This WoW set features the full Valorous Kirin’dor transmog, which is the mage tier 8 (10-man) raid set. Kirin’dor is obtained by looting tokens from Ulduar and trading those tokens in for set pieces via Dalaran tier vendors.
How to Get Mage Tier 8? By slaying Wrath of the Lich King Ulduar bosses.
How Many Set Pieces?  Helmet, Shoulders, Chest, Hands, and Pants
Mage Tier 8 Transmog: [10-Man Drop Locations]
Head: Helm of the Wayward Vanquisher [Mimiron ] in Ulduar.
Chest: Chestguard of the Wayward Vanquisher [Yogg-Saron] in Ulduar.
Hands: Gloves of the Wayward Vanquisher [Freya] in Ulduar.
Legs: Leggings of the Wayward Vanquisher [Hodir] in Ulduar.
Redeem Token Vendor: Paldesse [43,49] in Dalaran.
Set Name: Valorous Kirin’dor Garb (hover for set bonuses)
Shoulder: Valorous Kirin Tor Shoulderpads
Chest: Valorous Kirin Tor Tunic
Hands: Valorous Kirin Tor Gauntlets
Legs: Valorous Kirin Tor Leggings
Optional: Hands and Legs low droprate from [Emalon the Storm Watcher] in Vault of Archavon.