C407 Art of sealing

The owner continued, "According to the rumors, that furnace was the exclusive furnace for the generation of master refiners. But later on, in order to forge the Divine Weapon of King Dao, the master forcefully refined it again, and in the end, he lost all his strength and sprayed a mouthful of blood on the furnace. The master fell, and from then on, the furnace can never start a fire again