Kafan continued. "We needed to find a way of getting rid of the Dead Souls. As long as we did that, the Soul Devils would have no more food. Well, they could kill living beings and take their dead souls after that. Still, compared to the abundantly available dead souls after so many years of war between the three realms, that was just a drop in the ocean."
"That would also resolve your other problem, having enough experts to deal with all the soul devils," Roan said. "Eliminating the dead souls before they could be consumed by Soul Devils also meant the Soul Devils wouldn't grow in power anymore. Sure, the Soul Devils' cultivation speed was extremely fast, but they also needed a ridiculous amount of dead souls to keep that speed."