Item
Raid: The Nighthold Heroic Legion – Boss: Elisande
Drop from Rare Elite NPCs in Zone: Krokuun Legion
Sold by Captive Wyrmtongue in Stormwind and Orgrimmar for 50 Nethershards
Raid: The Nighthold Heroic Legion – Boss: Gul’dan
Raid: The Emerald Nightmare Heroic Legion – Boss: Ursoc
Raid: The Nighthold Heroic Legion – Boss: Tichondrius
Quest Reward: 
The Slithering Darkness in the Storm Peaks WotLK
Raid: Mogu’shan Vaults MoP – Boss: Gara’jal the Spiritbinder
Quest Reward from the Proving Grounds:
Illusion: Mongoose
Quest Reward from the Proving Grounds:
Illusion: Mongoose