Magic resistance (MR) is a defensive stat that reduces incoming magic damage by a percentage. Here's everything you need to know about how it works:

Magic Resist Formula:

• Damage reduction = 100 / (100 + MR)
• Each point of magic resistance increases effective health against magic damage by 1%
• Example: 100 MR = 50% magic damage reduction

Key Points:

• Magic resistance stacks additively
• Base MR varies by champion type:
  • Melee champions: 32-66.85 (based on level)
  • Ranged champions: 30-52.1 (based on level)
• Bonus MR can be gained from items, abilities, runes, and buffs

Optimal Usage:

• Balance MR with health for maximum effectiveness
• The ideal ratio is: Health = 6.75 × (MR + 100)
• Consider enemy damage types when building resistance
• MR is especially effective against burst magic damage
• Healing becomes more efficient with higher MR

Sources of Magic Resistance:

• Items: Force of Nature, Hullbreaker, Spirit Visage
• Champion abilities like Garen's Courage, Leona's Eclipse
• Runes: Aftershock, Conditioning
• Neutral buffs like Mountain Drake

Counter-mechanics:

• Magic penetration and MR reduction can negate magic resistance
• True damage bypasses MR completely
• Percent health damage reduces the effectiveness of stacking MR

The highest achievable MR in game is 1,464 (93.6% damage reduction) on Rammus with a specific build combination of items, runes, and buffs.

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