Katamba
From Play.net:
Katamba is the largest of the three moons and figures most prominently in the mythology of the provinces. Historians say that Katamba shone with golden light in ancient times, but that it was burnt by the breath of the World Dragon. Katamba's surface -- black as soot and encircled by a faint, miasmatic atmosphere -- lends credence to the tale. Due to its mass, Katamba dominates the tides of Elanthia. While Xibar and Yavash also influence the movement of the oceans, sailors the world over have learned to look to Katamba first.
Moon Mages ascribe to Katamba dominance over Moonlight Manipulation magic as well as influence over Perception and Transduction magic. Astrologers also claim that Katamba is not merely a dark moon, but that it emits shadows in the same way that the other moons emit light.