Are they friends, or foes?Possible theories1>future humans with time travelThis makes sense, because who would be most interested in humans? Future humans.2>underground civilization - they're grey because they live under the earth with no sunlightMaybe a competing civilization, anti-gravity tech would work in giant caverns and underwater just as it would in space3>they're from a distant planet - they're grey because they spend all their time inside spaceshipsPlausible. Most common theory on /x/4>other - they're biological robots that are remote controlled by an AIThis is one theory I don't see talked about enough. If an AI wanted to physically interact with the real world, this would be one way to do it. perhaps they are controlled by an AI that was created by a now dead civilization.5>muh demonsI don't think demons need metal craft in order to fly...
>>42391773>I don't think demons need metal craft in order to fly...Depends. If a demon is merely an evil spirit, sure, that would make sense, but what if they have been demoted to the physical realm just like Lucifer is in the book of Revelation and thus need to get around like everybody else?
>>42391773ever played D&D?
>>42391773They are future humans who fucked around too much with the genes and can't reproduce organically anymore.So now they tunnel back to collect fresh DNAs in the hope that will solve their problem.
>>42391793this, they're fey.wee fair-skinned folk that can muddle the mind and spirit people away.>no pointy earspointy ears on elves is a 19th century invention, same as fey having butterfly wings.