The Girl Raised by the Death God Holds the Sword of Darkness in Her Arms - Volume 1, Chapter 3: Battle of Iris

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

The main character has been reincarnated, and he possesses a system and a powerful treasure. Using these, he plans to create his own universe. Keep reading to find out more.

Lin Yan is a professional car racer who fell from grace after her sister set her up. She becomes an actress for the sake of her boyfriend, who later cheats on her with her sister. Her life, career and relationships reach a slump.

Enter Pei Yucheng, the president of the JM corporation—a multinational conglomerate. He is unfathomable, cold and aloof. At random, he would mysteriously lose control of himself, and Lin Yan is the only one who is able to calm him down. The first time she meets him, she feels an indescribable fear deep within her soul. Unbeknownst to her, they had met each other a long time ago, but she had chosen to forget him…

Soon, something puzzling and strange begins to happen to her. Occasionally, she loses consciousness and ends up in Pei Yucheng’s room the next day, completely unaware of how she ended up there. She suspects that something has possessed her…

Good news: I have transmigrated to Teyvat and become the Heavenly Principle.Bad news: The world of Teyvat doesn’t have much time left.Good news: I have a system that allows me to devour two-dimensional worlds.Noah looked at the countless familiar worlds, tears of sorrow streaming down his face, and announced on the spot:“I will not only be the Heavenly Principle of Teyvat but also the Heavenly Principle of countless worlds.”“So, my rules are the laws.”From then on, one Heavenly Principle and a group of fierce Gods embraced trembling worlds one after another.After devouring the world of Demon Slayer, Teyvat’s lifespan increased by 5,000 years.After devouring the world of Akame ga Kill!, Teyvat’s barriers were strengthened by 100 times.After devouring the world of Inuyasha, Teyvat forms the cycle of reincarnation.…