Armor penetration determines how much of a target's armor is ignored when dealing physical damage. It works alongside armor reduction to help champions deal more damage to armored targets.

Order of Calculations:

1. Flat armor reduction
2. Percentage armor reduction
3. Percentage armor penetration
4. Flat armor penetration (Lethality)

Key Points:

• Base armor and bonus armor are calculated separately
• Flat armor reduction can reduce armor below zero
• Percentage reductions/penetrations are ineffective against targets with 0 or less armor
• Armor penetration affects all physical damage sources, including attacks on turrets
• Champions start with 0 base armor penetration and lethality

Lethality:

• Replaced flat armor penetration in V6.22
• Grants full flat armor penetration at all levels as of V14.1
• Stacks additively
• Has a gold value of 30 per point

Example Calculation: Target with 300 armor (100 base + 200 bonus) affected by:

• 30 flat armor reduction
• 30% armor reduction
• 45% bonus armor penetration
• 10 flat penetration Final effective armor: 122.3

Sources of Armor Penetration:

• Champion abilities (e.g., Darius' Apprehend)
• Items (e.g., Lord Dominik's Regards)
• Runes
• Special effects (Turrets and Dragons have 30% innate armor penetration)

Maximum Values:

• Highest possible lethality: 127 (160 for Aphelios)
• Highest armor penetration percentage: 35% (61% for Darius with items)

This system allows physical damage dealers to effectively counter high-armor targets while maintaining game balance.

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