With the support of the Changqing Immortal Sect secured, Lu Yuan lost all doubt about gaining control over the main power in the Nine Countries of the Southern Domain.
As the nominal ruler of the current Changqing Domain, the Changqing Immortal Sect naturally carries a sense of legitimate justification.
Now that it supported the Taiping Dao taking charge of the Southern Domain, it was tantamount to legitimizing the Taiping Dao's control over the Southern Domain, granting it the legal right to expand its influence in the region.
This alone, for the major Immortal Sects that still needed to maintain some semblance of surface effort, was the greatest support they could provide to the Taiping Dao.
Not to mention.
Although the Changqing Immortal Sect had declined, it remained the overlord, still the strongest Immortal Sect in the Changqing Domain, and in the eyes of other sects within the domain, it was still that beacon of light.