The Vajra Dao Fruit was far too important to Li Changsheng. Back when he had been in the Skin Grinding Realm, it should theoretically have been impossible for him to cultivate Flood Dragon Skin, much less Dragon Skin. To cultivate Flood Dragon Skin or Dragon Skin, one needed to at least practice an Ultimate Skill-level Skin Polishing Martial Art. Yet he had only possessed a High-grade Skin Grinding Martial Art. Perhaps stacking its cultivation could produce Flood Dragon Skin, but no matter how much he stacked it, he should never have been able to cultivate Dragon Skin!
Yet in the end, relying on the Vajra Dao Fruit and stacking the cultivation of a High-grade Skin Grinding Martial Art, he had cultivated Dragon Skin—and brought it all the way to the Perfection Realm.
That was the heaven-defying power of the Vajra Dao Fruit!
If he raised the Vajra Dao Fruit to level 5, the foundation of his body would become even stronger, and Bone Refining would become easier as well. The Flood Dragon Bone Realm and Dragon Bone Realm would both be within reach.
He immediately swallowed the petals one by one. The Vajra Dao Fruit went to work, allowing him to rapidly absorb the energy within the petals, along with their Demonic Nature.
Soon, he had completely eaten one flower.
"It increased the experience by 5%. In other words, if I eat twenty flowers, I can upgrade the Vajra Dao Fruit to level 5!"
Thus, he continued eating the flowers.
It took him roughly one shichen to refine a single flower. He would need twenty shichen to complete the upgrade.
He ate while cultivating here. Even without Flawless Tiger Bone Secret Medicine, his rate of progress was still quite good.
Twenty shichen later, the Vajra Dao Fruit finally upgraded.
BOOM!!!!