From the introduction:
The wizard Ridomenus placed her tomb in the sky as a testament to Seree power. Upon her death, a magical barge carried her to her final resting place high in the air.
This was long ago, and few still know the meaning of the “black lantern” that hangs in the sky over the bay - not least because the entire land of Wyv has fallen to the flying serpents.
Those who dare its shores, however, might spot a black speck racing along the waterline, for Radomenus’ funeral barge never stopped, endlessly making its final tour.