Armor penetration

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.

Armor penetration only lowers the BaseAL of the opponent's armor. It does not affect any additional AL added by equipment bonuses or skills.

consider an example situation: an elementalist with uses Lightning Strike against a warrior wearing gladiators armor. Lightning strike has has 25% armor penetration. the warrior has 80 Base AL with no bonus for elemental damage, which results in an effective 60 AL (80 * (1 - 0.25)). at 80 AL attack would have caused 20 damage, but armor penetration will increase the damage to 281. Note: this is roughly a 40% increase.

There are two types of armor penetration: base armor penetration and bonus armor penetration:
 * Base armor penetration is a set armor penetration value, and is usually listed in game with text such as "This attack has 20% armor penetration." Base armor penetration does not stack, and only the largest value is used for any single attack. Sources include:
 * the Strength attribute, Penetrating Attack and Penetrating Blow
 * Horn Bow-type bows, Penetrating Attack and Sundering Attack
 * Many Air Magic spells.
 * Bonus armor penetration is an additional armor penetration value, and is usually listed in game with text such as "Armor penetration +20%." Bonus AP does stack with Base AP, and other sources of Bonus AP. Sources include:
 * [[Image:Sword_Hilt.png|18px]]Sundering weapon upgrades
 * Primal Rage
 * Judge's Insight.

Related Articles
1 see Damage for additional information on damage calculations.