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League of Legends Armor Penetration

How does Armor Penetration/Reduction Work?

Armor Penetration and Armor Reduction 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:

1. Percentage Armor Reduction ( Jarvan IV's Dragon Strike)
2. Flat Armor Reduction ( Nasus's Spirit Fire)
3. Flat Armor Penetration ( Greater Quintessence of armor penetration)
4. Percentage Armor Penetration ( Last Whisper)

Items with Armor Penetration/Reduction

Total Price: 2300
Recipe Price: 1065
// 40 Attack Damage. UNIQUE Passive: +35% Armor Penetration

Total Price: 1337
Recipe Price: 617
// 25 Attack Damage. UNIQUE Passive: Reduces ability cooldowns by 10% and +10 Armor Penetration.

Total Price: 2700
Recipe Price: 563
// 30 Attack Damage, 15 Critical Strike Chance. UNIQUE Passive: 10% Cooldown Reduction and +20 Armor Penetration. UNIQUE Active: Gives 20% movement speed and +40% attack speed for 4 seconds. Attacking enemies with melee attacks increases the duration by 2 seconds to a maximum of 8 seconds. (60 second cooldown)

Total Price: 3000
Recipe Price: 1263
// 200 health, 50 Attack Damage, 10% Cooldown Reduction UNIQUE Passive: 10 armor penetration UNIQUE Passive: Dealing physical damage to an enemy champion reduces their armor by 5% for 4 seconds. This effect stacks up to 5 times.

Last Whisper vs The Black Cleaver

Last Whisper 2300 Gold = 40 Attack Damage + 35% Armor Penetration
The Black Cleaver 3000 Gold = 200 health + 50 Attack Damage + 10 Armor Penetration + 5% * 5 Armor Reduction

Advised Purchasing:
0-40 armour = Youmuu's Ghostblade
40-100 armour = The Black Cleaver
100 armour+ = Last Whisper

*Note, this does not include masteries, runes, or champion abilities.

Some Abilities with Armor Penetration/Reduction

Corki's Gatling Gun fires multiple shots every half second dealing a fifth of his total damage, and shredding the armor of enemies who are under continuous fire.

Nasus unleashes a delayed spirit flame at a location, dealing damage and reducing the armor of enemies who stand on it by 20/25/30/35/40.

Wukong's next attack will deal additional physical damage and will reduce the enemy's armor by 10/15/20/25/30% for 3 seconds.

Masteries with Armor Penetration/Reduction

+8% Armor Penetration.

+2 / 3,5 / 5 Armor Penetration.

Improves the following Summoner Spells:
Exhaust: Reduces target's Magic Resist and Armor by 10.

+2 / 4 / 6 % Armor Penetration.

Runes with Armor Penetration/Reduction

Greater Mark of armor penetration
+1.28 armor penetration

+0.9 armor penetration, +0.62 magic penetration

Greater Quintessence of armor penetration
+2.56 armor penetration

+1.79 armor penetration, +1.4 magic penetration

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Quite Nomible (29) | October 21, 2014 9:42am
Last Whisper recipe price is 1065 instead of 1025.
The Brutalizer recipe prize is 617 instead of 537.
The Black Cleaver recipe prize is 1263 instead of 1188, total cost is 3000 (error in the tooltip).

The armor penetration for Wukong's Crushing Blow is rescaled to 10/15/20/25/30% and Shyvana's Flame Breath no longer reduces armor.

The S4 masteries now include Devastating Strikes .
DarkAkumaLord (61) | April 13, 2013 5:27pm
Oh banana man you scouty boy.
Meiyjhe (535) | April 13, 2013 2:30pm
God this was outdated, updated the stats

Hmm... Maybe more stuff is outdated, maybe I will have something to do this weekend after all :D
Yuki Artwaltz (1) | April 13, 2013 2:22pm
Belatedly: yes, all the reductions stack, but the percent ones are multiplicative. The only cap, as far as I'm aware, is 0 Armor, but I could be wrong there too.

Also this page is out of date as of Season 3.
RIGGOLOL | August 18, 2012 11:57pm
hey, couple of questions... Does Tarics shatter stack with nasus circle thingy and is there a cap for armour pen like with CD reduction?
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