The Book of Knowledge said, "Master, on the left is a Thirsty Soul, feed it Humanity, it will produce an Evil Ghost Stone."
"On the right is a Boiling Soul, feed it Spirituality, it will yield a Devil's Stone."
"In the middle is a Detestable Soul, feed it Divinity, it will give rise to an Evil Ghost Stone."
Rod furrowed his brows.
"Feeding Humanity and Spirituality is one thing, but what on earth does feeding Divinity mean?"
The Book of Knowledge glanced at Rod in confusion, "It means an Evil Ghost!"
Rod covered his forehead, "I know, I mean, what are they used for?"
The Book of Knowledge replied naturally:
"You should be able to guess, an Evil Ghost King is born from an Evil Ghost Stone, a Devil King can naturally be born from a Devil's Stone, and from an Evil Ghost Stone, an Evil Ghost King can be born."
