One with the Sky
"Three thousand mutation energy, huh…"
Ray touched his chin and looked at his first S-class skill, Space Mastery, carefully.
If he wanted to advance this skill further, it would require fifty thousand mutation energy just to progress.
This made him pause because Ray could definitely advance his A-class skill, Overlord of the Sky, to its maximum level, and also advance Space Mastery at least once.
But Ray was a little hesitant because he also needed mutation energy to cast his skills.
The most consuming was Overlord of the Sky; although its power was terrifying, the consumption was equally terrifying.
Without the reserve of mutation energy that Ray had, one would never be able to cause rain, let alone fill the entire sky with thunder and lightning.
That would be simply impossible!
"Hmm, forget it."
Ray directly upgraded his A-class skill with a thought.