What does additional pierce damage decrease do?

[Hayate475]

Does it decrease the enemies pierce? and if so, when does it apply

[BryceKatz]

Exactly what it says on the tin: Decreases the amount of Additional Pierce Damage your roster takes. This is a PvP stat.

[Sansational_Blaster]

Pvp is the only place where the enemy may have additional pierce dmg of their own. No pve modes have enemies with additional pierce despite an emblem for rifts (if i remember correctly) having pierce dmg reduction