@Kamelpov where did you get the idea that cultivators need to breathe oxygen?
Not to mention that he has some kind of source of life in him, I'd be suprised if he even dies when killed. Unlike last time he died now he can prb make his own body with that life power rather than bodyjacking.
Now that I think about it, when author killed MC a few chapters back he wouldn't even have died, so good work author for saying author is strong enough to kill MC when what he did wouldn't even have worked to kill the MC.