Refining a Level Four Upper Grade weapon was far more complex than forging a Level Four Low Grade weapon, requiring over twenty different types of materials just for the forge.
Lin Feng added more than a dozen main materials, continuously melting them. Since Lin Feng had stepped into the True Xuan Realm, the True Fire transformed from his Dark Power was much stronger, and he melted the materials at a very fast rate.
In less than a quarter of an hour, all the materials had completely melted into liquid.
The next step was to remove the impurities within the melted materials. Fortunately, Lin Feng's spiritual power was incredibly strong, and the impurities inside the furnace could not hide under his spiritual power's sweep.
Another nearly quarter of an hour passed, all impurities were removed, and the materials became an extremely pure solution.
Subsequently, Lin Feng added three more materials into the furnace.
