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DISCLAIMER: The information in this article is based on experimental research conducted by the community, and may contain inaccuracies and speculation. While we strive for accuracy in these articles, we make no claims of experimental rigor or unbiased conclusions. Caveat lector.

Armor penetration, often abbreviated as AP, refers to the amount of an opponent's armor that is ignored when calculating damage from a single damage-dealing attack or skill.

Consider the following situation: a level 20 elementalist with 15 air magic uses Lightning Strike against a warrior wearing Gladiator's Armor (and not wielding a shield). Lightning strike has 25% armor penetration and the warrior has 80 AL versus elemental damage, which results in an effective 60 AL (80 * (1 - 0.25)). Against an effective 80 AL, lightning strike would have dealt 35 damage, but armor penetration will increase the damage to 501. This is roughly a 43% increase.

There are two sources of armor penetration, base armor penetration and bonus armor penetration:

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1 see Damage for additional information on damage calculations.