The Divine Realm was under siege just before it was sealed off, with members of the royal family represented by their mother, including Gu Qingqing, fighting fiercely against the rebels. The result was mutual destruction, and apart from Gu Qingqing and her siblings being sent away by their mother, only the then High Priest of the Divine Clan was spared because he never involved himself in these matters. However, he willingly chose to reincarnate simply because he had fallen for Gu Qingqing in her past life.
Now, as they return to the Divine Realm, the outer appearance remains resplendent, but many places within have become dilapidated. Fortunately, the Divine Realm has self-restoring arrays; they only need to activate the arrays to restore the destroyed buildings.
Before this, however, they must reactivate the Divine Clan bloodline within them and, with the infusion of Divine Energy from the Divine Realm, fully convert their immortal power into pure Divine Power.
