Minecraft wiki entry for Sky_dimension, associated text: In Java Edition 1.13, it is possible to partially recreate the Sky Dimension through the Buffet world type. This is done by choosing the "Floating Islands" World Generation option and picking any Overworld biome (any type of Forest, Plains, Swamp, or Jungle) as the World Terrain option. This creates a partial recreation of what the Sky dimension might have looked like.