This item is acquired in-game. See its sources below.
In the Appearances collection, Tranquillien Defender's Girdle is listed as Vendor. Appearance ID: 494. 18 other items wear the same appearance; 12 of them are listed here.
Read from the World of Warcraft client build files.
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Tranquillien Defender's Girdle suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Tranquillien Defender's Girdle uses icon file 132492, which 195 other items also use. The 8 closest by item ID:
Rusted Plate Girdle ID 28143 · Armor - Plate · item level 8Farstrider's Belt ID 28142 · Armor - Leather · item level 8Stillwater Girdle ID 27835 · Armor - Mail · item level 32Malefic Girdle ID 28654 · Armor - Cloth · item level 32Belt of Divine Inspiration ID 28799 · Armor - Cloth · item level 32Belt of Depravity ID 29241 · Armor - Cloth · item level 32Sash of Arcane Visions ID 29257 · Armor - Cloth · item level 32Netherstrike Belt ID 29520 · Armor - Mail · item level 32Blizzard numbers items as they are created, so the named items next to ID 28162 (28157 to 28168) were usually added in the same batch as Tranquillien Defender's Girdle: the same quest line, zone, vendor or reward set.
Black Leather Jerkin ID 28157 · Armor - Leather · item level 9
Batskin Belt ID 28158 · Armor - Leather · item level 10
Undertaker's Gloves ID 28159 · Armor - Leather · item level 10
An'telas Plate Shirt ID 28160 · Armor - Plate · item level 9
Tranquillien Plate Leggings ID 28161 · Armor - Plate · item level 9
Maltendis' Handguards ID 28163 · Armor - Plate · item level 10
Tranquillien Flamberge ID 28164 · Weapon - Two-Handed Sword · item level 8
Shield of the Void ID 28166 · Armor - Shield · item level 31
Sha'tari Wrought Armguards ID 28167 · Armor - Plate · item level 32
Insignia of the Mag'hari Hero ID 28168 · Armor · item level 31The raw ItemSparse values for item 28162 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
Tranquillien Defender's Girdle 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