The castle possesses other rooms where each of the generals and members reside when they're not being used by Zahab, as well as rooms and doors for watching over the maintenance of the Demon-Beast. Likewise, the castle has the ability of flight to be able to escape from a Demon-Beast, as well as buoyancy to float on the ocean when waiting for a new steed to be formed.Chapter 42: The Horrible Demon-Beast