Magic penetration

 Magic penetration (also referred to as  MPen) is a champion statistic that determines the amount of a target's  magic resistance that will be ignored when the user deals magic damage. Percentage magic penetration and flat magic penetration have no effect if the target's magic resistance is less than or equal to 0.

Magic resistance reduction is an effect that reduces the target's magic resistance for a period of time, by an amount or percentage. Flat magic resistance reduction can reduce the value below 0, while percentage magic resistance reduction cannot.

It is important to note that penetration treats the target's resistances as being multiplied by a percentage or reduced by a flat amount, in contrast to reduction which applies to the target's resistances as a whole.

All champions have 0 base flat magic penetration and percent magic penetration, but they can be increased by items, runes, and with certain champions' passive ability effects.

Order of calculations

Magic penetration and magic resistance reduction are considered in the following order:

1. Magic resistance reduction, flat
2. Magic resistance reduction, percentage
3. Magic penetration, percentage
4. Magic penetration, flat

Flat magic resistance reduction

The target's magic resistance is reduced by an amount. Flat magic resistance reduction stacks additively.

Example: 20 magic resistance reduction reduces the target's magic resistance by 20, so a target with 30 magic resistance will be reduced to 10 magic resistance. (30 − 20 = 10)

Flat magic resistance reduction can reduce a target's magic resistance below zero. For example, if an enemy with 10 magic resistance has their magic resistance reduced by 25, the enemy will have −15 magic resistance.

Percentage magic resistance reduction

The target's magic resistance is multiplied by a percentage (100% − the listed reduction). Percentage magic resistance reduction stacks multiplicatively and is ignored if the target's magic resistance is 0 or less.

Example: 20% magic resistance reduction multiplies the target's magic resistance to 80%, so a target with 30 magic resistance will be reduced to 24 magic resist. (30 × 0.8 = 24)

Percentage magic resistance reduction reduces more magic resistance on targets with higher magic resistance. For instance, with 40% magic resistance reduction, a target with 200 magic resistance will lose 80 while a target with only 50 magic resistance will lose 20.

Percentage magic penetration

The target's magic resistance is treated as being multiplied by a percentage for purposes of damage calculation (100% − the listed penetration). Percentage magic penetration stacks multiplicatively and is ignored if the target's magic resistance is 0 or less.

Example: 20% magic penetration causes the target to take damage as if its magic resistance was multiplied by 80%, so a target with 30 magic resistance will be treated as though it had 24 for purposes of damage calculation (the target's actual magic resistance value will not change, however).

Because the target's actual magic resistance value does not change, anything else depending on that value also doesn't change.

Percentage magic penetration reduces more magic resistance on targets with higher magic resistance. For instance, with 40% magic penetration, a target with 200 magic resistance will be considered as having 80 less while a target with only 50 magic resistance will be considered as having 20 less.

Gold Value ​​

• Percentage magic penetration has a gold value of 46.15 per point.

Flat magic penetration

The target's magic resistance is treated as being reduced by an amount for purposes of damage calculation, but cannot be reduced below 0. Flat magic penetration stacks additively.

Example: 20 magic penetration causes the target to take damage as if its magic resistance was 20 less, so a target with 30 magic resistance will be treated as though it had 10 for purposes of damage calculation (the target's actual magic resistance value will not change, however).

Because the target's actual magic resistance value does not change, anything else depending on that value also doesn't change.

Gold Value ​​

• Flat magic penetration has a gold value of 46.67 per point.

Examples

Given 10 flat magic penetration and 35% magic penetration, and the target is affected by 20 flat magic resistance reduction and 30% magic resistance reduction;

• Target A has 80 magic resistance.
  • The 80 is reduced to 60 by the 20 magic resistance reduction.
  • The 60 is reduced to 42 by the 30% magic resistance reduction.
  • The 42 is considered to be 27.3 by the 35% magic resistance penetration.
  • The 27.3 is considered to be 17.3 by the 10 magic resistance penetration.
  • Target A takes damage as if it has 17.3 magic resistance.
• Target B has 18 magic resistance.
  • The 18 is reduced to −2 by the 20 magic resistance reduction.
  • The −2 is not affected by any further calculations because it is less than 0.
    • Target B takes damage as if it has −2 magic resistance.

Increasing flat magic penetration

Items

This table is automatically generated based on the data from Module:ItemData/data.

Item	Cost	Amount	Availability
Detonation Orb Detonation Orb	0	12	Arena
Shadowflame Shadowflame	3200	15	Nexus Blitz, Arena, Classic Summoner's Rift 5v5, All Random All Mid
Sorcerer's Shoes Sorcerer's Shoes	1100	12	Nexus Blitz, Arena, Classic Summoner's Rift 5v5, All Random All Mid
Spellslinger's Shoes Spellslinger's Shoes	1850	18	Nexus Blitz, Classic Summoner's Rift 5v5, All Random All Mid
Stormsurge Stormsurge	2900	15	Nexus Blitz, Arena, Classic Summoner's Rift 5v5, All Random All Mid
Talisman of Ascension Talisman of Ascension	0	0	Arena

Increasing percent magic penetration

Champion abilities

• Mordekaiser's Death's Grasp

Items

This table is automatically generated based on the data from Module:ItemData/data.

