>>43289367In one setting I'm working on, the Dark Necro-Lord of Badness actually got off his Ritual of Destroying Everything, Yes, Even Me. Except there was this one genius and his sidekicks in a big industrial city working on a device that would allow them to reshape reality (they're not the most altruistic of folks either, but at least they didn't want to *destroy* the world). They hadn't quite finished the machine, but that had gotten to the part where it was "programmed" with the basic rules of reality and How Things Are Supposed to Be.
So world-ending magic hits world-shaping magic, and now there's one city left in all of existence. The conflicting magics have made most of the city into a chaotic maelstrom of wild magic and what-the-fuck, including a complete lack of any kind of cohesion to the terrain... everything's constantly changing and shifting, buildings aren't where they're supposed to be, and so on. You can walk down one street, turn around, and find yourself walking back down a completely different street. You can walk into the closet of your house, only to find that that door now leads to the King's bedchamber, then walk back through it to find yourself outside in a graveyard.
The wild magic also twists and corrupts all those who spend too much time in it. The weak-willed become like zombies, only still alive, while those with strong wills and dark thoughts become monstrosities bent on further death and destruction. There are only a few that manage to keep their form and sanity now.
Only at the center of the city is reality anything like what it's supposed to be, because that's where the machine is. The last remnants of humanity have gathered here to try to stay alive and fix things.