The Human Emperor of the Dragon Clan

In the distant ancient times, there were no space-based weapons, no wide range of destruction, and powerful nuclear weapons only had stone tools and bronze weapons. So how did ancient humans kill the four great monarchs and the Black King who were aloof and wielded the power to destroy the world? Even if we just let them sleep, they will come back one day... Relying on those hybrids who have a high probability of being incited to rebel once summoned? Relying on those stone tools and bronze tools that can't even scratch the body? Obviously not... Tags of this book: system, heavens, dragons, etc. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.