I Got All the Golden Fingers

Lin Feng, who had just traveled through time, had gained all kinds of golden fingers. Grandpa A: "I can teach you how to make elixirs." Grandpa B: "I can teach you how to refine magic weapons." … System: "The host can upgrade all items" Mysterious magic weapon: "You can exchange items with me of equal value" Lin Feng thought for a while: "After I finish reshaping the bodies of your seniors, I wonder if your seniors would be willing to work in my magic weapon assembly line?"