An agent of Thay sent to the Neverwinter region, Kallos Tam arrived with dark intentions. When he discovered the Blackdagger Bandits operating along the High Road near the ruins of Cragmire Keep, he saw an opportunity. Traven and Malus Blackdagger were receptive to his offer to help them unearth and control the undead army within the crypts.
Of course, Kallos Tam had no intention of putting the army fully at the command of the Blackdagger brothers. He intended to keep control of it himself, ensuring that he would hold the real power in the joint venture between himself and the Blackdagger brothers.