C682 Pill Refining

After a moment, Su Wen slowly opened his eyes. He set up a restriction in the surroundings to prevent outsiders from breaking in. Pill refining was an extremely exhausting task, especially for such high-quality pills. If someone were to disturb him, it was very likely that his efforts would be in vain. Su Wen took out a special Pill Refining Furnace. It was completely black in color