The areas invaded by the Barbaric Soil are numerous, just as Qingxi had said — they were like grass seeds buried in the thick soil, needing only a sprinkle of rain and dew to immediately break through the earth and grow in an extremely wild and frenzied manner. Overnight, they could make an ancient city disappear, including the people residing within, who would also transform into Barbaric Yin Soldiers.
Wu Hen had encountered Ghost Face Vine People in Stonecutter Town, which were Barbaric Yin Soldiers — spirits of people erased by Earth Erosion, congealed into grudges. If not dealt with properly, these Barbaric Yin Soldiers might turn into a Barbaric Yin Army, rampaging and slaughtering the living where they dwell.