This quest is not available in game.
Kill Grundig Darkcloud and 6 Grimtotem Brutes, and return to Makaba Flathoof near the southeastern edge of Stonetalon.
<name>, you've done a fine job killing Grimtotem. If you dare, Grundig Darkcloud and his personal band of brutes is by far the worst of the lot. He was the one who led the brutal attack on my village.
You will find him in Grimtotem Post a bit further up the path to the west. Kill him, and I will be forever grateful.