Na Ling Space!
Two tiny fish, one black and one white, chased and played with each other. Xu Haoyu kept his Soul Strength focused on the two fish, familiarizing himself with and comprehending the yang energy, yin energy, vitality, death energy... within them.
Only when profound exhaustion rose from the depths of his soul did he reluctantly withdraw his Soul Strength, though his mind remained immersed in his dantian.
Looking at the Sea Urchin Dou Crystal within his dantian, he saw that one of its nine barbs had already shortened by nearly half. Once it had fully retracted into the Dou Crystal, it would be time for him to advance to a two-star Dou Ling.
Xu Haoyu felt greatly satisfied. It had not been long since he broke through to one-star Dou Ling, yet he had already made such progress. This cultivation speed was already terrifying.
The Earth Rank Middle Level cultivation method deserved some credit, as did the Fallen Heart Flame's tempering of his Dou Qi. Speaking of the Fallen Heart Flame, the Heartfire poison that had once affected him no longer had any effect after he refined the Yin Yang Dual Flame.
The Yin Yang Dual Flame could absorb all traces of Heartfire aura. For the Yin Yang Dual Flame, absorbing the Fallen Heart Flame's energy would allow it to make the greatest progress in the shortest time.
An idea arose in Xu Haoyu's mind:
*Among the top ten on the Strong Ranking in the Inner Courtyard, one can enjoy the Original Heart Flame tempering the body. That will be the best opportunity to help the Yin Yang Dual Flame absorb the Fallen Heart Flame's energy. If I do it a few more times, the Yin Yang Dual Flame should undergo a minor evolution, becoming comparable to a