But was it true that Seven Sins' sword contained fatal flaws?
The answer was no. No cultivator in this world was perfect and without fault. No matter the ability of cultivation, there would always be weaknesses. Perhaps the only weakness of Seven Sins was that for the Sword of Kasyapa to be released, it required a significant amount of sword will to turn it into an invincible sword. The Sword of Kasyapa would get stronger and stronger. Before, when all 13 swords were deployed, even someone as strong as Zuo Zong of the Dali Academy was unable to resist. Moreover, he could be stronger still.