The names of the two swords are Yitian Sword and Qinghong Sword

1. Yitian Sword

Yitian Sword is the sword of Cao Cao in the Ming Dynasty novel Romance of the Three Kingdoms. It is known as the world's most famous sword, along with the Qinghong Sword, and both are owned by Cao Cao. It is said to have been named after the famous line in Song Yu's Da Yan Fu (The Great Words), "The long sword is leaning against the sky". The sword was so sharp that it became a synonym for the sword. A generation of poets, Li Bai, also admired it, "Linjiang Wang Jieshi Song" has the sentence "An get the sword of the sky, across the sea to cut the whale".

2. Green Rainbow Sword

The Green Rainbow Sword is a divine weapon that is known as the Sword of Leaning on Heaven, and is as sharp as mud. It is one of the two swords owned by Cao Cao, and the hilt of the sword has the word "青釭" embedded in gold. In the Romance of the Three Kingdoms, Cao Cao wore this sword for Xiahou En, who was stabbed to death by Zhao Yun and then owned by Zhao Yun, who made his way through Cao Cao's army like nobody's business, chopping down two banners, capturing three long lances, stabbing with a sword before and after the battle, and killing more than fifty of Cao Cao's generals, making him famous in the battle.

Expanded information:

In the "Popular Romance of the Three Kingdoms", after the death of Lu Bu, the Fangtian Painted Halberd was refined by Cao Cao into two world-renowned swords: Yitian and Qingyan, and the Red Hare was sent by Cao Cao to the righteous and desperate Guan Yu, who used the Yitian to suppress the power and Qingyan to kill. Cao Cao used the Yitian Sword to control his power and the Qingyang Sword to kill people, with the Yitian Sword being Cao Cao's personal sword.

Since then, Cao Cao has been known to say, "It is better for me to lose my life than for others to lose theirs". Cao Cao gave the sword to Xiahou En, who was killed by Zhao Yun at Chang Ban Slope, and the sword was taken by Zhao Yun.

The sword was as sharp as iron. At the time, Hahou En was so proud of his bravery that he was carrying Cao Cao's hanging sword on his back, and he was just trying to attract people to loot and pillage. He did not want to run into Zhao Yun, and was killed by him with a spear. He seized the sword, and realized that it was a precious sword by looking at the word "青釭" (青釭) embedded in gold on the target.