Not knowing how long he stood in place, the gaze of Lin Feng finally moved. His eyes closed slightly as he took a deep breath, and a mournful sigh echoed throughout the ancient hall.,"This is the martial art Old Empty cultivated," Lin Feng's gaze flickered. It seemed that Old Empty had refined the first move, "Slaying Shadow," and combined it with his unique shadow Wuhen, making it truly powerful.,Lin Feng subtly shook his head. Old Northern didn't mention this huge door to him, and it was clear that Old Northern as well as the predecessors from Cloud Sea Sect never opened this door before.。