C113 life and death spring

The Old Master Lei glared at Lei Gang and said, "You useless trash, after studying for so many years, how can you refine something like that? If it was that simple, wouldn't I have started refining long ago? "

Lei Gang was also in his thirties, but upon being scolded by the Old Master Lei, he was speechless. He looked at the cadaveric core and did not speak further