This item goes in the ARMS slot.
It was added in the The Shadows of Luclin expansion.
It can be used by the following classes: Cleric
The item is ranked #3 in slot for Cleric in The Shadows of Luclin.
The item is ranked #7 in slot for Cleric in The Planes of Power.
Link to Allakhazam: Karn's Armplates of Retaliation
