The Great Devourer was a shield for the Vanguard class in Nosgoth. It was an alternative to the default Hybrid Tower.
The Great Devourer was described as "the skull of a giant predatory beast, unearthed on a distant battlefield and now armoured for use in the war for Nosgoth."[NOS]
The alternatives to The Great Devourer were:
All shield variations, like skins, were vanity items without unique functionality.
The Great Devourer is referred to as "VanityItem_ShieldHuman_Premium_2" in the Nosgoth game data.