What was the mysterious prophecy in history that scared Qin Shihuang to death? Be more detailed and it is best to answer in modern writing.

Thirty secret and unsolved cases in history: the mysterious prophecy that scared Qin Shihuang to death. Pingshu Road in Huayin County is deserted, like a forgotten road. The road was desolate, with late autumn leaves turning and falling all over the place. It was getting late, and the envoys who were envoys to Guandong were passing by in carriages. A chill spread down the spine and penetrated the chest. The further we went, the deserted the carriage became. Just as we were about to exit Pingshu Road, a stranger suddenly appeared in front of us and stopped the carriage. The man held a piece of jade in his hand and quietly handed it to the envoy. The messenger took it suspiciously, but before he could say anything, the other party said something first: "This year the ancestor dragon will die"! Really loud. The messenger was so frightened. "This year the ancestor dragon died." Ancestor means the ancestor, the forefather of mankind; dragon means the symbol of the king. It means that Qin Shi Huang is going to die this year. The stranger said these stone-cold words and walked away quickly with a face. The messenger came back to his senses and tried to find him again, but he had already disappeared. He didn't even take a look at the person coming. He just felt that the matter was important and accelerated towards Xianyang, the capital of Qin State. This day was in the late autumn of 211 BC, the thirty-sixth year of the First Emperor. The envoy returned to Xianyang and immediately reported the strange events encountered on the way to Qin Shihuang. Qin Shihuang was terrified! Although this was not the first time he had predicted such a curse, for an emperor who was superstitious to the extreme, this was undoubtedly a heart-piercing attack, and it was difficult for him not to recall the first time the curse appeared. Speaking of which, it is more like a nursery rhyme - "A Fang, A Fang, the First Emperor died." This popular rhyming ditty was circulated in the 26th year of the First Emperor, 221 BC. At that time, the common people were building the Epang Palace and the burden was heavy. This reactionary slogan is undoubtedly the voice of the people. Ten years later, in the thirty-sixth year of the First Emperor, in 211 BC, a second curse appeared. This time it was even more mysterious - in Dongjun of the Qin State, a meteorite fell from the sky. Just drop it. It was just a stone. What was shocking was that the stone was engraved with six characters: "First Emperor" Death and division of the earth.” This thing is strange. The meteorite is engraved with characters. Could it be that the stone was engraved with characters and then fell from the sky? With the scientific knowledge we have now, this is simply a myth. Even in the era of Qin Shihuang, it was difficult to be completely convinced. Someone must be up to something! This is not an ordinary case of disturbing social security. The sinister intention behind it is to curse the country's leaders to death and overthrow the country's power. The problem is extremely serious and belongs to Criminal Investigation Case No. 1. The censor was ordered to go to Qin Guodong County to thoroughly investigate the case. It's quite tricky. There is no clue and we can only rely on inference to find the suspect. There are two types of suspects identified. One type may be ordinary people. At that time, taxes were heavy, punishments were harsh, and the people were burdened with heavy burdens. Out of resentment, they used reactionary slogans to curse the country's leaders. This is Sima Qian's view. It makes sense. Another type of suspect may be the annexed nobles of the Six Nations or their descendants. They suffered a heavy blow in the war and hated Qin Shi Huang beyond measure. But they were unable to resist, let alone restore. They can only vent their personal anger, and they can definitely do it by carving reactionary slogans. But what troubles the censor is that he has no evidence. After many interrogations, no one dared to admit it. To admit it would be to seek death. The censor felt a dilemma. He could neither kill all the suspects, nor could he find the real culprits, nor could he explain to Qin Shihuang. The deadline to solve the case is approaching day by day. The censor was panicked and in desperation, he picked his scalp and figured out a countermeasure - "kill people and burn stones." Burn the offending stone to turn the curse on the stone into ashes; then, kill all the people around the place where the meteorite landed. The massacre was so intense that I would rather kill three thousand by mistake than let one go. The heads of innocent people fell to the ground like leeks, corpses were piled on top of each other, and blood flowed into rivers. Burning stones is a technical problem, beheading does not even require technology, it can be achieved with ruthlessness. The censor returned to the palace and reported the results of the case to Qin Shihuang. Qin Shi Huang's face was expressionless, neither angry nor happy. He neither praised nor punished the censor for his incompetence. He knew that if the case continued to be investigated, it would remain an unsolved case and would have to be closed. The bill was hastily concluded. Not long after, something even more unexpected and devastating for Qin Shihuang happened - a mysterious figure appeared in Pingshu Road, Huayin County, leaving behind a piece of jade and a terrifying prophecy: "This year the ancestor dragon will die"! Qin Shihuang looked at the jade carefully and called officials to inspect it carefully. The results of the investigation almost made Qin Shihuang choke to death. This jade does not belong to anyone else, but to Qin Shihuang himself. In the twenty-eighth year of the First Emperor, in 219 BC, when he was on a southern tour, he passed by the Yangtze River and accidentally left this jade in the river.

After a few years, it miraculously returned to the hands of Qin Shihuang. Is it an arrangement by the gods? Did the gods predict that he would die this year? Qin Shihuang's spirit felt as if he had been hit suddenly by a heavy fist, and he was instantly exhausted. His body weighed a thousand pounds, but his feet felt like stepping on cotton. His heartbeat was violent and his pulse was weak.