This WoW set features the full Valorous Earthshatter transmog, which is the shaman tier 7.5 (25-man) raid set. Earthshatter is obtained by looting Wrath of the Lich King bosses and purchasing some set pieces straight from the vendor with gold. Dropped tokens can be traded for set pieces via Dalaran tier vendors.
How to Get Shaman Tier 7.5? By purchasing from vendors and slaying Naxxramas/Obsidian Sanctum bosses.
How Many Set Pieces?  Helmet, Shoulders, Chest, Hands, and Pants
Shaman Tier 7.5 Transmog: [25-Man Drop Locations]
Note: Shamans have three different sets with the same exact look. Tier 7.5 shaman armor tokens can be used to purchase any of the set pieces.
Head: Crown of the Lost Protector [Kel’Thuzad] in Naxxramas
Chest: Breastplate of the Lost Protector [Gluth] in Naxxramas
Hands: Gauntlets of the Lost Protector [Sartharion] in The Obsidian Sanctum
Legs: Legplates of the Lost Protector [Purchase from Vendor] in Dalaran.
Shoulder/Leg Vendor (Alliance): Arcanist Ivrenne [37,55] in Dalaran.
Shoulder/Leg Vendor (Horde): Magistrix Lambriesse [65,23] in Dalaran.
Redeem Token Vendor (Both): Bragund Brightlink [51,72] in Dalaran.
Set Name: Valorous Earthshatter Battlegear (hover for set bonuses)
Shoulder: Valorous Earthshatter Shoulderguards
Chest: Valorous Earthshatter Chestguard
Hands: Valorous Earthshatter Grips
Legs: Valorous Earthshatter War-Kilt
Set Name: Valorous Earthshatter Garb (hover for set bonuses)
Shoulder: Valorous Earthshatter Shoulderpads
Chest: Valorous Earthshatter Hauberk
Hands: Valorous Earthshatter Gloves
Legs: Valorous Earthshatter Kilt