The so-called thousand-kill sword was not really a thousand killing intents. The stronger the weapon-refining technique, the stronger the killing path law infused into the spirit sword. Two hours later, both of them were covered in sweat, and their expressions became more and more solemn. However, he zhengdao had already injected 670 strands of killing intent, while Yan Zhengming had injected 650 strands.
Although there was only a difference of twenty strands, just like cultivation, it would become more and more difficult as one progressed. From the sweat and solemness on their faces, it was not difficult to tell that they had already reached their limits. Even if one more strand of killing intent was injected into them, it would be a great test. If they were not careful, not only would all their previous efforts be wasted, but it was also very likely that their spirit weapons would explode, and their primordial spirits would be injured by the hundreds of killing intents.
