Cavity is a planet that has long since run out of resources. Full of holes and cracks, the ground is incredibly unstable and slowly the exterior of the planet is caving in on itself. The sky of this planet is always dark, and despite its hot appearance (it's mostly made up of different kinds of ultisols, and a very high concentration of iron oxide) it's actually fairly cold here, nearly all heat originates from geysers. Cavity is the home planet of the world thieving Nervemites, and it's where Nervemites are born with the intent of making sure only the strongest members survive. Queen variants make massive sack like nests between the spires, and such is where she'll stay and lay her eggs.