In the Name of the Devil

Sauron, who had just crossed over and became the Demon King, thought he could continue to rule the world safely, but was told that the human steam army had arrived at his doorstep. Warcraft versus steel, spells versus firearms. Isn't it just a hot weapon war? I've seen a lot! However, first, let's study the Supreme Ring left by the previous Demon King and become the strongest Demon King in history!