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Stat of a hero that provides protection from Physical damage. The more armor a hero has, the more reduction in damage it provides.


Chiron with 159 armor receives an Auto-Attack for 183 physical damage. Cassandra then uses "Proph-Icy" to increase his armor by 44. He now, at a total of 203 armor takes 156 physical damage on a 2nd Auto-Attack.

From this scenario, we can conclude that an increase of 44 armor from an armor value of 159, or + 27.67%, reduces his damage taken from physical attacks by 14.75%. At lower base armor values that addition of armor would be more beneficial.

  • ARMOR- DMG Taken(PHY)
  • 226....145
  • 203....156
  • 182....168
  • 159....183



As you can see , as armor increases, one receives less and less of a benefit. If this was graphed it would be in the shape of a log curve. This is the idea of how diminishing returns works; as one stat goes up more and more(armor), the other stat is correlated and goes up also, but considerably less and less(PHY dmg taken).

Armor and reduction can be represented in this equation and table:

(-2.35E-5)*(armor^2) + (7.10E-3)*armor = % damage reduction


  • Armor Reduction
  • 400...80%
  • 350...77%
  • 300...73%
  • 275...71%
  • 250...69%
  • 225...66%
  • 200...63%
  • 175...60%
  • 150...56%
  • 125...52%
  • 100...47%
  • 75....40%
  • 50....30%
  • 25....13%
  • 0.....0%
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