"North Old Master," Lin Feng's eyebrows knitted together. From the tone of North Old Master, it seemed as though he was conveying final wishes, which gave him an ominous feeling.,Lin Feng's heart stirred. This set of martial arts techniques didn't have any requirements for strength, anyone could cultivate it regardless of their cultivation level. The prerequisite was that they could understand it.,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.。