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It took a full hundred years of effort before Lu Yuan could cleanse his Taiping Tao Fruit of the Heavenly Path's aura.
After the cleansing, Lu Yuan was left utterly drained in spirit and soul.
Describing someone as overdrawed and withered is exactly the state he was in at that time.
This also meant that although he did not want to waste Time, his body and divine soul truly did not permit it, and in the end, he had to rest for another ten years after cleansing the Tao Fruit before he could fully recover.
After cleaning the Tao Fruit, having removed the aura of the Great Tao that belonged to the Heavenly Path, the subsequent fusion with the Dao became much simpler.
Without the Heavenly Path's aura as an obstacle, Lu Yuan wanted to merge his divine soul and magic power with the Tao Fruit, and there was no obstruction at all.