This quest is not available in game.
Bring the head of Chief Sharptusk Thornmantle to Brave Windfeather in Red Cloud Mesa.
<name> - I have heard of you, newcomer. Perhaps it is you that will help us, where others have failed.
We tauren have carved a home out of this land, but not without a cost. The Bristleback quilboars of Brambleblade Ravine, led by Chief Sharptusk Thornmantle, have made our lives difficult with their continued war against us. I charge you to bring me the chief's head!
He will be found in the ravine to the east in their makeshift village.