Stable Ectoplasm

Source
This item drops from:
 * Torn Screamer in Eastern Plaguelands
 * Eyeless Watcher in Eastern Plaguelands
 * Death Singer in Eastern Plaguelands
 * Unseen Servant in Eastern Plaguelands
 * Hate Shrieker in Eastern Plaguelands

As a quest objective
This item is an objective of Hunting for Ectoplasm.