Alright, I've got some actual, legitimate, important work for you. We've got to call the kodos in from the grazing lands to the south. General Thorg'izog says we'll be moving out into Redrige soon, and I won't be caught with my kodos down.
Use this horn near a kodo. It will return to the camp when it hears the call.
You'll want to watch out. Sometimes the kodos get a little fiesty, so you need to knock them around a bit before they listen to you.
Your job is complete. You take a look at the horn that they gave you, and decide to hang onto it for a while longer.
Back to the south. If they turn hostile, knock them down to below 75% of their health. The quest completes automatically once seven have returned, and the followup, [15-30] Taking the Horn For Ourselves is automatically offered next.