Snehk's Dreamlands

I incubated this unintentionally, while playing Dwarf Fortress yesterday.

In my dream, I was playing Dwarf Fortress in the fortress mode. I was an overseer in gigantic settlement. It was built deep underground in the granite layer. Each wall and floor tile was smoothed out. For a while I observed dwarves, ignorant of perilous danger. And then I saw gigantic beast tearing apart any dwarf who would cross its path. Dwarves were trying to fight it off, but to no avail. Suddenly it died of old age, leaving only two of them alive. They were rebuilding their fortress, unaware of the horrors that would bring them next overseer, a creature of the night.