Item
Raid: Ulduar WotLK – Boss: Flame Leviathan
Raid: The Emerald Nightmare Heroic Legion – Boss: Cenarius (Spoils of the Nightmare)
Raid: Magtheridon’s Lair BC – Boss: Magtheridon (Token)
From Shadowmourne Quest Line in Icecrown Citadel
Raid: The Emerald Nightmare Heroic Legion – Boss: Ysondre
Also a Random Zone Drop in Emerald Nightmare: Gauntlets of Fractured Dreams
Raid: The Emerald Nightmare Heroic Legion – Boss: Nythendra
PvP: Legion Season 1 
Alliance only
Horde players have to use another pair of legs.
Raid: Karazhan BC – Boss: Nightbane
Raid: Blackrock Foundry Heroic WoD – Boss: Hans’gar & Franzok
Raid: Blackrock Foundry Heroic WoD – Boss: Hans’gar & Franzok