Armor is a defensive statistic that reduces incoming physical damage by a percentage. Every champion has base armor that increases with level, plus potential bonus armor from items, abilities, runes, and buffs.

The formula for damage reduction is: Post-mitigation damage = Physical damage × (100 / (100 + Armor))

Key points about armor:

• Each point of armor increases effective health against physical damage by 1%
• Armor has a gold value of 20 per point
• Base armor at level 18 ranges from 87 (Kassadin) to 149.4 (Mega Gnar), excluding Thresh
• Armor can be reduced by penetration, reduction effects, and Lethality

Optimal armor vs health balance:

• The ideal ratio is roughly health = 7.5 × (armor + 100)
• Items providing both stats are most efficient
• Other factors to consider:
  • Enemy damage types
  • Healing effects
  • Enemy penetration/true damage
  • Champion-specific bonuses

Maximum possible armor:

• Standard: 3,538 armor (Level 18 Rammus with full defensive build)
• Infinite: Thresh can theoretically reach 910,296+ armor through passive stacking

Notable armor-scaling abilities:

• Rammus: Defensive Ball Curl
• Malphite: Thunderclap
• Leona: Eclipse
• Taric: Various abilities
• Braum: Stand Behind Me

For optimal damage reduction, balance armor with health based on:

• Enemy team composition
• Your champion's abilities
• Available items and gold
• Team composition needs

The relationship between armor and effective health remains linear, with each point of armor consistently providing 1% more effective health against physical damage.

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