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From Liquipedia StarCraft 2 Wiki

Armor is an attribute every unit and structure with health points bears. Damage from incoming attacks is reduced by the amount of armor: each point of armor reduces the damage received by one point. Units attacking in volleys, such as the Zealot and the Thor, have the target's armor applied to each of their attacks.

Units commonly have a base armor ranging from 0 to 3 and gain 1 additional armor for each armor upgrade affecting them. All combat units have at least one armor upgrade affecting them. Buildings commonly have an armor of 1.

Protoss Plasma Shields use a separate armor value for computing damage to the shields, starting at 0 for all Protoss units and buildings and growing by 1 for every Shields Upgrades.

Armor is commonly notated in the form x (+y), expressing the unit has x base armor, and gains y armor for every armor upgrade affecting the unit.

Upgrades Affecting Armor[edit]




Abilities Affecting Armor[edit]


  • Bonus damage from unit attributes such as Biological or Light is applied to an attack before armor.
  • Armor cannot reduce damage below 0.5, every attack deals at least 0.5 damage.
  • Armor does not reduce damage dealt by abilities.
  • Armor is not capped at zero: if a unit with 0 base armor is affected by the Raven's Anti-Armor Missile, it will have an armor value of -3.