I have a strange idea, I want to reality-check. But first, there's a thing to elaborate on.
So, there are these undead creatures, zombies, skeletons, Michael Jackson, who appear in large numbers during the night and disintegrate once the sun comes up. The UV light causes their tissues to rapidly decompose, and sometimes even catch on fire.
Zombies have human levels of strength and size (~175 cm in height) and enhanced endurance through redundancy, lacking centralized vital points (i.e: the entirety of the body is used in circulating blood), and faster blood-clotting. Skeletons actually have transparent tissue but need power magnification through bows to be lethal.
Undead are created in underground pods. The resources, needed to make them, are acquired from the earth by a gigantic network of fungus strands.
The problem is that they supposed to form within a day, from scratch. Sure the number, that has to be replenished, can be lower as some zombies will hide in caves or bury themselves. Still, some have to be replaced from day to day.
The technology, undead pods are created with, allows for pretty much unlimited genetic modification. The pods and undead, however, are still (mostly) made of carbon hydrogen and oxygen, have cells and whatnot.
If it's possible at all, how can these undead form under 24 hours?
The criteria are a bit complicated, like time-traveling in Marvel movies, but it boils down to:
They are as strong (physically) as they could be (at least strong enough to kill an adult human) without compromising their ability to keep showing up every night for the rest of eternity.
- That means strong and resilient undead...
1.2. Who'll always show up every night.
- They can grow in rather harsh conditions without any detrimental side-effect to the final product.
- They come on a daily basis, and never seem to stop. Though a method, that actually creates them from scratch every day, would be nice it only comes a poor second.