Release That Witch
Cheng Yan travels through time, only to end up becoming an honorable prince in the Middle Ages of Europe. Yet this world was not quite as simple as he thought. Witches with magical powers abound, and fearsome wars between churches and kingdoms rage throughout the land. Roland, a prince regarded as hopeless by his own father and assigned to the worst fief, spends his time developing a poor and backward town into a strong and modern city, while fighting against his siblings for the throne and absolute control over the kingdom. Join Roland as he befriends and allies with witches and, through fighting and even farming, pushes back invaders from the realm of evil.
The Limitation of Magic Power
"What did I just see? A self-generating system of electricity that doesn't need an external energy supply!
Mystery Moon's ability is an attaching type of magic so the answer is clear. She added a brand new property to the metal frame, and "her magic power acts as the energy supply," Roland mused to himself.
"How did you manage to do that?" Roland asked aloud.
"When you said that there's an intertwining relationship between electricity and magnetism, and that they're indivisible, I wondered if I could make the objects generate lightning by magnetizing them. I tried to add a constantly changing magnetic forces to the copper wires because you've said creating electricity requires changes in magnetic forces. Then it turned out this way," Mystery Moon answered cautiously, her eyes sparkling with expectation.