The game's collection data lists Underdweller's Spaulders as sold by 2 vendor NPCs in Townlong Steppes and Isle of Thunder. The first vendor stands at 38.0, 64.6 on the Townlong Steppes 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 Underdweller's Spaulders Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Underdweller's Spaulders 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
Underdweller's Spaulders is part of the transmog set Blackfang Battleweave (Rogue only). The other 16 pieces:
2 other items in the current build are also called Underdweller's Spaulders. 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 77271 (77266 to 77281) were usually added in the same batch as Underdweller's Spaulders: the same quest line, zone, vendor or reward set.