Might Duy, also known as the “Eternal Genin,” was a shinobi of Konohagakure who played a significant role in the founding of the Hidden Leaf Village. Despite being a low-ranking shinobi, Duy was known for his incredible strength, tenacity, and unbreakable will. However, there is no evidence to suggest that Might Duy killed the Seven Swordsmen of the Mist.

The Seven Swordsmen of the Mist were a group of highly skilled shinobi from the Hidden Mist Village, each of whom wielded a powerful and unique blade. They were renowned for their combat skills, and their reputation struck fear into the hearts of even the most seasoned shinobi. The Seven Swordsmen were so dangerous that they were assigned their own special mission group within the Mist Village, tasked with carrying out highly sensitive missions and assassinations on behalf of their village.
It is true that Might Duy was a powerful shinobi who had fought in many battles over the years. He was known for his incredible strength and his ability to endure even the most punishing of physical ordeals. However, there is no record of him ever facing off against the Seven Swordsmen of the Mist, much less killing them.
There are a few reasons why this claim is highly unlikely. Firstly, the Seven Swordsmen were renowned for their combat prowess, and defeating them would have required a truly exceptional level of skill and power. While Might Duy was undoubtedly a formidable fighter, it is highly unlikely that he would have been able to take on all seven of them at once and emerge victorious.
Secondly, the Seven Swordsmen were an elite group of shinobi who were specially trained and selected for their combat abilities. They were highly respected within their own village and feared throughout the shinobi world. It is highly unlikely that they would have been taken down by a single shinobi, no matter how skilled or powerful.
Finally, there is no record or mention of Might Duy ever fighting the Seven Swordsmen of the Mist. While he may have fought against other skilled shinobi from various villages over the years, there is no evidence to suggest that he ever specifically targeted the Seven Swordsmen.
In conclusion, there is no evidence to suggest that Might Duy killed the Seven Swordsmen of the Mist. While he was undoubtedly a powerful and skilled shinobi in his own right, the Seven Swordsmen were an elite group of highly skilled fighters who were feared throughout the shinobi world. It is highly unlikely that he would have been able to take them down single-handedly.