After confirming there was no danger around him, Johnnie finally let out a sigh of relief and took out an Energy Core to refine and boost his own attributes.
[Refining Energy Core, Four basic attributes +10 points]
The prompt messages appeared, and a surge of heat flowed through his body as his four basic attributes instantly rose to 20 points.
Moreover, Johnnie had a distinct feeling that this was a true upgrade to his body, not restricted by the power of this place—in other words, his improvement wouldn't disappear even if he left.
Keep going!
Energized, Johnnie continued to refine Energy Cores.
[Refining Energy Core, Four basic attributes +10 points]
...
Prompt messages kept popping up, and Johnnie's power was climbing at an astonishing rate.
[Refining Energy Core, Four basic attributes +10 points]
[Ding, you have currently reached the Energy Core refinement limit. Increase mechanical talent to 20% to continue refining.]
