The game's collection data lists Mantle of Soft Shadows as sold by a vendor NPC in Grizzly Hills. The vendor stands at 65.4, 48.0 on the Grizzly Hills map.
Vendor NPC, zone and position come from the client's collection source tables (CollectableSourceInfo and CollectableSourceVendorSparse); coordinates are the in-game map readout.
Build history
First seen in build 5.5.4.69585 (Mists of Pandaria).
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Mantle of Soft Shadows Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Mantle of Soft Shadows suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Transmog Sets
Mantle of Soft Shadows is part of the transmog set Restless Dreambound Battlegear (Rogue, Monk, Druid and Demon Hunter only). The other 16 pieces:
1 other item in the current build is also called Mantle of Soft Shadows. 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 57866 (57861 to 57871) were usually added in the same batch as Mantle of Soft Shadows: the same quest line, zone, vendor or reward set.