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 15 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Underdweller's Spaulders Fits
Other Items Named Underdweller's Spaulders
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 78375 (78370 to 78380) were usually added in the same batch as Underdweller's Spaulders: the same quest line, zone, vendor or reward set.