Item	Cost	Amount	Availability
Blighting Jewel Blighting Jewel	1100	13%	Nexus Blitz, Classic Summoner's Rift 5v5, All Random All Mid
Cryptbloom Cryptbloom	2850	30%	Nexus Blitz, Arena, Classic Summoner's Rift 5v5, All Random All Mid
Perplexity Perplexity	2500	30%	Arena
Spellslinger's Shoes Spellslinger's Shoes	1850	8%	Nexus Blitz, Classic Summoner's Rift 5v5, All Random All Mid
Talisman of Ascension Talisman of Ascension	0	0%	Arena
Void Staff Void Staff	3000	40%	Nexus Blitz, Arena, Classic Summoner's Rift 5v5, All Random All Mid

Item passives

• Terminus

Reducing magic resistance

Champion abilities

Percentage reduction

• Briar's Head Rush
• Evelynn's Allure
• Jayce's Transform Mercury Cannon
• Karthus' Wall of Pain
• Kayle's Radiant Blast
• Kog'Maw's Caustic Spittle
• Mordekaiser's Realm of Death
• Rell's Break the Mold
• Rumble's Electro Harpoon
• Trundle's Subjugate
• Zoe's Sleepy Trouble Bubble

Flat reduction

• Corki's Gatling Gun
• Rell's Break the Mold

Items

Percentage reduction

• Bloodletter's Curse

Flat reduction

• Malignance

Monsters

Flat reduction

• Atakhan's Frail and Unworthy
• Baron Nashor's Void Corruption

Notes

• Magic penetration will apply to any and all sources of magic damage.
  • It will apply to the damage dealt to any unit, including turrets.
• Magic resistance reduction will affect the magic damage from any unit source.
• Percentage penetration is applied before flat penetration.

Trivia

Last updated: V25.05

Highest Magic Penetration (flat)

The highest amount of flat magic penetration any champion can obtain is 48.

• Items:
  • Spellslinger's Shoes - 18
  • Shadowflame - 15
  • Stormsurge - 15
• Relevant mathematics:
  • Items = 18 + 15 + 15 = 48 flat magic penetration

Highest Magic Penetration (%)

The highest amount of percentage magic penetration any champion can obtain is 44.8% due to Void Staff and Spellslinger's Shoes.

• Relevant mathematics:
  • (1 - 0.4) × (1 - 0.08) = 0.552
    • 1 - 0.552 = 0.448 × 100 = 44.8% magic penetration

The highest amount obtainable in the game is 53.08% with Mordekaiser when he has Void Staff, Spellslinger's Shoes and his Death's Grasp is at rank 5.

• Relevant mathematics:
  • (1 - 0.4) × (1 - 0.08) × (1 - 0.15) = 0.4692
    • 1 - 0.4692 = 0.5308 × 100 = 53.08% magic penetration

Media

• 

  Magic resistance reduced indicator

• 

  Armor and magic resistance reduced indicator

See also

• Magic resistance
• Armor penetration
• Champion's stats

References

Champion statistics

League of Legends content

Stacks additively

An effect that stacks additively can be calculated by adding the effects together.

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Most champion statistics that stack this way are expressed through flat numbers, but the stats can also be percentages. The following stats stack additively:

•  Ability haste
•  Ability power
•  Armor
•  Lethality and flat armor reduction
•  Attack damage
•  Attack speed
•  Critical strike chance
•  Critical strike damage
•  Heal and shield power
•  Health
•  Health regeneration
•  Life steal
•  Magic resistance
•  Flat magic penetration and reduction
•  Mana
•  Mana regeneration
•  Omnivamp
•  Physical vamp

League of Legends content

Stacks multiplicatively

An effect that stacks multiplicatively can be calculated by multiplying the effects together.

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Most champion statistics that stack this way are expressed through percentages. The following stats stack multiplicatively:

• Attack speed reduction
• Damage modifiers
•  Percent armor penetration and reduction
•  Percent magic penetration and reduction
• Slow potency reduction

League of Legends content

Death's Grasp

COOLDOWN: 18 / 16 / 14 / 12 / 10

Passive: Mordekaiser gains  magic penetration.

Active: Mordekaiser summons a claw in the target direction that grants sight of the area. After a brief time, it deals magic damage and pulls enemies hit.

League of Legends content

Head Rush

COOLDOWN: 13 / 12 / 11 / 10 / 9

Active: Briar leaps to the target unit. If the target is an enemy, she deals physical damage, stuns them briefly, and additionally  reduces their armor for a few seconds.

League of Legends content

Allure

COOLDOWN: 15 / 14 / 13 / 12 / 11

Active: Evelynn curses the target enemy, causing her next attack against the target to expunge the curse, slowing the target and refunding the  mana cost.

If the curse matures long enough, the expunge will increase the slow, charm the target, and apply an additional effect based on the target type. Champions have  reduced magic resist for a few seconds. Monsters are dealt bonus magic damage and increased charm duration.

