Initially, the Natural Gas Race didn't sneak into the mineral veins to secretly transform others. Instead, they deployed spies.
They would transform some of their own people into other races, who would then infiltrate the corresponding mineral veins to spread the Abnormal Vein disease.
This is also where the term "sacrificer" came from.
After their material transformation, these sacrificers would develop different emotions. They were no longer ruled solely by fear.
These sacrificers were even willing to spread the Abnormal Vein disease for the sake of their people.
However, before the material transformation, most members of their race were unwilling to become other races.
Gradually, fewer and fewer of them were willing to become sacrificers.
Furthermore, as the Abnormal Vein disease spread, the other Mineral Races learned to identify these spies and began to actively expel them.
