First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
Related
Stygian Guise Game Data
Appearance
In the Appearances collection, Stygian Guise is listed as Boss Drop. Appearance IDs: 40905, 40906, 40909, 40908. 5 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 Stygian Guise Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Stygian Guise 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
Stygian Guise is part of the transmog set Treacherous Schemer's Leathers (Rogue, Monk, Druid and Demon Hunter 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 174132 (174127 to 174137) were usually added in the same batch as Stygian Guise: the same quest line, zone, vendor or reward set.