Age Eighty, System Says Marry to Get Strong?

A PhD in engineering transmigrates, Zhao Xian single-handedly conquers a vast empire, but his cultivation is crippled by cultivators and he is imprisoned in the harem for thirteen years, suffering humiliation. On the verge of death, the [Eternal Emperor System] activates! Wooing beauties increases lifespan, expanding territory grants rewards, summoning the Imperial Guard and Western Depot assassins, with a wave of his hand, a million corpses fall. "I have been bedridden for thirteen years. You traitors and rebels owe me and the Great Yong, and today you will repay a hundredfold!" The former deposed emperor awakens, wields his sword, and returns to court, killing powerful ministers, executing traitors, and collecting beauties. Then he steps out of the forbidden land, leads millions of immortals, and establishes an immortal court. Thus, the first eternal immortal emperor ascends, ruling over myriad realms, with beauties of all races in his embrace, and the immortal realm eternal.