The Drowned Empire

An ancient maritime empire created anchor-mechanisms that let them raise and lower entire islands at will. They're long gone but the mechanisms still work. The party discovers an intact control station and the deed to a sunken island that would make them, technically, a sovereign nation — if they can raise it without killing everyone on the seafloor above.

Play this campaign right now with an AI Dungeon Master that narrates the world, voices every NPC, remembers your whole story, and asks for the rolls — solo or with friends.