With each change of host, Yi Chen grew increasingly adept at invading and infecting them,
Having immersed himself in absorbing knowledge for so long, he had even cast aside the question of time, nearly forgetting his true identity as a human.
Besides,
Yi Chen had also used the hosts' memories to gain a general understanding of the Old World (before it was sealed off).
The Source Plague Zone could be compared to a major power in the Human World. Sick Ones who came from the Source Plague Zone held considerably higher status and even enjoyed numerous privileges.
Most Sick Ones born in the Old World shared essentially the same goal: through their own unremitting efforts, they would obtain recognition from a Source Plague Zone, be accepted as internal members, and acquire the corresponding disease system.
Apart from the Source Plague Zones, the Old World also contained countless neutral cities and countries. However, once many of those neutral cities were entered, there was no way back out... People could even privately compile a table of "city survival rates."
After all, Sick Ones reproduced far more efficiently than humans. It was common to see a female crouch down somewhere in the wilderness, only for children to crawl out from the holes one after another before a month had passed.
To stabilize the population, the Old World had no laws to speak of, much less anything resembling individual rights.
Even more importantly, the greatest difference between it and the Human World was that the Sick Ones made perfect use of the world's space.
The ground was merely the shallowest Surface Layer. The weakest groups of Sick Ones lived there, but it was also the most diverse region, and the place most likely to give birth to new types of Sick Ones with limitless