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do ya''ll not know about the dwarven space mod? its a questline to gather aetherial shards and you get this ship to work in a mountain near falkreath, you get it working and you can travel to one of the moons of nirn, but thats it, there are no quests on so called moons, as of yet anyway, hoping that mod goes a lot further :) here is a link to the mod if you would like to use it http://skyrim.nexusmods.com/mods/23260

i actually like your idea, but to make your idea sound better, how about being able to control the dream, like a dream quest, no you can't change anything in the dream, it would be cool to see randomated quests tieing to what you said with nightmares, or living like kings, and also have like a dream world stash, so only the things you find in dream realm stay in dream realm, if you finish the dream without dropping the stuff in the chest then you lose it. sounds like it could be a good idea