Toaru Majutsu no Index - Volume 22, Chapter 11: In the Shining Golden Sky. Star_of_Bethlehem.

[Science Eliminates Immortals] Fake Qi Practicing Phase cultivators: Casting fire and water magic, controlling flying swords to decapitate enemies from several tens of steps away, and possessing a shield magic tool for both offense and defense.Real Qi Practicing Phase cultivators: Driving a Type 99 main battle tank, equipped with a 125mm magic tool main gun pulled by Divine Sense, two 12.7mm anti-aircraft and anti-field magic tool machine guns corrected by Divine Sense, nine assorted electromagnetic missiles suspended at the rear of the tank, drawn together by Divine Sense, and four reconnaissance drones, bombing enemies to ashes from 20 kilometers away.Even more real Nascent Soul cultivator: Operating an Air-Space Mothership cluster, with a combat range spanning thousands of miles...

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

A mysterious natural phenomenon caused the Earth to be plunged into darkness. The world turned into an endless bloody chaos and mankind is on the brink of extinction…

Chu Yun Sheng, an ordinary white-collar worker, discovered his family heirloom book shining a bizarre light by accident. Out of curiosity, he tried to study the heirloom book.

After a long research, he still only understood a few symbols written in the ancient book. However, he was shocked when he figured out what messages the ancient book tried to tell him: the sun will disappear, and humanity is doomed…

He tried to spread the message, but no one believed him; his family and friends even tried to take him to see the psychiatrist. Eventually, he gave up telling anyone, but prepared for the apocalypse in secret.

Until one day– the sun really disappeared…

- Description from Novelupdates

Within the Immortal Realm, there were nine thousand major realms, with three thousand at the top, three thousand in the middle, and three thousand at the bottom, along with countless minor realms.