魔法抗性

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. No ranged champions gain magic resistance per level, but many melee champions do, with 52.5 being the maximum magic resistance possible without items, runes, masteries, or ally buffs.

Damage reduction

Incoming magic damage is multiplied by a factor based on the unit's magic resistance:

Damage multiplier = 100 / (100 + MR) if MR ≥ 0

Damage multiplier = 2 − 100 / (100 − MR) if MR ≤ 0

Examples:

• 25 magic resistance → ×0.8 incoming magic damage (20% reduction).
• 100 magic resistance → ×0.5 incoming magic damage (50% reduction).
• −25 magic resistance → ×1.2 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 60% 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.

Note: Unlike health, increasing magic resistance also makes healing more effective because it takes more effort to remove the unit's health than it does to restore it.

Ways to increase magic resistance

Items

• Abyssal Scepter: +57 magic resistance, +70 ability power. Unique aura: Reduces the magic resistance of nearby enemies by 20. 2650 gold.
• Aegis of the Legion: +24 magic resistance, +270 health +18 armor. Unique aura: +12 armor, +15 magic resistance, +8 attack damage to nearby allied champions. 1925 gold.
• Athene's Unholy Grail: +40 magic resistance, +90 ability power, +15 mana regeneration. Unique passive: +15% cooldown reduction. Unique passive: Restores 12% of maximum mana on kill or assist. Unique passive: Increases your mana regeneration by 1% per 1% mana you're missing. 2950 gold.
• Banshee's Veil: +50 magic resistance, +375 health +375 mana. Unique passive: Blocks one negative spell every 45 seconds. 2715 gold.
• Chalice of Harmony: +30 magic resistance, +7.5 mana regeneration. Unique passive: Increases your mana regeneration by 1% per 1% mana you're missing. 890 gold.
• Force of Nature: +76 magic resistance, +40 health regeneration, +8% movement speed. Unique passive: Restores 0.35% of your champion's health every second. 2610 gold.
• Guardian Angel: +38 magic resistance, +68 armor. Unique passive: Revives your champion upon death, restoring 750 health and 375 mana. This effect can only occur once every 5 minutes. 2600 gold.
• Hexdrinker: +30 magic resistance, +25 attack damage Unique passive: If you would take magic damage which would leave you at less than 30% of your maximum health, you first gain a shield which absorbs 250 magic damage for 5 seconds. 60 second cooldown. 1400 gold.
• Lich Bane: +30 magic resistance, +350 mana +80 ability power +7% movement speed. Unique passive: 100% chance when an ability is used that your next physical attack deals an additional 100% of your ability power in damage. This effect has a 2 second cooldown. 3470 gold.
• Maw of Malmortius: +36 magic resistance, +55 attack damage, Unique Passive: +1 Attack Damage for every 2.5% health missing, Unique Passive: If you would take magic damage which would leave you at less than 30% of your maximum health, you gain a shield which absorbs 400 magic damage for 5 seconds. 60 second cooldown 3300 gold.
• Mercury's Treads: +25 magic resistance, +35 tenacity. Unique passive: Enhanced Movement 2. 1200 gold.
• Negatron Cloak: +48 magic resistance. 740 gold.
• Null-Magic Mantle: +24 magic resistance. 400 gold.
• Odyn's Veil: +50 magic resistance, +350 health, +350 mana. Unique passive: Reduces and stores 10% of magic damage dealt to your champion. Unique Active: Deals 200 + (Stored magic damage)[Max: 400] to nearby enemy units. 90 second cooldown. 2715 gold.
• Quicksilver Sash: +48 magic resistance. Unique active: Removes all debuffs from your champion. 90 second cooldown. 1440 gold.
• Spirit Visage: +30 magic resistance, +250 health. Unique passive: Reduces ability cooldowns by 10% and increases healing and regeneration on yourself by 15%. 1550 gold.
• Wit's End: +30 magic resistance, +40% attack speed. Unique passive: Physical attacks deal 42 bonus magic damage and increase your magic resistance by 5 for 5 seconds. (stacks up to 4 times). 2150 gold.

