```
"Satan's Ancient Book, it is a punishment instrument crafted by the Ancient Gods to punish Demons," Baji glanced at the family tree and immediately responded, "The book itself is made from the skin of Charm Sheep, which must be flayed alive, interwoven with the resentment of the Charm Sheep just before death. As for the groove on the spine, it's a Blood Crystal, a treasure used by the Ancient Gods to seal away Demons."
"The Ancient Gods sealed the Demons?" Marvin frowned, "Aren't the Ancient Gods and Demons on the same side?"
"Demons are dependents of the Ancient Gods, they each have their own names, such as Satan, Cain and the like, but Humans have given them a collective term—Demons," explained Baji.
