Borean Hollows

The borean hollows is a sector of the Sky made up of tunnels and caverns within an astronomical sphere of ice. Paths run through it, which and thus make it navigable. In some areas the paths are the only light source, whereas others are illuminated by small, comparatively cold stars, or a phenomenon akin to auroras on magnetic planets. Some areas again are entirely dark, which makes them difficult to sail through. The walls of the hollows exhibit divergent gravitational pull, and are thus habitable, to the extent that a frigid desert of ica can be described as such.