My Wife Is a Grand Duchess

The protagonist becomes the husband of a stunning female archduchess. From then on, he leads the principality in various battles, develops the principality into a kingdom, an empire, and finally unifies the continent. The protagonist gets the system, and with the help of the system, he becomes invincible. A force enhancement card doubles the combat effectiveness of all soldiers and officers under your command. With a healing card, all injuries of all soldiers and officers under his command will be healed instantly. With a charm card, the beautiful woman kneels down and licks the protagonist in an instant. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.