Armor-Piercing - Armor-Piercing attacks ignore the target enemy's Armor.
Type: effect - Category: Damage, Damage Reduction
See also: | 
Armor-Piercing | 
Boosted Damage | 
Chaos Damage | 
Chaos Damage Reduction | 
Damage Reduction | 
Extra Attacks | 
Health Loss | 
Splash Damage | 
Unhealable Damage
The attack ignores any armour protection.
For example, an Armour-Piercing shot will ignore the 25% Damage Reduction from an 
Armored trait.
Heroes
The following heroes have or can inflict/apply Armor-Piercing:
Chaos Missile (Basic Attack): Basic Ranged Chaos attack on a single target. Chaos Damage is shield and armor-piercing and it cannot be dodged or parried. It ignores the five Elemental Resistances as well as Damage Reduction. But never scores a CRIT.
Soulrend (Basic Attack): A Basic Armor-Piercing Melee Physical attack.
Purging Cleave (Special Attack): Armor-Piercing Melee Physical attack that purges 3 Buffs on hit, and also purges 3 Buffs from all other enemies on a killing blow. Starts Powered.
Wounding Cleave (Special Attack): Armor-Piercing Melee Physical attack with a chance to Wound. Rage adds additional hits on random enemies.
Wildfire Breath (Special Attack): Armor-Piercing Ranged Fire attack with a chance to inflict Wildfire Burn. Purges all debuffs on Ferno.
Iaijutsu Strike (Special Attack): Armor-Piercing Melee Physical attack with a chance to Wound, and purges Taunt on the target enemy (if any).
Tooth And Nail (Special Attack): 3 Armor-Piercing Melee Physical attacks on target enemy, then gains Unbreakable Heart for 3 turns. Switches to 'To War!: Cavalry'.
Arcane Bolts (Special Attack): Armor-Piercing and Shield-Piercing Ranged Spirit attack on all enemies.
Chaos Missile (Basic Attack): Basic Ranged Chaos attack on a single target. Chaos Damage is shield and armor-piercing and it cannot be dodged or parried. It ignores the five Elemental Resistances as well as Damage Reduction. But never scores a CRIT.
Demolishing Smash (Special Attack): Armor-Piercing and Shield-Piercing Melee Physical attack on target that Wounds target enemy. Starts Powered. 
Frost Katana (Special Attack): Armor-Piercing Melee Water attack on target enemy with splash damage, chance to apply Frostbite on all enemies hit.
Double Daggers (Basic Attack): Two Armor-Piercing Melee Physical attacks on target enemy with a 100% base chance to purge a buff
From the Shadows (Special Attack): Critical Armor-Piercing Melee Physical attack that purges 1 buff and grants self Evasion.
Impaling Barrage (Special Attack): 3 Armor-Piercing Melee Physical attacks on target enemy. If target dies, Astrid gains Haste.
Feet of Fury (Special Attack): 5 Armor-Piercing Melee Physical attacks on target enemy.
Infernal Blaze (Special Attack): Ranged Armor-Piercing Fire attack with 90% splash damage and a 100% base chance to inflict Demonfire Burn. When dealing a death blow, the corpse is removed.
Demolitionist (Trait): Attacks ignore Armor and deal 2x damage to Construct enemies.
Evasive Shot (Special Attack): Armor-Piercing Ranged Physical attack that grants self Evasion.
Sniper Shot (Special Attack): Critical Armor-Piercing Ranged Physical attack that purges 1 Buff.
Immunity
There is no known immunity.