Hardened Shell

Hardened Shell is an item that can be used to dismount targets.

Source
This item drops from the pandarian champion Nessos the Oracle in Kun-Lai Summit. Additionally, Chelon and Great Turtle Furyshell on the Timeless Shore of Timeless Isle may drop it as well.

Trivia
This item is a reference to the Blue Shell from the  video games.

Achievements

 * Going To Need A Bigger Bag