Floating Castle

Powered by steam and dragon fire, this castle spans 7 floors, complete with library, furnace room, throne room, machine room, servants quarters, rooftop, and even a cannon room! Are the players guests? Or interlopers? Are they trying to convince the dragon to stop powering the boilers? And is the dragon there willingly? Are the various rooms unlocked? Or will the players need to steal keys from the guards or servants? What kind of trouble can the party get into when they are flying in a steam-powered castle, high above the earth?