Flash Bomb

Flash Bomb causes all beasts to flee from the user. It can be used on any mob labeled as a beast, as well as hunter's pets, Druids, when they are in an animal form, and Shamans in Ghost Wolf.

Source
This item is created with Engineering (185); taught by Schematic: Flash Bomb, a very rare drop from Mekgineer Thermaplugg in Gnomeregan.

This item was also a quest reward from Pearl Diving.

In the RPG
Developed by dwarven law enforcement as a safe way to stun and disorient thieves for easy apprehension, the flash bomb looks much like a standard grenade except for its compact, oval shape. When thrown, it explodes with a bright flash and loud bang.