This was because, despite his tremendous power, he remained a Dharma artifact, reliant on the strength of the artifact's owner. Only when the owner grew stronger could he eventually revert to his original form.
The anticipation for this day had been a prolonged wait, and he fervently wished it wouldn't be in vain. He hoped that, this time, the transformation would be enduring, sparing him the need to restart the process.
To attain the Sky Sect, time was the determining factor.
During the tempering, the Chaotic Space dared not stray from Gu Chaoyan, intensely focused on her breakthrough, fearing any disruption.
As Gu Chaoyan refined herself, her countenance portrayed a mix of relaxation and agony. She alternated between moments of suffering in the fiery heat and shivering within an icy chill.