Xiao Yang was extremely cautious when refining the Dragon Transformation Pill.
After all, this was a Ninth-grade Treasure Pill.
Although he possessed such experience, he had never actually put it into practice.
The difficulty of refining a Ninth-grade Pill was exceedingly high.
At the same time, a vast amount of Heaven and Earth Energy from the surroundings had to be infused into it.
That was why Ninth-grade Pills generally required a Dou Saint to refine.
Only by mobilizing the Heaven and Earth Energy of an entire region could it be done.
A Dou Saint could command a region of heaven and earth, drawing the Heaven and Earth Energy within it into the pill.
As for a Dou Zun, although he could also control the surrounding Heaven and Earth Energy,
the amount a Dou Zun could control was simply insufficient to support the formation of a Ninth-grade Treasure Pill.
Xiao Yang chose to refine it within the Exotic Fire Tower not only to avoid disturbances, but also for another purpose.
As the master of the Exotic Fire Tower, Xiao Yang could naturally command all the Heaven and Earth Energy within it.
One had to know that the energy inside the Exotic Fire Tower was enormously abundant.
Although it might appear to be merely a small tower from the outside,
the Exotic Fire Tower was actually extremely vast within and could contain boundless energy.
Therefore, Xiao Yang intended to use the Exotic Fire Tower to pour energy into the pill.
This time, Xiao Yang refined every stalk of medicinal material to its utmost limit.
Furthermore, according to his own understanding, he refined the Medicinal Material Essence to the level most suitable for refining the Dragon Transformation Pill.
Time passed second by second, and Xiao Yang soon finished refining all the medicinal materials.