Su Yuan's goal, of course, wasn't to become an immortal.
The only reason he said that was because he couldn't be bothered to waste more words on the Venerable of Immeasurable Calamity.
Ideas like using Chaos Qi to create infinite energy, or exploring the universe after becoming an immortal—he simply saw no need to explain any of that to the Venerable of Immeasurable Calamity.
Think about it: once he told the Venerable of Immeasurable Calamity these things, the other party would definitely berate him for defying the natural order.
Even if we took ten thousand steps back and assumed the venerable really did get tempted by these ideas, he would absolutely never abdicate and let another carry them out. He would personally execute the plan.
And the prerequisite for carrying out that plan was Su Yuan's Chaos Body.
So, one way or another, this battle had to be fought. There was no avoiding it.
What else was there for him to say?
"Su Yuan, no one can ascend in this realm."
