In his deal with Mu Chengxue, he had not hesitated to offer up Breathing Soil in exchange for the complete Source of the Ten Thousand Year Ageless Spring.
All to ensure nothing went wrong, so he would have enough Ten Thousand Year Ageless Spring to refine Ageless Spring Spirit Crystals and improve the aptitude of his wood spiritual root.
The effects of top-grade Ageless Spring Spirit Crystals appeared to be greatly diminished.
Yet among top-grade spiritual roots, the more perfect they were, the greater the boost to a cultivator's strength.
The difference might seem subtle.
But on the path of cultivation, the farther one went, the more everything came down to details.
At the same cultivation realm and with the same strength, whoever possessed even the slightest additional means to improve their power might have a chance to take another step forward.
A hair's breadth lost, a thousand miles gone!
"If there were no opportunity to return them, then so be it. But now that I have the Heaven and Earth Furnace, there is no reason not to use the best resources to improve myself."
His gaze resolute, Su Shi'er murmured softly, his hands moving without the slightest hesitation.
With a sweep of his hand, the Heaven and Earth Furnace appeared silently.
The Ageless Spring Spirit Crystals he had refined over so long seemed to have found their direction, rushing into the Heaven and Earth Furnace in a torrent.
In an instant, the Heaven and Earth Furnace shook, azure light blazing within it.
No matter how many Spirit Crystals entered, they rapidly diminished at a visible rate.
It was not that the Spirit Crystals were decreasing, but that under the furnace's tempering, their grades were constantly changing.
The Heaven and Earth Furnace was a Heaven and Earth Supreme Treasure, so