Let You Farm, You Become the Emperor of the Empire?

The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised.
A world of the Middle Ages: conquering knights, dragons, demons, gods, pirates, and behemoths…
A barbaric, ignorant, backward, and apathetic era. Starving corpses litter the lands, and the people suffer in misery…
Damn it! I’m going to shatter this era with a single punch!!
Clearing wasteland, farming, building bridges, paving roads, mining coal, and extracting ore!
Grinding EXP, recruiting Apostles, and forging an army!
Mass-producing troops! Sweeping across the continent!

Hell yeah! My tide of steel is invincible!!
Roman: “I am your destiny! All of you, kneel before me!”
So you were told to farm, but how did you end up building a vast empire and becoming the Emperor?