If the Demon King Were Reincarnated into a Super Mechanical Civilization!

The Demon King, who had mastered all types of magic and all their variations, and was praised as the strongest in all things, died. However, through a reincarnation spell he had prepared in advance, he would inherit everything in the future and start over. This time, he would conquer the world for sure. But that world was far removed from the era in which the Demon King had lived—it was ten thousand years in the future! Ultra-cutting-edge technology, robots, beams, powered exoskeletons, everything you could imagine. However, such things have no effect on the Demon King! This is such a story. ※Please note that this is a reincarnation story with strong personal interpretation.