There are several mods implementing shamblers into the game, but they usually force the boring grey weather all the time or just spawn swarms. That's ok, but I wanted something more natural. This mod is simple - what goes down will eventually go up. No hordes unless you allow them to form, and minimal changes to how the game looks.
What this mod does (kind of spoilers):
1. On every death rolls 20% chance to reanimate body after delay.
2. A random (configurable) chance to start a deathpall emission that will reanimate corpses and apply necroa virus from BlueEagle421's Necroa Archovirus to everyone not under a roof.
The emission is short and has a grace period before necroa starts being applied.
Mod can cause massive difficulty spikes if you don't take care of the corpses on the map.
Hunting can be impossible after an emission, but game tends to spawn new animals quickly.
Less raiders and traders will reach your base unless you clear a path for them.
Now has optional hard mode - Necroa gets applied to shamblers, so taking them out until emission ends can be more difficult as they will reanimate right after being killed.
I am literally a cat, my ideology does not allow intellectual work type, so this mod is 100% pure AI slop.