As everyone knows, perfect creatures have incredibly powerful regenerative abilities. Even if their bodies are shattered, as long as they aren't damaged on the observational level, they're extremely hard to kill.
But being hard to kill doesn't mean they can't be killed! Every time they reform their flesh and blood, it requires the consumption of energy and stamina.
For a few times, twenty or thirty times, it might not mean much, but hundreds or thousands of times, when their energy and stamina are exhausted, their recovery speed will slow down significantly. Eventually, if their energy is completely depleted, they will die just like anyone else!
Right now, Dubo's body has been shattered by Zhang Menglong at least four to five hundred times, and he can clearly feel the energy and stamina within him fading. His recovery speed is slowing, and it's becoming increasingly difficult.
