Elemental Plane of Water

The Berg is a complex of caves on the underside of the great ice platform. The merfolk don't so much live in the City of Glass as swim around it. Having no feet, only tails, they can't negotiate its streets. The city itself is like a dream to the merfolk: Though they can see it, it's always out of reach. The Berg is really just an aquatic slum filled with unfortunates who have no place under the gleaming dome. Their caves, enlarged with the aid of mottled worms, tend to be cylindrical and are sparsely furnished with shells, living seaweed, and various corals. They're chill even for creatures accustomed to arctic waters. The merfolk are truly the underclass in the City of Glass; few of the many aquatic beings who live in the city ever visit their caves. Their primary jobs are to clean the dome of algae and barnacles and dispose of the city's waste. The rest of the citizens take these services for granted, not realizing how quickly the city would degenerate without them