Magic Penetration
How does Magic Penetration/Magic Resist Reduction
Magic Penetration and Magic Resist Reduction are the statistics of a Champion which allows them to counter some or all of a target's magic resist. All champions have 0 base magic penetration but can increase it with items, runes, or abilities for a few champions.
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Magic penetration and Magic Resist reduction are applied in the following order:
1. Percentage Magic Resist Reduction (  Karthus's  Wall of Pain)2. Flat Magic Resist Reduction (  Abyssal Scepter)3. Flat Magic Resist Penetration (  Greater Quintessence of Magic Penetration)4. Percentage Magic Resist Penetration (  Void Staff)
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Items with Magic Penetration/Magic Resist Reduction
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Total Price: 2295
Recipe Price: 1000 // 70 Ability Power. UNIQUE Passive: +35% Magic Penetration |
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Total Price: 2560
Recipe Price: 980 // 70 Ability Power, 45 Magic Resistance. UNIQUE Aura: Reduces the Magic Resist of nearby enemy champions by 20. |
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Total Price: 1100
Recipe Price: 750 // 15 Magic Penetration. UNIQUE Passive: 45 Movement Speed |
Some Abilities with Magic Penetration/Magic Resist Reduction
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 Xerath anchors himself to the ground he is standing on for up to 8 seconds, increasing the range of all his spells by 400 and granting him bonus magic penetration. Upon disabling this ability, Xerath gains 35% movement speed for 2 seconds. He can deactivate the ability at any time after 0.5 seconds of casting it.
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 Trundle immediately steals his target’s health and a percentage of their armor and magic resistance. Over the next 6 seconds the amount of health, armor, and magic resistance stolen is doubled.
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In human form,
 Nidalee lays a damaging trap for unwary opponents that, when sprung, deals magic damage over 2 seconds and reveals the target and reduces their armor and magic resistance for 12 seconds. As a cougar, she lunges forward, dealing magic damage to enemies around her landing area.
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Passive: Increases attack speed. Active:
 Kog'Maw launches a corrosive projectile which deals magic damage and reduces The target's armor and magic resist for 4 seconds.
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 Amumu's attacks reduce the target's magic resistance by 15 / 25 / 35 for 4 seconds.
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Runes with Magic Penetration/Magic Resist Reduction
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+0.87 magic penetration
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+0.9 armor penetration, +0.62 magic penetration
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+0.63 magic penetration
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+2.01 magic penetration
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+1.79 armor penetration, +1.4 magic penetration
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Masteries with Magic Penetration/Magic Resist Reduction
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+8% Magic Penetration.
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Improves the following Summoner Spells:
 Exhaust: Reduces target's Magic Resist and Armor by 10.
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Does Magic Penetration of 20 against a champion with Magic Resist 0 cause abilities to do extra damage? |
 Aroddo Posts: 4 Joined: 2010-02-15 |
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Yes, it would but every champion has at least natural 30 Magic Resist from the start so you will never face a champion with 0 Magic Resist unless you have enough Magic Penetration. 
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 Apfeljack Notable (43) Posts: 265 Joined: 2011-12-03 IGN: M35 Mako on EUW View My Blog |
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Hey, |
 limberwidget Posts: 1 Joined: 2012-10-05 |
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Stats updated limberwidget wrote:
Hey,
How exactly does magic pen work? I bought magic pen runes instead of armor pen runes but I am still doing a significant amount of damage as Varus... How ever his attacks are basic attacks that run off attack damage, so what exactly is coming out of my arrows and what is hitting my enemy? -A confused soul. You shouldn't get MPen as Varus :P Get it as an AP champ :P |
 Meiyjhe <Scout> Distinguished (240) 
Posts: 2533 Joined: 2012-10-27 IGN: Meiyjhe the Epic on EUW View My Blog |
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Please include Soraka's starcall under abilities that reduce magic resistance. Her passive also increases the magic resistance of nearby allies. |
 Espheri Posts: 1 Joined: 2013-04-25 |
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It says "some abilities" so I assume it's purposely given as an incomplete list.
Might have missed a couple. |
 Satella <Editor> Prominent (104) Posts: 1100 Joined: 2012-11-23 View My Blog |
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Should be updated since % pen is now applied before flat. Not sure how it now works with reductions.      
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 GrandmasterD <Shoutcaster> Distinguished (253) 
Posts: 3510 Joined: 2011-09-26 IGN: GrandmistressD on EUW View My Blog |
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http://na.leagueoflegends.com/board/showthread.php?p=32707861#32707861 Quoted:
The order of effects are as follows:
1. Flat Reduction 2. Percentage Reduction 3. Percentage Penetration 4. Flat Penetration |
Satella <Editor> Prominent (104) Posts: 1100 Joined: 2012-11-23 View My Blog |
I told satella once to bite me
Dread
Spell Flux
Tormented Soil
Malady
Bushwhack
Holy Fervor
Starcall
Mercury Cannon
H-28G Evolution Turret
