The secret alchemy art of the Fourth Branch of the Yaochi Sect not only contained the methods for refining physical objects into pills, but also possessed techniques for refining energy into qi pills!
The so-called qi pills were truly high-grade elixirs. Legend had it that they were items from the upper realms. Whenever a qi pill appeared in the mortal world, it would summon the Heavenly Tribulation. One had to swallow it immediately, and right in the gap as the Heavenly Tribulation gathered, absorb it directly into one's own body. Once the Heavenly Tribulation dissipated, the pill would truly belong to the practitioner.
However, the pill Yun Feng had just refined with dragon fire was not a true qi pill in the strict sense; he had merely used the technique for refining qi pills.
Chapter 647