C897 Battle of Pills(2)

Besides the time it took to place the Medicine Pill, the Pill Fire underneath the furnace was also a benchmark for the Pill Alchemist refinement.

Ever since the pill refinement, the Pill Fire had changed several times, but it was very subtle. Only Xu Feng could feel it, and no one else could tell what was going on.

Roughly four hours later, a dull explosion sounded out from within the furnace