Bog Standard Isekai - Chapter 40Book 3.

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.

Murong Jiu, the Ninth Young Miss of the Marquis Mansion, was ugly and talentless, and her fate was to harm her relatives. She was raised in the countryside from a young age. Due to her exceptional medical skills, she was used by the Crown Prince, who drained her of all her value and then threw her into a deep well to drown.Only before her death did she realize she had been switched at birth. Others were rightfully enjoying everything that should have been hers; later, all her family died for her, becoming stepping stones for the Crown Prince!Reincarnated, she returned like a vengeful ghost from hell, making her enemies tremble with fear, ready to seek revenge for each grievance.Unexpectedly, she unintentionally became the darling of her biological family, which made her retract her sharp edges.As the substitute Princess Consort of Prince Ling, she and Prince Ling were a fake couple, intent only on finding the real father of the child in her womb, yet unaware that the man from that night was right in front of her…

Traveling through the era of national beasts, Su Yi discovered that his pet beasts could actually choose a special evolutionary route!

When others are still trying to make the red fox evolve into a flaming fox, his nine-tailed fox fairy has already fallen in love with Liaozhai;

When others are still trying to make the thorn grass evolve into a thorn tree, his queen of thorns has already suffered from secondary school;

…

Looking at these strange beasts, Su Yi fell into contemplation.

Will I still be a beastmaster in the future?

This is the demon!

- Description from novelbuddy

I accidentally changed the whole world, the resurrection of the dead, genetic variation, recovery of the qi, mountain and seas reborn, land and seas expanded and evil spirits have started to appear.

Ghosts are now commonplace. Some people now have three heads and six arms. Some people have obtained martial arts techniques and ordinary people are now just cannon fodder.

Fortunately, I have acquired an ability which can make various items mutate.

books into martial arts or cultivation manuals,

fruits into precious treasures of heaven and earth or poison that you can only imagine and…

weapons, that can split the earth or gain sentience!

- Description from Novelupdates