Droplet of Y'Shaarj

Source
This item drops from the Sha of Pride in the Siege of Orgrimmar on Normal difficulty or higher.

It can also be listed on the Black Market Auction House by Madam Goya, for the opening bid of.

Pet Journal
A small remnant of the power of Y'shaarj that spawned the Sha, a single Drop of Y'shaarj can magnify emotional states for thousands of yards, causing entire towns to shut down in fear or doubt.