The shattered isles have wildly different climates due to magical forces left over from the cataclysm. The “water” of the Void Sea seems to be composed of opaque black ink, but it's possible to see constellations of shimmering stars far below the surface. The sun is a dim ember, providing only meager twilight at dawn and dusk; leaving the world in darkness otherwise. This was once a storybook fantasy world of magic and wonders, which was destroyed and an industrial civilization was built on top of the ruins. Don't expect scientific realism here.