The ancestors of the Ye Family who had fought True Spirits and survived—namely Flowing Cloud Fairy and Ye Yuhuan—had not been incapable cultivators. They simply had never been able to encounter a True Spirit.
Forget True Spirits—even finding an Eighth Order Demon Beast was usually difficult. Eighth Order Demon Beasts could perhaps be found in a Great Ascension Cultivator's Dao Field or certain Ancient Battlefields, but True Spirits were even rarer and harder to encounter.
When the Immortal Realm Fragment appeared in the Profound Spirit Continent, Ye Yuhuan had led people inside to hunt for treasures and encountered the True Spirit Golden Crow. If not for the Spirit Treasure Ship, Ye Yuhuan would not have escaped.
Apart from Immortal Realm Fragments, True Spirits could also be encountered elsewhere, but it was purely a matter of probability.
Before ascending to the Immortal Realm, Flowing Cloud Fairy had opened two apertures and cultivated her Spirit Domain to perfection. That was how she had slain a True Spirit. After Flowing Cloud Fairy, few Ye Family members had managed to open two apertures and cultivate their Spirit Domain to perfection.
The Ye Family possessed the Ten Thousand Spirits Dao Fruit Tree, but its growth cycle was too long, and it produced only a small number of fruits each time. For a Mahayana Cultivator to comprehend the Spirit Domain through a Ten Thousand Spirits Dao Fruit and cultivate it to perfection, they needed at least two fruits.
According to the experience left behind by the Ye Family's ancestors, most Mahayana Cultivators needed to consume at least three Ten Thousand Spirits Dao Fruits to cultivate their Spirit Domain to perfection. A few Mahayana Cultivators with especially poor comprehension might need four or five Ten Thousand Spirits Dao Fruits before they could possibly achieve perfection.
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