The outer ring, lower zone, and part of the middle zone of Hyperion Corporation have all been cleared out to accommodate "World Migrants".
These areas have been collectively referred to as the [Zombie Factory].
A detailed, stable, and controllable management method has been employed in these areas, with the following basic process:
Madmen arriving from all over the world to Hyperion, upon approaching within five kilometers of the company, will be eroded and infected by "metal spores," and some of the lowest-grade madmen will directly transform into "Metal Zombies".
For those madmen in good physical condition, they may resist the lower density of metal spores on the outskirts and successfully enter the Lower Zone structures of the company (warehouses, stations, basic workshops, etc.).
There, they will be infected with a higher concentration of Hyperplasia funguses, transforming into zombies of higher mutability and diverse forms.