Mystic Yayo'jin at Revantusk Village in the Hinterlands wants you to kill 15 Vilebranch Scalpers and 10 Vilebranch Soothsayers. Return to her when this task is complete. Yayo'jin indicated that these trolls could be found near the Shaol'watha and Agol'watha temples in the north by northeastern region of the Hinterlands.
Three different tribes of trolls inhabit the Hinterlands, [player]. That is about as far as the similarities between the tribes extends: We are all trolls and we live in the Hinterlands.
The Vilebranch - aptly named - are a depraved lot; feeding on other trolls and humanoids.
If Zul'jin were here, he would have destroyed the whole lot of them with a flick of his wrist - alas, Zul'jin has not yet returned and we are left to our own devices.
It is up to you to destroy the filth of the region!