The King’s Game - Chapter 128 - Heart Of Machinery XVIII

After dying in an oddly anticlimactic vending machine accident, Kazuki Ren is reincarnated in the demon realm—not as a hero, not as a villain, but as the only human male student enrolled at the mysterious Academy of Ruin, a school where all the professors are demon lords and all the students are powerful, beautiful she-demons.Ren is told he has one task: survive.But there’s a catch. The Academy’s darkest secret is about to awaken, and Ren holds a hidden power that could either destroy the demon world... or rule it.Now surrounded by seductive demons with hidden motives, eldritch tomes, forbidden dungeons, and twisted exams, Ren must master his ability—or be consumed.Magic, mystery, danger, and temptation await in this dark academia harem fantasy.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

This is a story that follows the courtship between a stone from Hell and a god from Heaven that begins in the underworld and spans for three lifetimes in the mortal realm.

The challenges a female cultivator had to overcome on her life journey were countless.

She mustn’t be lacking in talent, cultivation techniques, medicinal pills, and magic weapons. Otherwise, her cultivation would progress too slowly.

She also mustn’t have too many emotions, weaknesses, kindness, and greed. If she had too much of them, she would soon be saying hello with death.

Moreover, she must look neither too pretty nor too ugly. Although she mustn’t be stupid, she also couldn’t be too intelligent.

Being a female cultivator, Mo Tiange naturally had to face those challenges. Nevertheless, being orphaned from a young age had toughened her tenacity and resilience. Neither having what were deemed as waste spiritual roots nor limited resources could deter her spirit. Staying as inconspicuous as possible but never let an opportunity go was her daily life. Follow Mo Tiange as she embarked on a journey to survive and achieve immortality in the harsh and merciless cultivation world…

- Description from Novelupdates