The Undead King of the Palace of Darkness (WN) - Chapter 2: The Test

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

She was the Eldest Legitimate Daughter of the General's Mansion, treacherously harmed and died a miserable death. Perhaps moved by pity, heaven granted her rebirth. She returned to four years earlier, not only possessing heterochromia that allowed her to see what others couldn't but also equipped with a portable space. She vowed to make those who hurt her and her mother pay in this life.He was a Prince with a Different Surname from Moli Country, holding military power and commanding awe in all directions. It was said that he had conquered most of Moli Country, and even The Emperor showed him deference. Legend had it he was a bloodthirsty prince who killed without blinking an eye.One day, she encountered a ragged but handsome man on the street, who chased after her, shouting, “My wife, my wife.”The woman said, “Damn it, who is your wife? Aunt isn’t even engaged yet! Go where it’s cool and stay there.”The man responded, “You are my wife, and I've decided to follow you for life.”“A feel-good story, both leads are strong, a pampering love story with 1v1 romance.”

Deep Sea, the mental network connecting the Five Continents, is rapidly propelling human civilization forward, but no one knows that eternal night is coming. When the transcendence awakens, the grand buildings will collapse. When flesh and blood are bitter and weak, how can people ascend? The tale begins with an encounter and the receiving of a ruler carrying truth. Gu Shen, an ordinary young man, unveils a corner of the truth about this transcendental world and becomes the largest moth among thousands being drawn to a flame. When the bitter winter comes… I will ascend against the tide, overturn the thrones of kings, shatter the crowns of hypocrisy, and destroy the scepters of injustice. I will become humanity’s final Light Barrier.