I of All Realms Can Summon the Tyrants of History

What will happen when all the historical tyrants conquer the world? This is an outrageous assumption. The protagonist's mental state is comparable to that of a peerless tyrant, and even has a dehumanized mind. Almost many TV series protagonists will be uprooted, but there is no harem, no indecisiveness, and almost no interest in the heroine. Everything is focused on fighting and struggle. If you don't like it, don't enter.