Kono Boukensha, Jinruishi Saikyou desu ~Hazura Skill "Kantei" ga "Keishou" ni Kakusei shita no de, Amata no Eiyuu-tachi no Chikara wo Uketsugi Musou …

[MangaDex]

 

[Kortez]

I'm calling it now. He's using the villagers as living batteries to power the city.