Find 50 War Bugles
"The horns the capital guards sound are lovely, and their call as clear and pure as a spring morn. I would have one of my own."
Gran Soren - Take any passageway to the battlements (the walls surrounding the city) and open all the chests.
The Encampment - Go to the tent that houses the Rift Stone, beside the "Innkeeper" in the front room will be a sack on the floor, this sack, once scavenged, will often give 3 or more War Bugles - check back periodically to raid it again.