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Armor class (AC) is a number representing a creature's ability to avoid being hit in combat. An opponent's attack roll must equal or exceed the target creature's AC to hit it.

AC = 10 + armor bonus + shield bonus + dodge bonus + natural armor bonus + deflection bonus + other bonuses

The average, unarmored peasant has an AC of 10.

AC typesEdit

Only dodge bonuses stack, up to a maximum of +20. For all other types of bonus, the single highest modifier is applied.

A polymorph form may convert some item AC bonuses to separate deflection AC bonuses that do not stack, though the item property haste will still give a +4 dodge bonus if it is included in the merge. All other item AC bonuses it will ignore. The polymorph may also give a dodge bonus and, more rarely, a deflection bonus to AC. All of this AC pertains to the corresponding +20 cap and only the dodge stacks. There also may be a change to the AC from the new size modifier according to the size of the polymorph.

Armor class guideEdit

As above, there are several types of armor class in Neverwinter Nights; some will work together (i.e., stack) and some will not. Knowing what stacks and what doesn't can often mean the difference between useful equipment and useless equipment.

Below are 6 AC categories; the 5 that NWN uses (natural, armor, shield, deflection, dodge), and one extra "other" category to hold the bonuses that do not fit into the 5 base categories. All these categories will stack together, and ultimately sum together to form a character's total AC.

Sources of natural ACEdit

These will not stack with each other; the highest one is used. **

Sources of armor ACEdit

These will not stack with each other; the highest one is used. **

Sources of shield ACEdit

These will not stack with each other; the highest one is used. **

Sources of deflection ACEdit

These will not stack with each other; the highest one is used.

Sources of dodge ACEdit

These will stack with each other, but is limited to a +20 maximum dodge bonus. *

All dodge AC is lost when caught flat-footed (even if the character has the uncanny dodge feat).

Other sources of ACEdit

These are all individual sources, and stack together with no restrictions.


* The dexterity bonus to AC, dodge, and tumble AC benefits are lost when caught flat-footed, but the uncanny dodge and defensive awareness feats allow the dexterity bonus to be retained.

** The armor, shield and natural AC provide no benefit when subject to a touch attack.