For writing class, I'm trying my hand at a fantasy short story, starring a country's armed forces holding the line against shadow horrors while the civilians evacuate. I don't know whether the idea is worthy of expansion or what it would feature besides combat, nightmares, and people attempting to cope. I think it's a worthwhile exercise, though. Just like science fiction, there's world-building and infilling. The suspension of disbelief can be pretty delicate- can I convince you that there are horrible monsters coming from the south magnetic pole to ravage humanity and destroying what's in their paths? Would you believe that the people living closest to the pole have a mix of customs not seen in our world? Is using arquebuses with female representation in the army too much of a stretch? The science fiction I write is about predictions for our world, the fantasy about less likely possibilities for any world.