Moreover, at that time, they hadn't discovered the attribute of internal impurity. They thought that by using inhibitors to slow down the activity of the zombie virus, although it wasn't possible to eliminate the virus, as long as it never became active, they could avoid the danger of turning into zombies.
Then they discovered through testing that inhibitors could not only be used on infected individuals but were also extremely beneficial to ability users.
When an ability user merged with too many crystal cores and accumulated too much internal impurity, they too risked turning into zombies. The inhibitor could suppress this risk as well.
Theoretically, even a person whose internal impurity was at 90% could avoid turning into a zombie forever as long as they continuously used inhibitors!
Of course, that was just in theory. In reality, there were too many uncontrollable factors, and it would be very dangerous to actually have such a person.
