Message in a Bottle - (Step 2) Slay King Mukla and return to Princess Poobah with the Key to free her.
Silithus Alliance & Horde
Dearest Natalia - (Step 1) Commander Mar'alith at Cenarion Hold in Silithus wants you to question the inhabitants of Bronzebeard's Encampment. You will find Bronzebeard's Encampment south of Cenarion Hold.
Once you have gathered the requested information, return to Commander Mar'alith.