C326 Breaking Through Two Layers in a Row

In the field of alchemy, besides the fire and temperature, there is also a particular timing.

If one wanted to refine some extremely difficult pill, not only would one have to choose the auspicious day when the furnace was ready, one would even have to grasp the timing of the pill to an extremely precise degree.

Borrowing the grace of heaven and earth, one could become a supreme immortal pill