Vyletongue Corruption (Horde) Fill the Coated Cerulean Vial at the orange crystal pool in Maraudon.
Use the Filled Cerulean Vial on the Vylestem Vines to force the corrupted Noxxious Scion to emerge.
Heal 8 plants by killing these Noxxious Scion, then return to Vark Battlescar in Shadowprey Village.
Silithus Alliance & Horde
Into The Maw of Madness - (Step 2) Commander Mar'alith at Cenarion Hold in Silithus wants you to find his beloved Natalia. The information that you gathered points to Hive'Regal in the south as being the area in which you may find Mistress Natalia Mar'alith.
Do not forget to visit the dwarves at Bronzebeard's camp before venturing into the hive. They might have some additional work and advice for you.
And [Name], remember the Commander's words: "Do what you must..."