:Game mechanics]]
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| [[Category:Defence]]
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