Lin Yi wanted to use the art of Dragon mastery to transfer energy to Xinyan, but she wasn't a spirit beast-she didn't have a practitioner's art, and couldn't guide Lin Yi's all-powerful Qi to complete the conversion. Xinyan's body was special, too, as it was beyond the five elements. Lin Yi couldn't even choose a practitioner's art for her, because his attributes were unknown. He didn't know what she should practice.
After all the failed attempts, Lin Yi gave the White energy stone to Xinyan first, telling her to put it in her chest pocket to test the effects.
A week later, the energy stone on Xinyan's chest changed slightly. It was a small change, but it didn't escape Lin Yi's eyes-he'd noted down the condition of the energy stone very carefully, and the energy stone on the second day was a little dim-it was very faint, but it meant that Xinyan's Jade could be replaced with an energy stone!
