Yao Kongzi flew to the center of the island and pointed with his right hand. A dark blue flame shot forth and entered the deep crimson Medicine Cauldron resting on the ground. The flame slowly rose within the cauldron. An unusual fluctuation rippled out from it, and the surrounding space began to churn violently like boiling water.
"Is that... Blue Spirit Beast Fire?"
Sensing this change, Gu He was slightly taken aback. As he watched the dark blue flames, a trace of surprise flashed through his eyes.
Gu He had learned a little about Blue Spirit Beast Fire from the countless ancient books within the Pill Tower. The so-called Blue Spirit Beast Fire was not a naturally formed flame like the Heavenly Flames, but an artificially created fire. To form it, a fire-attributed Dou Zun first had to refine a Beast Flame. Using that Beast Flame as the foundation and nurturing it with a drop of the fire-attributed Dou Zun's heart blood, it could be transformed into a wisp of blue flame. Afterward, one had to continuously refine items rich in fire-attributed energy to allow the Blue Spirit Beast Fire to grow stronger. Once it reached dark blue, it would already be stronger than many eighth-tier Beast Flames. Even some Heavenly Flames could not compare to the Blue Spirit Beast Fire in terms of temperature. For alchemists who had not found a Heavenly Flame, Blue Spirit Beast Fire was an exceptionally good substitute.
However, while Blue Spirit Beast Fire had many advantages, it also had many flaws. First, the threshold was too high; one needed to be at least a Dou Zun. Second, when beginning its cultivation, using a drop of heart blood would greatly damage the cultivator's vitality for a short time. Without high-tier pills that restored vitality, it