Whenever someone kills a creature at night zombies and skeletons of that creature would spawn and attacks anything that comes close until someone harvests the corpse. furthermore one should be able to pick up the dead bodies and drop them anywhere and they would start spawning zombies and skeletons.
I don’t think I agree with this. unless of course you mean while in the unnamed city or the barrowlands perhaps. Even in a magically rich place like the exiled lands there should be some sort of ambient corruption to cause the dead to rise.
In fact Klael mentions in the unnamed city that the dead only rose because we exiles have been disturbing their sleep.
May Set be with you 