Right Piece of Lord Valthalak's Amulet

The Right Piece of Lord Valthalak's Amulet twitches in your hand, demanding to be recombined with its brothers.

Source
This item drops from:
 * Isalien in Dire Maul
 * Mor Grayhoof in Blackrock Spire
 * Sothos in Stratholme
 * Kormok in Scholomance
 * Jarien in Stratholme

Right Piece of Lord Valthalak's Amulet as a quest objective
This item is an objective for the following quests: