This quest is not available in game.
Speak with Magatha in Thunder Bluff.
To truly tend the spirits of Stonetalon we must consult the tauren elders.
I do not know many of their leaders' names, but I do know of one: Magatha. I have heard that she is very old, and she knows much. If anyone can marshal spiritual aid from the tauren, it is she.
Magatha resides in the tauren capital of Thunder Bluff, on Elder Rise -- the city's northeastern bluff. Speak with Magatha, and tell her of the peril of Stonetalon Mountains.