Unscarred Breastplate

Unscarred Breastplate is plate chest armor sought after by Warriors, Death Knights, and Protection or Retribution Paladins. For Warriors, this is a significant upgrade to the Zandalar chest, a small upgrade the Marshal chest, and roughly similar to the Conqueror's chest.

Source
This item drops from Quagmirran in The Slave Pens of Coilfang Reservoir.