This item is acquired in-game. See its sources below.
A Rare Mail Head, item level 44, binds when picked up.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
In the Appearances collection, Thornbrace Helm is listed as Quest. Appearance ID: 26612. 18 other items wear the same appearance; 3 of them are listed here.
Read from the World of Warcraft client build files.
Mail is the armor type Evoker, Hunter and Shaman wear. With Agility or Intellect, Thornbrace Helm suits Beast Mastery, Marksmanship and Survival Hunter; Elemental, Enhancement and Restoration Shaman; Devastation, Preservation and Augmentation Evoker.
Thornbrace Helm 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 LeggingsThornbrace SpauldersThornbrace WaistguardThornbrace WristguardsShaladrassil CuirassBuilt from the World of Warcraft client build files and recorded Auction House snapshots.
Thornbrace Helm uses icon file 1116926, which 43 other items also use. The 8 closest by item ID:
Stormborn Crown ID 121508 · Armor - Mail · item level 44Whitewater Helmet ID 121666 · Armor - Mail · item level 44Seaspray Helm ID 121429 · Armor - Mail · item level 44Dreadroot Linked Helm ID 121209 · Armor - Mail · item level 44Valdisdall Helm ID 121154 · Armor - Mail · item level 44Hillstride Helm ID 121099 · Armor - Mail · item level 44Faronaar Chain Helm ID 121044 · Armor - Mail · item level 44Scale Helm of the Frigid Depths ID 129062 · Armor - Mail · item level 44Blizzard numbers items as they are created, so the named items next to ID 121587 (121582 to 121592) were usually added in the same batch as Thornbrace Helm: the same quest line, zone, vendor or reward set.
Rooksguard Gauntlets ID 121582 · Armor - Plate · item level 44
Nightvale Handwraps ID 121583 · Armor - Cloth · item level 44Thornbrace Gauntlets ID 121584 · Armor - Mail · item level 44
Rooksguard Helmet ID 121585 · Armor - Plate · item level 44
Nightvale Cowl ID 121586 · Armor - Cloth · item level 44
Sablehide Hood ID 121588 · Armor - Leather · item level 44
Rooksguard Legguards ID 121589 · Armor - Plate · item level 44
Nightvale Leggings ID 121590 · Armor - Cloth · item level 44Thornbrace Leggings ID 121591 · Armor - Mail · item level 44
Sablehide Breeches ID 121592 · Armor - Leather · item level 44The raw ItemSparse values for item 121587 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB