Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Mantle of Nefarius Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Mantle of Nefarius suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Mantle of Nefarius is part of the transmog set Mercurial Regalia (Priest only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Mantle of Nefarius Fits
Other Items Named Mantle of Nefarius
2 other items in the current build are also called Mantle of Nefarius. 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 59337 (59332 to 59344) were usually added in the same batch as Mantle of Nefarius: the same quest line, zone, vendor or reward set.