Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Helm of the Mountain Recluse Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Helm of the Mountain Recluse 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
Helm of the Mountain Recluse is part of the transmog set Vestment of Second Sight (Demon Hunter only). The other 16 pieces:
Items Numbered Next to Helm of the Mountain Recluse
Blizzard numbers items as they are created, so the named items next to ID 141418 (141413 to 141423) were usually added in the same batch as Helm of the Mountain Recluse: the same quest line, zone, vendor or reward set.