Western Fantasy, Demon King? Please Call Me Shura Emperor

Levi was just an ordinary engineer on earth, but late at night while working overtime, he was dragged into a different world by a bloody summoning array. The place where he landed was the last refuge valley of the Demon Tribe - which was currently being bloodbathed by the allied forces of humans, elves, and orcs. And the silver wristband that appeared inexplicably on his wrist became the last hope in the eyes of this dying race. "Star Warrior, please save us!" The instinct of survival made him activate the armor called "Shura" and crush the enemy with a crushing force. But he soon discovered that he and these demons who had been abandoned by the world were bound by a cruel blood oath: one would be prosperous, one would suffer. In order to survive, he had to lead this group of old, weak, women and children to struggle to survive in the hostility of the world. He used the earth's engineering to build cities, used the laws of armor analysis to train his army, and spread the order of science and technology in this land where magic reigns supreme. The Demon Tribe regards him as the "Emperor Shura", while the entire continent regards him as the "Heretical Demon King" who must be purified. When the iron hooves of the coalition forces stepped onto the city again, giant dragons and forbidden spells covered the sky, Li Wei stood in front of the formation, with unyielding will burning in the eyes of the warriors behind him. He looked down at the thousands of enemy troops, and a calm announcement came from under his mask: "You believe in blood and divine grace, but I believe in steel and will." A war about the definition of civilization begins.