[quote=bluejay_gl]
I think a supernatural source would be more exciting. Vampires who want a permanent way to avoid turning into ashes from daylight? (Though I believe this was a storyline in Skyrim: Dawnguard.) Or a demon who wants to create another dimension of hell, using the Earth as a preexisting "clay" to form it?And honestly, a sci-fi would be pretty difficult to pull off. For one thing, if the sun was blotted out, every living thing would freeze to death, so you'd have to come up with a reason why that doesn't happen.
[/quote]Yeah, I'm feeling supernatural. If it were to be a demon, perhaps a higher ranking demon whom needs darkness to birth and nourish its spawn? That would also work with another dimension of hell. That's true and I'm not very good at scientific explanations.