This quest is not available in game.
Find Tyrande Whisperwind in Darnassus.
<name>, I am sure Tyrande Whisperwind herself would like to thank you for taking part in this mission.
It may not appear so on the surface, but what you've helped start could very well strengthen our foothold in the Stonetalon Mountains.
If you consider yourself our ally against these atrocities, go see Tyrande in the Temple of the Moon in Darnassus.