Nine Heavens.

Summary

In the story, Yi Fan consumes the Iron Tree Fruit after breaking its tough shell. The old Taoist informs him that the little fox is about to advance, as it has been affected by Yi Fan's primal flame. The fox is close to developing a fourth tail due to the purple-black flame from Bi Fang. Yi Fan feels frustrated as he has to hunt for food after the fox's efforts. Over two days, the fox remains asleep while Yi Fan undergoes rigorous training, which includes chopping stones with a branch. The old Taoist insists on this peculiar training to teach Yi Fan a celestial technique. After half a month of struggling, Yi Fan expresses his doubts about the technique's usefulness. The old Taoist demonstrates the technique by effortlessly splitting a large stone with the branch, revealing the power of energy compression. Inspired, Yi Fan resolves to practice diligently.

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