Solution

What Luna was lacking was a place to practice. But didn't Dyon himself just gain the most suitable place? 

Dyon didn't know how Luna's body would react to the Immortal Plane, but if she increased her control of Immortal Qi, it would greatly benefit her. 

'We don't have much time…' Dyon was still unsatisfied with this. Luna had lived for billions of years, but even all that experience wasn't enough for her to control Immortal Qi. Who knew how long she would take?

He needed a better solution. 

'If only the Energy Core was the solution.' 

Dyon wouldn't hesitate to give Luna the Energy Core if necessary. However, it didn't fix the problem at all. After all, controlling energy was the Energy Core's active ability, not passive ability. While Luna was essentially an Energy Core with controlling energy as her own passive ability. 

What did this mean? It meant Luna was already better than the Energy Core at controlling energy.