The Gu refinement hall was filled with white radiance.
The light blazed ten thousand zhang high, impossible to look at directly.
A dense aura lingered between mortal Gu and Immortal Gu; clearly, the Gu refinement had reached its most crucial stage.
Fang Yuan stood bathed in the deepest part of the white light, pouring all his concentration into it. Beside him stood Mao Liu, the Refinement Dao Gu Immortal, his face full of solemnity and tension.
"Now!" Mao Liu suddenly spoke, actually withdrawing the entire Refinement Dao Gu Formation!
It turned out that the most suitable method for refining Heavenly Mystery Immortal Gu was a light path refinement method. Any other path's refinement method would only yield twice the effort for half the result, and some would even have the opposite effect.
Moreover, at this final step, the Refinement Dao Gu Formation had to be withdrawn, relying purely on the Gu Immortal's spiritual inspiration and ingenious thoughts to complete the last stage.
This was the most unusual aspect of refining Heavenly Mystery Immortal Gu. Almost no other Immortal Gu had such a requirement.
Only Heavenly Mystery Immortal Gu could not endure any restraint or restriction. It could only be refined amid free and wondrous movement.
Without doubt, this was an immense test for the Gu Immortal refining the Gu.
For at that instant, the Gu Immortal had to replace the role originally played by the immortal formation, guiding the entire refinement process through its final step.
Yet the Gu Immortal's guidance could not go beyond the proper measure. The moment it did, it would become a restriction and constraint, and Heavenly Mystery Immortal Gu could not condense.
This required grasping an ineffable balance. Its subtleties were difficult to express in words; only a Gu Immortal refining Gu could experience them