Champion abilities

• Akali's Twilight Shroud lays down a cover of smoke for 8 seconds where she gains 10 / 20 / 30 / 40 / 50 magic resistance while inside.
• Annie's Molten Shield increases her magic resistance by 20 / 30 / 40 / 50 / 60 for 8 seconds.
• Elise's Spider Form increases her magic resistance by 10 / 15 / 20 / 25.
• Galio's Bulwark increases an allied champion's magic resistance by 30 / 45 / 60 / 75 / 90 for 4 seconds.
• Garen's Courage increases his magic resistance by 20%.
• Graves' True Grit 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.
• Jax's Grandmaster's Might increases his magic resistance by 25 / 35 / 45 (+20% AP) for 8 seconds.
• Kennen's Lightning Rush increases his magic resistance by 10 / 20 / 30 / 40 / 50 for 4 seconds.
• Jayce's Transform: Mercury Hammer increases his magic resistance by 5 / 15 / 25 / 35.
• Leona's Eclipse increases her magic resistance by 30 / 40 / 50 / 60 / 70 for 3 seconds. The duration of the buff is doubled if any enemies are damaged by the ability.
• Master Yi's Meditate increases his magic resistance by 100 / 150 / 200 / 250 / 300 for up to 5 seconds.
• Mordekaiser's Creeping Death increases an allied unit's magic resistance by 10 / 15 / 20 / 25 / 30 for 6 seconds.
• Nidalee's Aspect of the Cougar grants her 10 / 20 / 30 magic resistance while in cougar form.
• Olaf's Ragnarok increases his magic resistance by 30 / 45 / 60 for 6 seconds.
• Orianna's Command: Protect increases an allied champion's magic resistance by 10 / 15 / 20 / 25 / 30 as long as the ball is attached to it.
• Rammus' Defensive Ball Curl increases his magic resistance by 40 / 60 / 80 / 100 / 120 for 6 seconds.
• Rengar's Battle Roar Rengar lets out a battle roar, damaging enemies increases his magic resist by 15 / 22 / 29 / 36 / 43 for 3 seconds.
• Shyvana's Dragon's Descent passively increases her magic resistance by 10 / 15 / 20. This bonus is doubled while she is in dragon form.
• Singed's Insanity Potion increases his magic resistance by 35 / 50 / 65 for 25 seconds.
• Sona's Aria of Perseverance:
  • Aura: increases nearby allied champions' magic resistance by 3 / 6 / 9 / 12 / 15 while active and persists for two seconds after deactivation.
  • Activation: increases hers and one nearby allied champion's magic resistance by an extra 8 / 11 / 14 / 17 / 20 for 3 seconds.
• Soraka's Consecration increases nearby allied champions' magic resistance by 16.
• Trundle's Agony increases his magic resistance by 15% / 20% / 25% of the target enemy's magic resistance, and doubles the amount over the next 6 seconds.
• Urgot's Hyper-Kinetic Position Reverser increases his magic resistance by 60 / 90 / 120 for 5 seconds.
• Wukong's Stone Skin grants him magic resistance for each nearby enemy champion.
• Xin Zhao's Crescent Sweep increases his magic resistance by 15 / 20 / 25 for each enemy champion hit for 8 seconds.

Masteries

• Resistance Resistance increases your champion's magic resistance by 2 / 4 / 6.

Runes

• Shielding and Warding runes may also increase magic resistance.

Ways to reduce magic resistance

See magic penetration. Note that magic penetration and magic resistance reduction are different.

List of champions' magic resistance

主条目：List of champions' magic resistance

Trivia

• If a summoner leaves the game, their champion gains 1000 armor and magic resistance. This may be to prevent champions like Karthus or Draven from gaining free kills.

• Kayle and Nidalee are the only two champions in the game with 0.75 magic resistance per level growth. All other champions are either 0 or 1.25.
• A level 18 Master Yi with 6 Force of Natures, 3 points in Resistance Resistance, Creeping Death, Bulwark, Aria of Perseverance, Command: Protect, Aegis of the Legion aura, Glyphs, Seals, Marks and Quintessences of Shielding, and Meditate active will give a total of approximately 1086 MR. Having an enemy Trundle with the same items and support use Agony on Master Yi will yield a total of approximately 1329 MR or 93% reduction.
• Swapping out Orianna or Mordekaiser for Trundle on the team of Master Yi and saving the Active buffs for the Trundle result in a 916.32 Master Yi, 1244.48 Enemy Trundle and 1378.56 Allied Trundle if the Allied Trundle uses Agony on the Enemy Trundle. This is the highest amount of Magic Resistance obtainable without exploiting the disconnection bonus.
• A disconnected level 18 Garen with the same items, runes, masteries and support as the above Master Yi will give a total of approximately 2144 MR after applying Courage for 95.5% reduction. Without the bonus Magic Resistance from leaving, Courage does not quite equal Meditate. This is the highest possible amount of Magic Resistance.
• Unlike the Master Yi example, a similarly kitted and supported Trundle using Agony on the Garen will actually result in a reduced 1858 Magic Resistance on the Trundle.