The space part of the pack is based on an old DnD campaign I was in where the whole solar system was breathable and accessible without the need for advanced technology. i.e basically medieval steampunk. The planets and moons are inspired by old scifi stories before modern observations. eg. Venus is a jungle/swamp planet, Mars either has or had intelligent life underground, space carp under the ice of europa, a moon orbiting a gas giant that manages to sustain life via volcanic vents providing warmth far from the sun etc. There is A LOT more to it but this is what the player can expect after killing the enderdragon allows the elytra to be obtained.