They are hunters of the house of Vanderberg. They wield a shotgun that fires three slugs at your minions. They evade your minions by rolling away from you minions.
They are first encountered in Karlshaven, Fish market near the rectangular building. If you choose to go North, he will be in the southeast of the building and if you go East, he will be in the northeast of the building. Similar building is seen in the map.