Middle of Gelkak's Key

The Middle of Gelkak's Key dropped from the following murlocs in Darkshore:
 * Greymist Hunter
 * Greymist Oracle
 * Greymist Raider
 * Greymist Coastrunner
 * Greymist Netter
 * Greymist Seer
 * Greymist Warrior
 * Greymist Tidehunter
 * Murkdeep

As a quest objective

 * Gyromast's Retrieval