Armor in League of Legends reduces incoming physical damage through a percentage-based calculation. Here's a comprehensive overview of how armor works:

Basic Armor Mechanics:

• Every champion has base armor that increases per level
• Total armor = Base armor + Bonus armor (from items, abilities, runes, etc.)
• Each point of armor increases effective health against physical damage by 1%
• Armor has a gold value of 20 per point

Armor Formula: Post-mitigation damage = Physical damage × (100 / (100 + Armor))

Example Calculations (1000 damage against 1000 health):

• 25 Armor: 20% damage reduction (800 damage taken)
• 100 Armor: 50% damage reduction (500 damage taken)
• 200 Armor: 66.6% damage reduction (333.3 damage taken)

Key Considerations:

• Armor stacks additively without diminishing returns
• Negative armor cases are rare but provide increasing returns
• Optimal efficiency comes from balancing health and armor (health = 7.5 × (armor + 100))
• Armor makes healing more effective since damage is reduced

Sources of Armor:

• Items (Thornmail, Randuin's Omen, etc.)
• Champion abilities
• Runes (Aftershock, Conditioning)
• Neutral buffs (Mountain Drake)

Armor can be countered through:

• Armor penetration
• Armor reduction
• Lethality

The choice between buying armor or health depends on:

• Enemy team damage composition
• Presence of true/percent health damage
• Your champion's built-in defensive steroids
• Need for specific item effects

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