This WoW set features the full Warbringer Transmog, which is the warrior tier 4 raid set. Warbringer is obtained by looting armor tokens from various Burning Crusade bosses. These Tokens can be traded for set pieces via Arodis Sunblade (Scryers) or Asuur (Aldor) located within Shattrath City.
How to Get Warrior Tier 4? By slaying Karazhan, Gruul’s Lair, and Magtheridon’s Lair bosses.
Are There Multiple Tier 4 Transmogs For My Class? No, some classes do have multiple tier 4 sets (depending on their class trees), but every tier set variation features the same exact transmog look. For example, the paladin has a different set for retribution, holy, and protection, but all three sets share the same exact model and color variation. (Hunter, Mage, Rogue, and Warlock feature only one tier 4 set)
How Many Set Pieces?  Helmet, Shoulders, Chest, Hands, and Pants
Warrior Tier 4 Transmog:
Note: Warriors have two different sets with the same exact look. Tier 4 warrior armor tokens can be used to purchase any of the set pieces.
Head: Helm of the Fallen Defender by slaying Prince Malchezaar in Karazhan.
Chest: Chestguard of the Fallen Defender by slaying Magtheridon in Magtheridon’s Lair.
Hands: Gloves of the Fallen Defender by slaying The Curator in Karazhan.
Legs: Leggings of the Fallen Defender by slaying Gruul the Dragonkiller in Gruul’s Lair.
Head: Warbringer Greathelm
Chest: Warbringer Chestguard
Hands: Warbringer Handguards
Legs: Warbringer Legguards