The rotor-type Magic Powered Engine was one of the initial ideas when Gawain thought of the path toward "magic industrialization". However, it had yet to be achieved because the system's difficulty and complexity were far beyond any of the magical equipment that was designed up until this point. The rotor-type Magic Powered Engine required eight sets, ten sets, or up to dozens of uniformly arranged Repulsion magic circles that would be operated at the same time in order for it to work. When so many Repulsion magic circles were connected together, all the magic interference produced would be disastrous. Even using the calculations of rune logic to eliminate the interference problem, it was still abnormally difficult.
However, Jenni was still able to solve this difficult problem; at least, she had an optimization plan and the initial design of the rotor-type engine.
