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 Utilization of Energy
On the afternoon of the fifth day, the electric motor stopped working.
In other words, a single Dawn I could provide energy for a large-scale electric motor to work for five consecutive days. If an electric motor didn't run continuously, then its work time could be extended. When the magnetic effect of the copper column was lost, it could be recharged with magic power, which was purely low-consumption, recyclable, and pollution-free energy.