This WoW set features the full Onslaught transmog, which is the warrior tier 6 raid set. Onslaught is obtained by looting armor tokens from various Burning Crusade bosses. These tokens can be traded for set pieces via Shattrath City tier vendors. Note that, originally the tier 6 warrior set was only a six piece set, but later changed to include non-matching feet, wrist, and belt, as they still match other Sunwell Plateau raid gear. Matching non-set belt and feet are provided next to the sets below.
How to Get Warrior Tier 6? By slaying Hyjal Summit, Black Temple and Sunwell Plateau bosses.
Are There Multiple Tier 6 Transmogs For My Class? No, some classes do have multiple tier 6 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 6 set)
How Many Set Pieces?  Helmet, Shoulders, Chest, Bracer, Hands, Belt, Pants, and Feet.
Warrior Tier 6 Transmog: [Drop Locations]
Note: Warriors have two different sets with the same exact look. Tier 6 warrior armor tokens can be used to purchase any of the set pieces.
Head: Helm of the Forgotten Protector [Archimonde] in Hyjal Summit.
Chest: Chestguard of the Forgotten Protector [Illidan Stormrage] in Black Temple.
Wrist: Bracers of the Forgotten Protector [Sacrolash – Alythess] in Sunwell Plateau.
Hands: Gloves of the Forgotten Protector [Azgalor] in Hyjal Summit.
Waist: Belt of the Forgotten Protector [Brutallus – Alythess – Sacrolash] in Sunwell Plateau.
Legs: Leggings of the Forgotten Protector [Gathios – Malande – Veras] in Black Temple.
Feet: Boots of the Forgotten Protector [Felmyst – Sacrolash – Alythess] in Sunwell Plateau.
Vendor 1: Theremis [50,28] in Isle of Quel’Danas sells the [Waist, Wrist, Feet] Vendor 2: Tydormu in Hyjal Summit raid instance sells [Head, Shoulders, Chest, Hands, Legs]
Set Name: Onslaught Armor (hover for set bonuses)
Shoulder: Onslaught Shoulderguards
Chest: Onslaught Chestguard
Wrist: Onslaught Wristguards
Hands: Onslaught Handguards
Waist: Onslaught Waistguard [Transmog Alternative: Belt of Seething Fury] Legs: Onslaught Legguards
Feet: Onslaught Boots [Transmog Alternative: Myrmidon’s Treads]
Set Name: Onslaught Battlegear (hover for set bonuses)
Shoulder: Onslaught Shoulderblades
Chest: Onslaught Breastplate
Wrist: Onslaught Bracers
Hands: Onslaught Gauntlets
Waist: Onslaught Belt [Transmog Alternative: Belt of Seething Fury] Legs: Onslaught Greaves
Feet: Onslaught Treads [Transmog Alternative: Myrmidon’s Treads]