He was nodding as thought, 'Without lifespan, I won't die. But I might also become unable to think and move, which might not be worse than death. So I shouldn't try to see how bad things will get when I run out of lifespan.'
'All in all, becoming a Dao Lord is a good thing. It can be said that my entire existence has undergone a transformation, turning me into something else entirely. I have become bigger and better.'
'If the price I have to pay for this is my inability to return to the Sea of Worlds, it is completely fine. Unfortunately, it isn't the only thing I've lost.'
As he was expanding, he could feel that he was slowly losing the ability to use his Cave Heaven as a source of power. Apparently, while the third heaven was quite accommodating to his body, it was intolerant of the world within him.
