Saintlands weren't just the Billowing Saint Race's holy ground, but the holy grounds of the underground world's entire first layer. Reportedly, it was connected with the second layer saintlands through countless ways. A year ago, Serenity Saint daughter, who was originally supposed to be married off to the holy son of a powerful saint race in the underground world's second layer, escaped with that youngster from outside from these saintlands, causing a huge loss of face for the Billowing Saint Clan.
Saintlands were dangerous. When the subterraneans entered, nine out of ten died. It was even possible that not one out of hundred could come out alive. What made them puzzled was that when the outsiders entered, they had a much higher chance of survival. There were many such precedents.