Mental Energy was a universal power since it could be generated by living beings from all sorts of worlds, irrespective of their Genre. This was why the Systems could propagate to such a free extent.
It was because all worlds had conditions necessary for their growth and survival.
But in the end, Mental Energy was the inherent energy employed by the Systems. Using it to go against them was foolish. Compass Carburettor understood it in the previous war clearly.
While he was the Main Character, using Mental Energy was beneficial, since he was the Main Character System. But now, he wasn't. Therefore, relying upon Mental Energy would only make him vulnerable against the Systems.
Irrespective of how much he gained benefits from it, he was aware of one thing, his understanding regarding Mental Energy paled in comparison to the Systems.
After all, the Systems had an eternity to comprehend and evolve Mental Energy.
