This was also why Zhao Cheng had found it easy to attain some of the earlier Heavenly Passes, even by taking the path of accumulation.
But the later ones, such as the Matter Body and the Body Spirit, could not be attained even after exhausting every possibility and calculating every calculable path. He still had to find an opportunity, elevate his understanding, and only then see through them.
As Zhao Cheng's final pass, the Energy Spirit had to encompass everything from the previous nine pillars before it could be born. Even if adding one more pillar only increased the difficulty tenfold, at this stage, quantitative change had already triggered qualitative change.
In truth, every additional variable increased the difficulty by far more than a mere factor of ten.
This was why Zhao Cheng had taken the path of using low-dimensional accumulation to build toward the high-dimensional. Otherwise, the Ninth Heaven would have been the endpoint.
Take Wuluo, for instance. He was now at the Eighth Heaven. At his rate of cultivation, given another ten-odd billion years, if nothing went wrong and he could continue making steady progress, he might perhaps touch the threshold of the Ninth Heaven. As for whether he could attain it, that was another matter entirely.
His Dao Fruit had long since solidified. Every additional pillar he cultivated would be a life-and-death nirvana, an overturning of his entire Dao Fruit.
In Wuluo's era, many immortals had died while attempting to break through this step, including even Heavenly Lords of the Eighth Heaven.
The realms of low dimension and high dimension were, at their core, both processes of continuously completing one's own pillars. The more pillars one had, the stronger one became.
However, Dao Fruits cultivated by using the high-dimensional to attain the high-dimensional were unstable. Before solidifying,