The Steel Sentinel

The Steel Sentinel is the second boss of the Hall of Explorers wing in the League of Explorers adventure of Hearthstone. It is the armor of Anduin Lothar, recovered by Brann Bronzebeard from Blackrock Mountain, which has been animated by Arch-Thief Rafaam and the Staff of Origination. According to Brann, it cost him months of sifting through dragon dung to recover the armor.

Speculation
Behind Krom Stoutarm, in the Library of the Hall of Explorers, is a footman armor on a rack. While incomplete it features the same pauldrons as the Steel Sentinel and may be intended to represent it.