Shield-piercing - A shield-piercing attack ignores any magical shield like Aegis Shield, Ethereal, Unbridled Rage, as well as Damage Reflection Shields, Unbreakable Heart and Shrouded. In result an Aegis Shield doesn't collapse, Damage Reflection doesn't hurt the attacker, full damage is dealt to the target, and the target can die.
This instant effect has no visual component. Shield-Piercing attacks ignore the shield and deal full damage to the target.
Any debuff immunity provided by the shield still takes effect but the damage reduction and death ward is bypassed. All, and all kinds of shields (from Traits and active buffs) are pierced with a single Shield-Piercing attack.
Event Runes can have a Shield-Piercing bonus stat that adds the Shield-Piercing effect to Basic Attacks, and several Special Attacks of a few heroes are Shield-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.
Cataclysmic Conflagration (Special Attack): Sacrifices self, dealing shield-piercing damage to all enemies with 100% base chance to purge all buffs and add Soulfire Burn to enemies hit. Removes all enemy corpses. Can't be dodged.
Storm of the Ancestors (Special Attack): Shield-piercing ranged lightning attack on all enemies, consumes all stacks of Storm Power, dealing 10% more damage for each Stack of Storm Power. Adds a Buff to all allies that increases their damage to Shocked or Paralyzed targets.
Murky Shield (Special Attack): Shield-Piercing Ranged Dark attack that grants self Murky Shield, becoming Paralysis and Silence Immune for 3 turns. Enemies cannot Revenge while Murky Shield is activated.