chapter 305 Strengthen Qi and Blood

"There are three flesh furnaces here, namely the copper furnace, the silver furnace, and the gold furnace. The strength of each flesh furnace is different. The copper furnace is the weakest, and the gold furnace is the strongest."
"The trial taker needs to stay in the copper furnace for one hour, in the silver furnace for half an hour, and in the gold furnace for a quarter of an hour. If the trial taker stays in the copper furnace for less than one hour, the trial will fail and he will...