Quote:
Originally Posted by AlexanderHowl
Well, you would need around 1000 cubic kilometers of material (2-4 trillion metric tons) to block out the sun to any significant degree (a VEI 8 volcanic eruption would be suitable, though the last one occurred 26,500 years ago, and it only caused a year of darkness and a decade of twilight). Your best bet would be to have the vampires be vulnerable to UV light rather than Sunlight (a Common Weakness versus a Very Common Weakness) and have them continuously spray kilotons of sulfuric acid into the upper atmosphere every year to prevent UV light from reaching the surface of the Earth (perhaps it was a geoengineering scheme to reverse global warming that the vampires took over to create the world that they wanted). It would also reduce surface temperatures by 5 Kelvin, which would cause an Ice Age, but I imagine that the majority of vampires would not care. Of course, this is assuming that you care about a pseudo-scientific explanation for the events that led to the End.
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I think we're less than fully concerned with it being in some way hard-science viable. Firestorms caused by fuel-air bombing of population centers is traumatic enough that we could call it enough, although we've talked about some way of triggering a volcano.