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Magic penetration

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Magic penetration (or spell penetration) is a champion statistic which allows the magic damage done from their abilities, enhanced attacks, etc. to ignore some or all of a target's magic resistance.

Note: Magic Penetration cannot affect enemy magic resistance beyond 0 to deal bonus damage.

Magic resistance reduction is the effect of some items and champion abilities that temporarily reduces the magic resistance of one or more targets. This allows allies to benefit from the reduction of magic resistance. This can reduce magic resistance below 0, resulting in bonus damage (see Magic resistance).

Order of calculations

Magic penetration and magic resistance reduction work exactly like armor penetration and armor reduction.

Magic penetration and magic reduction are considered on the target champion in the following order:[1]

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

Flat magic resistance reduction

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 makes a bigger difference 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 (e.g. GalioSquare.png Galio's Runic Skin.png Runic Skin).

Percentage magic penetration makes a bigger difference 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.

Flat magic penetration

The target's magic resist 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.

Examples

Given 20 flat magic resistance reduction and 30% magic resistance reduction, and the target is affected by 10 flat magic penetration and 40% magic penetration,

  • 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.

Graph of % increase in damage of mpen vs no mpen, at up to 300 MR:

Delucion MpenGraph

Increasing magic penetration

Items

  • Haunting Guise item.png Haunting Guise: Unique Passive – Eyes of Pain: +15 magic penetration. +200 health, +25 ability power. 1485 gold.
  • Liandry's Torment item.png Liandry's Torment: Unique Passive – Eyes of Pain: +15 magic penetration. +300 health, +50 ability power. Unique Passive: Dealing spell damage applies a damage-over-time effect for 3 seconds that deal 2% of target's current health bonus magic damage per second. This bonus damage is doubled against movement-impared units and capped at 100 damage per second vs. monsters. 2900 gold.
  • Sorcerer's Shoes item.png Sorcerer's Shoes: +15 magic penetration. Unique passive – Enhanced Movement: +45 movement speed. 1100 gold.
  • Void Staff item.png Void Staff: Unique Passive: Magic damage ignores 35% of the target's magic resist (applies before magic penetration). +70 ability power. 2295 gold.

Masteries

Note: Only the magic penetration bonus effect of these abilities is shown here. To read more information on each of these abilities, follow the link on each of them.

Runes

Name Type Tier 1 (Lesser) Tier 2 (Normal) Tier 3 (Greater)
Magic Penetration Mark

GMarks (1)

0.49

5 IP

0.68

35 IP

0.87

410 IP

Seal X X X
Glyph

GGlyphs (1)

X X 0.63

410 IP

Quintessence

GQuintessences (1)

1.12

15 IP

1.56

100 IP

2.01

1025 IP

Hybrid Penetration Mark

GMarks (1)

X X 0.62 magic penetration
0.9 armor penetration

820 IP

Seal X X X
Glyph X X X
Quintessence

GQuintessences (4)

X X 1.4 magic penetration
1.79 armor penetration

2050 IP

Reducing magic resistance

Items

  • Abyssal Scepter item.png Abyssal Scepter reduces the magic resistance of nearby enemy champions by 20 (700 range).
  • Wit's End item.png Wit's End basic attacks reduce the target's magic resistance by 5 on hit, stacking up 5 times.

Champion abilities

Percentage reduction:

  • KogMawSquare.png Kog'Maw's Caustic Spittle.png Caustic Spittle reduces the magic resistance of the target by 12 / 16 / 20 / 24 / 28% for 4 seconds.
  • TrundleSquare.png Trundle's Subjugate.png Subjugate reduces the magic resistance of his target by 20% and gains for the same amount. This amount is doubled over the next 4 seconds. The magic resistance reduction lasts for another 4 seconds after the drain completes.
  • JayceSquare.png Jayce's Transform- Mercury Cannon.png Transform: Mercury Cannon empowers his next auto attack to reduce the enemy's magic resistance by 10 / 15 / 20 / 25% for 5 seconds.
  • KarthusSquare.png Karthus's Wall of Pain.png Wall of Pain reduces the magic resistance of all targets affected by 15% for 5 seconds.
  • KayleSquare.png Kayle's Holy Fervor.png Holy Fervor allows her autoattacks against enemy champions reduces their magic resistance by 3% for 5 seconds. This debuff stacks up to 5 times.

Flat reduction:

  • AmumuSquare.png Amumu's Cursed Touch.png Cursed Touch passively makes his autoattacks reduce the magic resistance of enemies hit by 15 / 20 / 25 for 3 seconds.
  • FiddlesticksSquare.png Fiddlesticks's Dread.png Dread passively makes dealing magic damage or casting Terrify.png Terrify reduce the magic resistance of the enemy hit by 10.
  • RyzeSquare.png Ryze's Spell Flux.png Spell Flux reduces the magic resistance of all targets hit by 8 / 9 / 10 / 11 / 12% for 5 seconds, stacking up to 3 times.

Notes

  • Magic penetration is a very valuable stat for casters. There are few sources for it and so Magic Penetration marks are very popular runes.
  • Since percentage penetration is applied before flat penetration, it is highly recommended to combine both statistics.
  • Commonly only one of Abyssal Scepter item.png Abyssal Scepter or Void Staff item.png Void Staff is built depending on how much magic resistance the enemy team is using.
  • Magic penetration not only affects all champion abilities that deal magic damage, but also affects magic damage items.
    • The actives on items like Hextech Gunblade item.png Hextech Gunblade benefit from magic penetration as well.

See also

References

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