Time drifted on.
The plants in the valley yellowed, then greened; greened, then yellowed again.
Inside the cave abode.
Aaron spat out another mouthful of blood essence, refining the Heaven Derivation Gu.
By now, the tortoiseshell had shrunk several times over, becoming a black silkworm chrysalis, its surface engraved with countless mysterious patterns.
This was the Heaven Derivation Gu's true form!
To refine the Heaven Derivation Gu to this point, Aaron had already invested at least a million years of lifespan!
"With such a refinement method, perhaps only Primordial Spirit loose immortals could sustain it?"
"No... even though Primordial Spirit loose immortals have infinite lifespans, if they played around like I did, they'd still... be finished! Once lifespan is blood-sacrificed, heavenly tribulations come early... Blood-sacrificing a million years of lifespan would mean countless heavenly tribulations descending at once. I'd surely be reduced to ashes."
"It seems my Longevity is not the same thing as the Longevity of Primordial Spirit loose immortals."
Yet the expenditure of so much lifespan had brought gratifying rewards.
The Gu insect in Aaron's hand had astonishingly been refined to the eighth refinement!
"In truth... Myriad Gu True Lord only deduced Gu insects to the sixth refinement..."
"I deduced the methods for the seventh and eighth refinements based on his foundation, continuing the deductions with the insight and experience of ten thousand years of immortal cultivation... I even used lifespan in place of many materials."
"From now on, in this world, people or objects capable of calculating my whereabouts are already exceedingly rare..."
As for the ninth refinement?
Aaron still had several difficult problems in Gu refinement to resolve, and the lifespan expenditure would also increase explosively.
It already involved the workings of the laws of heaven and earth; it would not be so easily refined.
Still,