Variant Fireball

Rewen wasn't sure how difficult this is going to be. He could feel the difference between the magic power flowing through his body and the G.C. that flowed through his body. Magic power is like blood. It has no specific rhythm but has direction and dominantly travels throughout his entire body, except for the brain and stays active all the time.

G.C., on the other hand, is like thin current which appears once in a while and is directly connected to the mind. If the mind wants it, G.C. will appear. The direction and pattern can both be manipulated if trained enough.

Compared to the two, the Earth's mana is a completely different species. It has no pattern or direction and it's a common saying that "mana flows" but it doesn't exactly. It jumps from specific body points using mana strings, quite similar to G.C. currents. It is directly connected to the brain but to what degree, nobody knows. The key difference is the process to execute skill.