First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
Related
Fathom-Feeder's Mantle Game Data
Appearance
In the Appearances collection, Fathom-Feeder's Mantle is listed as Boss Drop. Appearance IDs: 40098, 40081, 40143, 40126. 2 other items wear the same appearance:
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Fathom-Feeder's Mantle Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Fathom-Feeder's Mantle suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Similar Items
The 6 items nearest to Fathom-Feeder's Mantle (item level 72) in item level among Armor > Cloth, Shoulder slot, from item level 58 to 78.
Fathom-Feeder's Mantle is part of the transmog set Frilled Harbinger's Vestments (Priest, Mage and Warlock only), which the Appearances collection lists in 4 versions. The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 168342 (168337 to 168348) were usually added in the same batch as Fathom-Feeder's Mantle: the same quest line, zone, vendor or reward set.