MTL - Nuclear Power Sword Immortal - Chapter 790 degradation

Xue Xi is forced to fall in love at first sight with this dangerous man on their first meeting. With death being the only other option, she makes the first move:

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.…

Throughout history, Humans have strived for greatness, not only in name but in deeds as well, and many failed to achieve it. It was no different in a Land of Dragons, Mythical beings, Knights, Mages, Demi-humans, and demonic beings. But their greatness came in a different form, a concept known as POWER. The power to conquer, to build, to control, to protect, and to love. Raffaelo Jun was a man born with a silver spoon, yet his sheltered upbringing prevented him from becoming the man he was meant to be. He was unable to achieve the greatness of the prestigious family of the Jun household and became a sight of ridicule. He was used for a while until he wasn’t, then discarded and killed for being a threat to the throne, but Fate had other plans. Reborn as a child, he starts over as the sole son of the Jun household, his actions brimming with intent. He had one goal: attain the power that he once ignored and stand on the precipice of human existence, to protect all that are dear to him. Note: It starts slowly until recent chapters. Interesting side characters, power systems, techniques, and a mixture of variety with the right blend. If you enjoy this work, give me your support, with votes, comments, and reviews :> Check out my new work; WELCOME TO GAMETOPIA!

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