Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Obsidian Arborweave Helm Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Obsidian Arborweave Helm 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
Obsidian Arborweave Helm is part of the transmog set Obsidian Arborweave Vestments (Druid only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Obsidian Arborweave Helm Fits
Other Items Named Obsidian Arborweave Helm
2 other items in the current build are also called Obsidian Arborweave Helm. 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 171749 (171744 to 171754) were usually added in the same batch as Obsidian Arborweave Helm: the same quest line, zone, vendor or reward set.