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The difficulty lies in the cultivation after ascending to the Tao Realm.
As of today, he had come to understand that the Tao Realm is divided into three steps, and in the Extreme Ancient World, even in Chaos, ninety percent of the Tao Ancestors reside at the first step.
The first step of the Tao Realm is where the Tao Boundary is already formed, and the most crucial aspect is Law Creation, creating one's own 'Tao and Law', then refining it into a Tao Fruit. The Tao Fruit is the core of the first step's cultivation; when the Tao Fruit takes shape, one can step into the second step.
The Calamity Tao Ancestor was at this step.
The main objective of the second step in the Tao Realm is to integrate the Tao Fruit with the Tao Boundary into unity.