Rina Moonspring wants you to take her Diminution Powder and apply it to 5 of the Bloodmaul Dire Wolves, which can be found at Bloodmaul Outpost and in Bloodmaul Ravine. After doing so, return to her at Sylvanaar in the Blade's Edge Mountains.
5x Bloodmaul Dire Wolf weakened
With their wolf pack reduced, the Horde is looking for replacements. Unfortunately there's another source nearby.
The Bloodmaul ogres in the ravine below to the east keep a strong pack as their own sentries. I hated sending you to kill the Thunderlord wolves, so why don't we do something different this time?
I've derived a magic powder from the dust that naturally falls off the wings of our fey drakes. Sprinkle it on the Bloodmaul dire wolves to make them undesirable to the Horde.