How did Guan Yu's dragon crescent moon blade come from?

Anyone who has read the Romance of the Three Kingdoms knows that the red hare is running at full speed, holding the dragon crescent moon blade. The Red Rabbit Horse was originally given to Lu Bu by Dong Zhuo, but Lu Bu was captured in Baimenlou. The red rabbit horse was obtained by Cao Cao, and was given to Guan Yu in order to buy his heart. So how did the dragon crescent moon blade come from? It is said that Guan Yu was superb in martial arts when he was young, but he only hated not having a satisfactory broadsword. So, he invited the best weapons master from several nearby villages to Guanjiazhuang to discuss making the best broadsword for him. An old master asked: I wonder what kind of broadsword Guanzhuang wants? Guan Yu asked: How many knives are there? The master said: There are six kinds of knives: iron knives, steel knives, pure steel knives, soft steel knives, green steel knives and treasure knives. Iron is refined into steel for a long time, and steel is refined into soft and pure for a long time, then refined into green, and even more refined into treasure. Most people can only make iron knives and steel knives. As for pure steel knives, nine out of ten will break; Soft steel knife, if you build a hundred, you will break 99; As for the blue steel knife and the treasure knife, they are all rare treasures in the world. Guan Yu listened and said: Guan Mou wants to play nod. The masters shook their heads and spat out their tongues. Guan Yu said: You don't have to worry. No matter how many knives are broken, someone will bear it and not pay a penny.

After listening to this, the masters began to choose materials to give Guan Yu a knife. Dozens of broadswords were broken in a row, and even mild steel was not made. Guan Yu didn't care at all, and he still served wine and rice every day without complaining. The masters were guilty, more focused and carefully operated, and finally one day they became a green steel broadsword, shiny and cold. Everyone was very happy and gave it to Guan Yu. Guan Yu asked what kind of knife it was, and the answer was blue steel knife. Guan Yu said that he still needed to improve, and Old Master Q said: Guanzhuang and Qinggang knives cut steel and iron, which are treasures on earth. The green red sword is made of green steel. Green steel refining treasure, we have no precedent, and it will be too late to break it again! Guan Yu waved his hand and said, Needless to say, Guan must have a good sword.

They had no choice but to take a big knife and polish it again. At the last moment of refining, it was already dark and a bright moon was in the sky. Suddenly, a bright light came out of the generate in the furnace and went straight into the sky. The master shouted: No! Get out of the way! The knife is going to explode! At this time, it happened that a dragon passed by in the sky and was hit by light. The dragon was beheaded in an instant and then returned to the sword. Dragon blood soaked the blade, just like quenching. This broadsword was refined without frying Bao Dao, a dragon. Guan Yu was overjoyed and rewarded many masters. Because this Long Bao Dao is in the shape of the moon, it is called the Dragon God, Mirumo and Mirumo.