This item can be looted from most level 31-52 Humanoid monsters.
Green Hills of Stranglethorn - Page 20 as a quest objective
"We set out at first light, heading south past the Tkashi Ruins. Barnil voiced concern that we might encounter members of the Bloodscalp Tribe. I reminded Barnil that the Bloodscalps were more concerned with destroying their tribal enemy, the Skullsplitters. Needless to say, Barnil was not comforted in the least. I, however, had a loaded rifle, a satchel full of gunpowder and three deadly hunters with me to ease any concerns of an unfriendly ambush."