Piercing Damage
"Piercing Damage is not reduced by the target's armor"
- Artifact Tooltip
Piercing damage is a damage type in Artifact
Piercing damage ignores all

Pierce[edit]
"Battle damage dealt by this unit is Piercing. Piercing damage is not reduced by the target's armor"
- Artifact Tooltip
Some cards use the Pierce Keyword instead, with the only difference being that it modifies the battle damage type of a unit instead of being one instance of damage.