Magic resistance

Magic resistance (or MR) is a stat that all units have, including minions, monsters, and buildings. Increasing magic resistance reduces the magic damage the unit takes. Each champion begins with some magic resistance which may increase with level. You can gain additional magic resistance from abilities, items, masteries, and runes. Magic resistance stacks additively.

All champions begin with 30 base magic resistance. Currently no ranged champion gains magic resistance per level, but most melee champions do except, , , , , and.

,,  ,  and  do not gain magic resistance per level because they are not always melee champions due to their variable attack range.

All champions that do gain magic resistance per level gain magic resistance per level, reaching  base magic resistance at level 18.

Damage reduction
Magic Resistance reduces the damage of incoming magical attacks by a percentage. This percentage is determined by the formula: Damage Reduction = Total Magic Resistance / (100 + Total Magic Resistance). For example, a champion with 150 points of magic resistance would receive 60% reduced damage from magical attacks. Incoming magic damage is multiplied by a factor based on the unit's magic resistance(same with armor):

$${\rm Damage\ multiplier}=\begin{cases} {100 \over 100+{\it MR}}, & {\rm if\ }{\it MR} \geq 0\\ 2 - {100 \over 100 - {\it MR}}, & {\rm otherwise} \end{cases}$$

Examples:
 * 25 magic resistance &rarr; &times; incoming magic damage (20% reduction).
 * 100 magic resistance &rarr; &times; incoming magic damage (50% reduction).
 * &minus;25 magic resistance &rarr; &times; incoming magic damage (20% increase).

Stacking magic resistance
Every point of magic resistance requires a unit to take 1% more of its maximum health in magic damage to be killed. This is called "effective health."
 * Example: A unit with 60 magic resistance has 160% of its maximum health in its effective health, so if the unit has 1000 maximum health, it will take 1600 magic damage to kill it.

What this means: by definition, magic resistance does not have diminishing returns, because each point increases the unit's effective health against magic damage by 1% of its current actual health value whether the unit has 10 magic resistance or 1000 magic resistance.

For a more detailed explanation, see this video.


 * Unlike health, increasing magic resistance makes healings and shields more effective because it requires more effort from your enemies to remove the bonus health granted. This is called indirect scaling.

Magic Resistance as Scaling
These use the champion's magic resistance to increase the magnitude of the ability. It could involve total or bonus magic resistance. By building magic resistance items, you can receive more benefit and power from these abilities.

Champions

 * grants magic resistance equal to of his bonus magic resistance to himself and the target ally (in addition to a base amount) for 3 seconds.


 * grants bonus magic resistance to himself equal to 20% of his bonus magic resistance.
 * grants him bonus ability power equal to 50% of his total magic resistance.
 * grants additional magic resist plus 20% of her bonus magic resist for its duration.
 * takes 40% of the target's magic resistance and gains an equal amount of magic resistance. Half of this magic resistance is stolen on cast, and the next half is taken over 4 seconds. The magic resistance bonus/reduction lasts for another 4 seconds after the drain completes.

Items

 * active increases its slow duration by a base amount plus of the wearer's total magic resistance.

Champion abilities

 * lays down a cover of smoke for 8 seconds where she gains magic resistance while inside.
 * allows her to enter an egg-state for up to 6 seconds upon reaching 0 health. While in this state, she will receive an magic resistance modifier of.
 * increases her magic resistance by for 5 seconds.
 * increases magic resistance by to himself and the target ally for 3 seconds.
 * increases an allied champion's magic resistance by for 4 seconds.
 * increases his magic resistance by 2level when transform into.
 * increases his magic resistance equal to 20% of bonus magic resistance.
 * increases his magic resistance by every second he remains in combat. This bonus stacks up to 10 times. Graves is considered in combat if he has dealt or received damage in the last 3 seconds.
 * increases his magic resistance by  for 8 seconds.
 * increases his magic resistance by for 4 seconds.
 * increases his magic resistance by.
 * increases her magic resistance by  for 3 seconds, deals damage after that time to units around her, and retains the defensive buff for an additional 3 seconds if any enemy is struck by the blast.
 * increases an allied unit's magic resistance by for 6 seconds.
 * passively increases his magic resistance by . He loses the passive while his ability is active.
 * increases an allied champion's magic resistance by as long as the ball is attached to it.
 * increases his magic resistance by for 6 seconds.
 * Rengar lets out a battle roar, damaging enemies increases his magic resist by for 4 seconds. Rengar gains additional 50% magic resist for each enemy champion or large monster hit.
 * passively increases her magic resistance by . This bonus is doubled while she is in dragon form.
 * increases his magic resistance by for 25 seconds.
 * immediately steals 20% of the target's magic resistance, and a further 20% over 4 seconds. These magic resistance bonuses lasts for another 4 seconds after the drain completes.
 * increases his magic resistance by for 5 seconds.
 * grants him magic resistance for each nearby enemy champion.
 * increases his magic resistance by for each enemy champion hit for 8 seconds.

Masteries

 * increases bonus Armor and Magic Resistance by.
 * increases Magic Resistance by.
 * increases Armor by and Magic Resistance by  for each nearby enemy champion.

Runes

 * runes and  runes increase magic resistance.

Other

 * Disconnecting gives approximately +1000 magic resistance.

Ways to reduce magic resistance
See magic penetration. Note that magic penetration and magic resistance reduction are different.

Trivia

 * Prior to Patch 3.10, a level 18  with 1, 5 , 3 points in , 3 points in , , , , , an allied  aura, a full page of  runes, and  active gave a total of approximately 1004 magic resist. Switching  for  and having an enemy  with the same setup use  on  and the allied  use  on the enemy , yielded a total of approximately 1297 magic resist. This is the highest possible amount of magic resistance, which is reduction.
 * If disconnects from the fountain and has the same setup, he will have 2108 magic resist. This is a  reduction.
 * NOTE: This calculation does not include the mastery.

Magic resistance Magieresistenz Resistencia mágica Résistance magique Odporność na magię 魔法抗性