League of Legends Armor Penetration
Armor Penetration, Armor Reduction & Lethality
Armor Penetration, Armor Reduction and Lethality are the statistics of a Champion which allows them to counter some or all of a target's armor. All champions have 0 base armor penetration but can increase it with items, runes, or abilities for a few champions.
Armor penetration and armor reduction are applied in the following order:
2. Percentage armor reduction
3. Percentage armor penetration
Lethality grants a flat amount of armor penetration based on the user's level. The amount of flat armor penetration granted by your current lethality stat is calculated using the following formula:
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