The young man planted the 'Death Sword' into his heart. Ten years later, when the sword sprouted, he began to melt. There is an "anomalous zone" between the world of martial arts and immortality. If a mortal crosses the line, his body temperature will be sucked dry by the "world"; if an immortal crosses the line, his mana will be ignited by the "human world". The "passengers" smuggled on both sides are called "ferrymen". Aura is not Qi, but "cold marrow" that only precipitates within the seven breaths before the corpse expires, like ice needles. Immortal cultivators nail cold marrow into the seams of bones to replace spiritual roots; the more nails are nailed, the higher the realm and the less human. To practice swordsmanship, you need to "seed a sword" first, bury a "dead sword" in the heart chamber, and nourish it with your heart's blood. When the sword sprouts, the sword cultivator will hear his own "future killing sound" - that is the last person he is destined to kill with this sword. Those who listen to the killing sound will not live more than ten years.
