Magic penetration is a champion statistic that ignores a portion of the target's magic resistance when dealing 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 which reduces the target's magic resistance by an amount for a period of time. Flat magic resistance reduction can reduce the value below 0, percentage magic resistance reduction cannot.
All champions have 0 base magic penetration, but it can be increased with items, runes, and some champion abilities.
Order of calculations
Magic penetration and magic resistance reduction are considered in the following order:^{[1]}
- Magic resistance reduction, flat.
- Magic resistance reduction, percentage.
- Magic penetration, percentage.
- Magic penetration, flat.
Base magic resistance and bonus magic resistance are calculated separately.
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.
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.
Gold Value
Examples
Given 20 flat magic resistance reduction and 30% magic resistance reduction, and the target is affected by 10 flat magic penetration and 35% 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.
Increasing magic penetration
Champion abilities
Items
This table is automatically generated based on the data from Module:ItemData/data.
Item | Cost | Amount | Availability |
---|---|---|---|
1250 | 15% | All maps | |
3400 | 10 | All maps | |
3200 | 6 | All maps | |
3400 | 6 | All maps | |
1100 | 18 | All maps | |
3200 | 10 | All maps | |
2700 | 40% | All maps |
Item passives
- ( )
- ( )
- ( )
Runes
Reducing magic resistance
Champion abilities
- Percentage reduction
- Flat reduction
Monsters
- Flat reduction
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
The highest amount of flat magic penetration any champion can obtain is 54.
- Items:
- - 18
- Mythic Bonus - 20 (from 4 Legendary items)
or - 10
- Runes:
- - 6
- Relevant mathematics:
- Items = 20 + + / = 48 magic penetration
- Runes =
- Total Magic Penetration = 48 + 6 = 54
= 6 magic penetration
The highest amount of percentage magic penetration any champion can obtain is 55%.
- Items:
- - 40%
- Mythic Bonus - 25% (from 5 Legendary items, includes )
/
- Relevant mathematics:
- Items: = (1 - 0.25) = 0.45
- 1 - 0.45 = 55% magic penetration
) × (1 -
- Items: = (1 - 0.25) = 0.45
- The highest amount obtainable in the game is 61.75% with
- Relevant mathematics:
- (1 - 0.25) × (1 - ) = 0.3825
- 1 - 0.3825 = 61.75% magic penetration
) × (1 -
- (1 - 0.25) × (1 - ) = 0.3825
when (max rank) is included in the equation.
- Relevant mathematics:
See also
References
- ↑ If I technically had 100% armor reduction on an enemy... at League of Legend
Offensive | Ability power · Attack damage · Attack speed · Critical strike chance · Critical strike damage · Armor penetration · Magic penetration · Life steal · Omnivamp · Physical vamp · True damage |
---|---|
Defensive | Heal and shield power · Health · Health regeneration · Armor · Magic resistance · Tenacity · Slow resist |
Utility | Ability haste · Energy · Energy regeneration · Mana · Mana regeneration |
Other | Experience · Gold generation · Movement speed · Range |