League of Legends content

Transform Mercury Cannon

COOLDOWN: 6

Active: Jayce transforms into Cannon Stance, becoming ranged with greater  attack range and gaining new abilities.

His next basic attack will reduce the target's  armor and  magic resist for a few seconds.

Jayce begins the game with Transform but cannot increase its rank. Instead, his basic abilities each have 6 ranks.

League of Legends content

Wall of Pain

COOLDOWN: 15

Active: Karthus erects a wall of pain at the target location that lasts a few seconds, enemies that touch it suffer reduced  magic resistance and become slowed for a few seconds.

League of Legends content

Radiant Blast

COOLDOWN: 12 / 11 / 10 / 9 / 8

Active: Kayle summons a celestial sword that travels forward and expands upon hitting a target, dealing magic damage, slowing, and reducing the  armor and  magic resist of all targets struck.

League of Legends content

Caustic Spittle

COOLDOWN: 7

Passive: Kog'Maw gains  bonus attack speed.

Active: Kog'Maw ejects a wad of spittle in the target direction that deals magic damage to the first enemy hit, reducing their  armor and  magic resistance for a few seconds.

League of Legends content

Realm of Death

COOLDOWN: 140 / 120 / 100

Active: Mordekaiser slows the target enemy champion, then banishes them with him to the Death Realm for a few seconds, cancelling all interactions with non-banished units.

Additionally, Mordekaiser heals himself for a portion of the target's maximum health and temporarily steals a portion of their current  attack damage,  ability power,  total attack speed,  maximum health,  armor,  magic resist, and size.

If the target dies while inside the Death Realm, Mordekaiser keeps his stolen stats until they respawn.

Death Realm: The Death Realm confines units in a small area. Allies and enemies cannot see or interact with those in the Death Realm but can see their locations and vice versa.

League of Legends content

Break the Mold

Innate: Rell's basic attacks reduce the target's  armor and  magic resist for a few seconds. Basic attacks against enemy champions will refresh the duration for all nearby afflicted enemies.

Rell gains  bonus armor and  bonus magic resist equal to the sum reduced from all afflicted enemies, Break the Mold's damage is increased by the sum resistances reduced from the target.

League of Legends content

Electro Harpoon

RECHARGE: 6

Active: Rumble shoots a harpoon in the target direction that deals magic damage and briefly slows the first enemy hit, reducing their  magic resist for a few seconds. These effects can stack with multiple harpoons.

Rumble periodically stocks an Electro Harpoon, up to a cap.

Danger Zone Bonus: Electro Harpoon's effects are increased.

League of Legends content

Subjugate

COOLDOWN: 120 / 100 / 80

Active: Trundle drains the life force of the target enemy champion, dealing magic damage based on their maximum health and healing for the same amount. He also steals a portion of their  armor and  magic resist, and increases in size while reducing their size.

Half of the damage and stealing is applied instantly, and the other half is applied over a few seconds. The armor and magic resist will remain stolen for a few seconds afterwards.

League of Legends content

Sleepy Trouble Bubble

COOLDOWN: 16 / 15 / 14 / 13 / 12

Active: Zoe kicks a bubble in the target direction that bursts upon the first enemy hit. At max range, it will linger as a trap for a few seconds that bursts upon enemy contact.

The burst deals magic damage and briefly inflicts drowsy, which gradually slows them. Afterwards, the target falls asleep for a short time, during which they cannot act.

If the target is attacked during Sleep by an enemy champion, large monster, or turret, they wake up and take bonus true damage equal to the attack, up to a cap.

League of Legends content

Gatling Gun

COOLDOWN: 12

Active: Corki's gatling gun rapidly fires in a cone in front of him, continually dealing physical damage to enemies hit and applying stacks of Gatling Gun.

Gatling Gun: For each stack, the target loses  armor and  magic resist.

League of Legends content

Void Corruption

Aura of Destruction: Baron Nashor applies stacks of the Void Corruption debuff to his targets, lasting for 8 seconds and stacking up to 100 times. For each stack, the unit's  armor and  magic resistance are reduced by 0.5, up to a maximum total of 50 resistances reduction.

---

Baron Nashor applies two stacks of Void Corruption on his ranged basic attack and one stack through his Corrosion attack, which prioritizes the unit with the least stacks. Any attack or ability from Baron Nashor will refresh the duration of the debuff.

League of Legends content

Magic damage

• Applies:
  • Corrupting Potion
  • Morellonomicon's and Oblivion Orb's Grievous Wounds
  • Omnivamp
• Triggers:
  • Hexdrinker's and Maw of Malmortius' Lifeline
• Mitigated by:
  • Damage shields
  • Invulnerability
  • Damage reduction
  •  Magic resistance
  • Magic shields

League of Legends content

Turret

A turret, also called a tower, is a fortification that defends a part of territory. It provides vision of the area and autonomously fires homing bolts at nearby enemies, establishing a defensive ground for allies.

Turrets are most notable in Classic, defending against waves of enemy Minions from their ultimate goal of destroying the nexus. Champions work to destroy enemy turrets to push their assault into the enemies' territory. Turrets visually fall apart as they take damage.