In LOTR with Harry Potter system - Chapter 397: The Siege of Sauron

A genius inventor dies and awakens in his younger self's body... but not quite. This isn't his original younger self-it's an alternate version from a reality where the supernatural is real.To make matters even more chaotic, he discovers that someone has decided he is the successor to Solomon. Now, he possesses the power to enslave devils. Armed with his intellect and newfound abilities, it's time to spark a worldwide revolution... starting from his garage!---Tags: Neutral-Evil MC (enslavement, selfish MC), Harem (of course), Inventions, Technological Progress, Sacred Gear Creation, AU DxD Universe (part of Dragon's Omniverse).This fanfic is a STEAMROLLER, with the main focus on the MC's development and his technological innovations, as well as their impact on the world. If you're looking for drama, suspense, or epic battles with no real purpose, this isn't the story for you.

In the Province of the Nine Skies, far above the heavens, there exists Nine Galaxies of Astral Rivers made up of countless constellations interwoven together.

For Martial Cultivators, they could form an innate link with one of the constellations, awaken their Astral Soul, and transform into a Stellar Martial Cultivator.

Legend has it that, the strongest cultivators in the Province of the Nine Skies, were beings that could open an astral gate every time they advanced into a new realm. Their talent in cultivation was such that they could even establish innate links with constellations that existed in a layer higher than the Nine Layers of Heavens, eventually transforming into the heaven-defying and earth-shattering power known as the War God of the Nine Heavens.

Qin Wentian is the MC of this story. How could a guy, with a broken set of meridians, successfully cultivate? There were countless Stellar Martial Cultivators, as there were countless constellations in the vast starry skies. What he wanted to be, was the brightest constellation of all, shining dazzlingly in the vast starry skies.

- Description from novelupdates

The weak cry out with all their might, yet no one cares; The strong whisper softly, yet their words penetrate deeply into the heart. A Talent Tree ablaze with flames, every leaf bearing different spirit runes, Lu Ye, reduced to a mining slave after his sect was destroyed, used this to become a cultivator and stirred the winds of change in the Nine Provinces...

Nine heavens and nine earths, there are many souls.

The strong stand in the nine heavens, like shining stars, while the weak creep on the ground like tiny ants.

The young boy Bai Ye accidentally unlocked the mysterious heavenly soul, cultivated supreme soul skills, guarded the soul and sword, rushed into the nine heavens and swept the stars, and the legend began…

- Description from MTL