Hudson River Spirit

The Hudson River spirit is the spirit of the Hudson River. He dislikes Percy and The East River spirit.

The Last Olympian
Percy asks him to sink all of the Titan ships that come in his river, in exchange for the Sand dollar his father, Poseidon, gave him for his fifteenth birthday. After both spirits agree, Percy splits the sand dollar between the East River and The Hudson River. Holding their side of the bargain, both river spirits stop the ships from crossing.