This item is acquired in-game. See its sources below.
A Rare Leather Head, item level 44, binds when picked up.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
In the Appearances collection, Plaguebringer's Mask is listed as Quest. Appearance ID: 26588. 6 other items wear the same appearance:
Read from the World of Warcraft client build files.
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Plaguebringer's Mask suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Plaguebringer's Mask is part of the transmog set Haustvelt Leathers (Rogue, Monk, Druid and Demon Hunter only). The other 16 pieces:
Haustvelt Bindings
Haustvelt Boots
Haustvelt Britches
Haustvelt GlovesHaustvelt Hood
Haustvelt Jerkin
Haustvelt Shoulders
Haustvelt WaistbandDuskbat Exterminator's TreadsRunesworn CrownRunesworn BreechesThorignir Striker ShoulderguardsHumming Stormwing WrapMatriarch-Hide LegguardsEbon Stalker's BootsBoomer's Utility BeltBuilt from the World of Warcraft client build files and recorded Auction House snapshots.
Plaguebringer's Mask uses icon file 1115106, which 42 other items also use. The 6 closest by item ID:
Raging Worgen Hood ID 129347 · Armor - Leather · item level 44Gryphon Rider's Mask ID 129311 · Armor - Leather · item level 44Blighthound Master's Hood ID 129303 · Armor - Leather · item level 44Darkbane Visage ID 129063 · Armor - Leather · item level 44Drogstitch Cowl ID 130270 · Armor - Leather · item level 44Thick Bristly Hood ID 131761 · Armor - Leather · item level 44Blizzard numbers items as they are created, so the named items next to ID 129343 (129336 to 129348) were usually added in the same batch as Plaguebringer's Mask: the same quest line, zone, vendor or reward set.
Runesworn Bindings ID 129336 · Armor - Leather · item level 44
Stormborn Bracers ID 129337 · Armor - Mail · item level 44
Dreadsworn Wristguards ID 129338 · Armor - Plate · item level 44
Drape of the Undying Raider ID 129339 · Armor - Cloth · item level 44
Curseheart's Cowl ID 129342 · Armor - Cloth · item level 44
Dark Ranger Coif ID 129344 · Armor - Mail · item level 44
Blightcaller's Braincage ID 129345 · Armor - Plate · item level 44Stylish Gilnean Collar ID 129346 · Armor - Cloth · item level 44Raging Worgen Hood ID 129347 · Armor - Leather · item level 44Wall Watcher's Coif ID 129348 · Armor - Mail · item level 44The raw ItemSparse values for item 129343 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB