The Best in Martial Arts

The young man asked: "What is the most terrifying weapon in the world? Is it the flying knife that is unstoppable for nine days and ten days?" The old man shook his head: "No." "Is it an evil sword that shakes mountains and rivers with one sword and no one looks at it?" "No." The young man asked in surprise: "Could it be the seven weapons rumored in the world?" "No." "Then what is the most terrifying weapon in the world?" "An iron sword." "An iron sword, why an iron sword?" The old man flashed a dazed look and murmured: "That's Shen Shengyi's sword."