In the Appearances collection, Lightning Emperor's Mantle is listed as Vendor. Appearance ID: 19945. 14 other items wear the same appearance; 9 of them are listed here.
Read from the World of Warcraft client build files.
How Lightning Emperor's Mantle Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Lightning Emperor's Mantle suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Lightning Emperor's Mantle Fits
Other Items Named Lightning Emperor's Mantle
4 other items in the current build are also called Lightning Emperor's Mantle. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 96663 (96658 to 96668) were usually added in the same batch as Lightning Emperor's Mantle: the same quest line, zone, vendor or reward set.