This item is acquired in-game. See its sources below.
Appearance ID: 26612. 18 other items wear the same appearance; 4 of them are listed here.
Read from the World of Warcraft client build files.
Dreadthorn Helmet is part of the transmog set Dreadthorn Battlegear (Hunter, Shaman and Evoker only). The other 16 pieces:
Dreadroot Linked Belt
Dreadroot Linked Bracers
Dreadroot Linked Gauntlets
Dreadroot Linked GreavesDreadroot Linked Helm
Dreadroot Linked Legguards
Dreadroot Linked Spaulders
Dreadroot Linked VestThornbrace ChainmailThornbrace SabatonsThornbrace GauntletsThornbrace HelmThornbrace LeggingsThornbrace SpauldersThornbrace WaistguardThornbrace WristguardsBuilt from the World of Warcraft client build files and recorded Auction House snapshots.
Dreadthorn Helmet is not traded on the Auction House, so it has no Auction House price. It is acquired in-game from the sources listed above. This page collects its first-party game data (identity, effects and where it comes from) from the official World of Warcraft client build.
TheWoWDB