Settings for DF

[Astromancer]

Originally Posted by Flyndaran

I like the post-apocalyptic idea.
Maybe the disaster was a demonic incursion that mortals barely won. But in some hidden areas small nascent portals still exist that must be destroyed lest the war start anew. These portals act as monster magnets.

Read up on the aftermath of the Black Death. That was very much a Medieval Post-Apocalyptic setting.