The Cyan Yang Secret Realm's Power of Restriction was exceedingly strong; even multiple Nascent Soul True Monarchs acting in concert could not break through it by force.
However, over many years, the Nascent Soul True Monarchs of the Cyan Yang Immortal Sect discovered that the Secret Realm's Power of Restriction weakened once every four hundred and eighty years.
The period of weakness lasted for roughly one year, after which the Power of Restriction would gradually restore itself.
It was a cycle that repeated every four hundred and eighty years.
During the period when the Secret Realm's Power of Restriction was weak, Nascent Soul True Monarchs could open the Secret Realm by joining forces. Thus, the Cyan Yang Secret Realm was opened once every four hundred and eighty years.
The Secret Realm contained countless Heavenly and Earthly Treasures, including a fair number of Tier Four Spiritual Items.
