The Seafloor Citadel: The Denizens' Subterranean Shelter
The Seafloor Citadel itself is a feat of subterranean engineering by Larimar, Baya, and Ne'las. Its metallic hull is thick and sturdy, and its exposed, multi-layered glass dome at its highest point - which sticks out of the seafloor in the Glass Trench - is well-built with the pressure of the deep ocean's waters in mind.
The citadel was built with keeping the Wraiths contained, preventing them from further destroying the outside world. Keeping them contained meant the denizens would have the time and space to create sealing artifacts in which to keep the Wraiths trapped without constant maintenance of a containment facility, meaning they could remain contained long after the citadel became abandoned.
At its center is the Castle, a large dome housing many of the shared facilities that every denizen uses. The food gardens, the library, the infirmary, the recreation areas, and more. It also houses a control center that manages the citadel's amenities, including the ventilation, water filtration, irrigation, and power distribution.
Surrounding the Castle are the Abodes, dormitories close to exit routes meant to house every denizen. The Citadel has six two-person Abodes, four three-person Abodes, and two four-person Abodes, making a total of twelve. Some denizens move back and forth between Abodes as they are part of more than one group, such as Hack part of both the Lethal Ladies and the Triplet Spirits.
Up a staircase south of the Castle is the citadel's namesake, the dome that sticks out of the seafloor. Its glass structure and set of lights provide a view out to a deep-sea coral reef. Some denizens sit here to write logs in their journals on the daily, as they typically go unbothered since this area is rarely crowded - aside from when meetings occur, of course.
The exit routes that the Abodes are built around all funnel into a hub that branches out into minecart tunnels toward various underground locations, as well as an elevator to go directly to the surface. In the present day, all points of egress aside from the elevator to the surface are blocked off due to collapses and cave-ins, rendering them impossible to enter unless found within all the rubble and cleared.
The denizens who originally lived at the citadel were Larimar, Ne'las, Camryn, Baya, the Lethal Ladies, and Kaiya. They all contributed to sealing the Wraiths there, before ultimately dying inside it as they all suffered from cursed wounds dealt by the Wraiths themselves. Larimar, the last one to die, sat in the glass dome with the sealing artifacts beside him - it was lights out moments after he finished writing his final log.
