Armor is an attribute shared by all units. Armor is used to determine the amount of damage reduction a unit takes from damage (if it's Physical Armor) and energy damage (if it's Energy Damage) sources. Higher armor values reduce more damage. Armor is increased with each level or with certain abilities and items.

Armor Types

There are two types of armor: Physical Armor and Energy Armor. They function similarly, except Physical Armor will only reduce damage from physical damage and is only affected from physical penetration and shred, while Energy Armor will only reduce damage from energy damage and be affected from energy penetration and shred.

Damage reduction


Damage reduction values

All units, including Structures, have an inherent armor value. Any damage dealt to a unit suffers a damage reduction depending on the target's armor.

The formula to calculate a hero's damage reduction is:

$ \color{Gray}{DR = A-AP/(100+(A-AP)+10\times(HL-1))} $


  • DR is damage reduction
  • A is armor
  • AP is armor penetration
  • HL is Hero Level

In Paragon, the cap on this number is 100% damage reduction, but it requires an infinite amount of armor to truly reach the cap.

Armor Penetration

Armor Penetration makes your abilities ignore armor equal to it's value. Penetration higher than enemy's Armor has no effect.

Armor Shred

Armor Shred reduce the target's Armor equal to it's value. The difference between Shred and Penetration is that Shred also reduces armor for all friendly units, allowing them to deal more damage to the target.

Armor Shred stacks with Armor Penetration.

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