Osseous Agitator

Source
This item drops from:
 * Skeletal Executioner in Western Plaguelands
 * Skeletal Warlord in Western Plaguelands
 * Wandering Skeleton in Western Plaguelands
 * Skeletal Sorcerer in Western Plaguelands
 * Skeletal Acolyte in Western Plaguelands
 * Skeletal Flayer in Western Plaguelands
 * Skeletal Terror in Western Plaguelands
 * Cauldron Lord Razarch in Western Plaguelands
 * Cauldron Lord Malvinious in Western Plaguelands
 * Araj the Summoner in Western Plaguelands

Osseous Agitator as a Quest Objective

 * used at the Scourge Cauldron on the Felstone Field in the Western Plaguelands.