Who is Dwarf from Stories: All-New Tales and what is their importance?

A dwarf arrives at the residence of Calum MacInnes and asks that he guide him to the cave on the Misty Isle. The man, formerly a reaver, agrees and they leave immediately. The dwarf is the size of a child, but much stronger, and much faster. He tells Calum that he seeks the gold within the cave to bring the King across the water to rule and bring about a land of prosperity and joy. In truth, he is but an honest man seeking to bring about the vengeance due for the death of his daughter, killed by Calum when Calum was just a young man.