Saints sought to transcend the Heavenly Dao.
At the beginning, the Primordial World had only Hong Jun, a half-step Heavenly Dao Saint. Later, he merged with the Heavenly Dao and became the Heavenly Dao.
The other Saints could only become Heavenly Dao Saints.
Then, beneath the Heavenly Dao, in order to break free from its control, they would throw the Primordial World into chaos and seize the chance to liberate themselves.
Although the Three-Headed Bird did not know these details, it understood the broader trend.
That was, once Saints attained sainthood, they would come into conflict with the Heavenly Dao.
Afterward, the Three-Headed Bird began thinking of ways to help these Saints.
It wanted to become these Saints' lackey.
It wanted to help these Saints attain sainthood sooner.
The sooner they became Saints, the sooner the Primordial World would collapse.
The Three-Headed Bird first joined Daoist Shangqing's school.
Because Daoist Shangqing was rather accepting and lax in discipline.
In short, anyone with aptitude and a proper foundation would be accepted as a disciple.
He did not care about temperament or nature. As long as one had talent for cultivation, he accepted them all.
There was no need to question the Three-Headed Bird's talent for cultivation.
After all, it had destroyed countless worlds.
Naturally, it absorbed spiritual energy quickly and cultivated quickly as well.
As for whether Daoist Shangqing could see through its origins—of course he could.
But Daoist Shangqing upheld the principle of "teaching without discrimination."
He even taught Plague Gods who released epidemics. Why would he refuse a Three-Headed Bird that had destroyed a few Small Worlds?
On the contrary, Daoist Shangqing treated it quite well.
He even gave it an innate spiritual treasure, the Violet Lightning Hammer.
This was an innate spiritual treasure. Even one of inferior grade