The Black Wolf is a slaver who has sold people, children included, for over 20 years. He sold Yuna and Taka to the Mamushi brothers and now works with Altan. You hunt him on a ship in The Black Wolf, part of Yuna's Tales.
Jin and Yuna clear his camp and the ship. He begs for mercy and blames Altan, but Yuna knows he was trading people long before the Mongols came. He then taunts her about Taka.
Yuna kills him. Afterwards she tells Jin what he did to Taka as a child.