Black-and-white flames blazed within the medicinal cauldron. With a wave of his hand, Xiao Yan first tossed the Transformation Grass inside.
The Transformation Grass was a vibrant green, like jade, yet it brimmed with a powerful, extraordinary medicinal potency.
The moment it fell into the cauldron, roaring flames engulfed it.
Faced with that terrifying power, the precious spiritual herb emitted a faint green halo, resisting the scorching heat.
"If this were before I refined the yin-yang saint flame, it might have taken quite some effort. But now..." Xiao Yan smiled faintly, and the temperature of the yin-yang saint flame inside the cauldron abruptly soared.
An hour later, the green halo within the Transformation Grass had finally weakened considerably. Xiao Yan continued refining it, and after another hour, the Transformation Grass burst apart with a pop, revealing a small cluster of crystalline, blue-green granules.
"The power of heavenly flames really is formidable." Seeing the yin-yang saint flame's effect, Xiao Yan smiled in satisfaction.
In the past, refining this single stalk of Transformation Grass alone would have taken him an entire day and night.
After placing the blue-green granules into a jade bottle, Xiao Yan tossed the remaining medicinal ingredients into the cauldron one after another.
The yin-yang saint flame continued its scorching work. Half a day later, all the ingredients had been fully refined.
Next came fusing them into a pill embryo.
After a brief rest, Xiao Yan raised the flames once more.
After devouring the yin-yang saint flame, the Flame Mantra had evolved to the Advanced Profound Tier. Though it could hardly be called a superior cultivation method, its control over flames rivaled that of an Intermediate Earth Tier method.
Combined with the Flame Mantra's unique properties, this gave Xiao Yan considerable reserves of Dou Qi. Even after refining such