Beelzebub Palace

Beelzebub Palace is a structure levitating above the Ousto Sea. Named after a prince of hell from the time of the ancient gods, it was sunk during the War of the Three Gods, but resurfaced after Louie Marshrun slew Bureado Casserly in the deepest reaches of the Bureado Labyrinth.
Its sudden resurfacing caused a tsunami which damaged coastal villages along the Ousto Sea.
Beelzebub Palace is the power source of the Bureado Labyrinth which runs under most of the Resperent region. Thus whoever controls it can be said to hold the destiny of Resperent in their hands.