"They do not want to upset the balance of the secret realm. After all, the Heaven Realm Secret Realm has been passed down since ancient times, and even the Heaven Dao Sect cannot control it. If the powerful figures of the Heaven Dao Sect were to forcefully destroy the forbidden grounds, I am afraid it would cause the secret realm to collapse, and by then, even the Heaven Dao Sect could not bear the consequences."
So that was it.
"Even when disciples of the Heaven Dao Sect enter the Burial Dao Ravine, they are not guaranteed to obtain all the opportunities within. Most importantly, rumor has it that the Burial Dao Ravine holds all sorts of ethereal, ancient martial arts and treasures, which can only be acquired by those fated to find them. No one can simply take them by force."
Chapter 153