Akuyaku Reijou ni Nanka Narimasen. Watashi wa『Futsuu』no Koushaku Reijou desu! - Chapter 196.1: The Miracle Diva.

True evil needs no reason to exist.

“All living creatures must die, but I wont. ”

Once known as the most talented and knowledgeable scholar/philosopher across three continents, he basked in the praise and reverence of those around him. However, tragedy struck one fateful night when he bore witness to the cold-blooded murder of his entire family. Driven to madness, he embarked upon the path of power, the path of negative energy, and thus, The Great Demon, Badur, was born.

In a single day, a mountain of corpses were stacked, many of which fell to his blade. However, during his final pursuit of revenge, he met his untimely demise. His soul was extracted and cast into the void, where it would endure eternal suffering.

However, his jouney would not end here……

“What do you desire?”

A grotesque creature floating in the void asked while staring at the bruised and beaten soul of a young man.

[Ding!! Host has received Void grade Treasure]

[Ding!! Goal has been set : Attain True immortality]

A new lease at life is presented

A deal with a Demon filled with resentment

A new journey, a new Dawn

With that the great Demon, Badur is reborn

ps: the book won't progress the way other novels have been progressing. if you don't like a unique development then maybe this isn't the book for you.

Easily cowed and bullied, she was the useless, ugly woman with no talent in medical skills. Supported by millions, he was Tianning’s most respected duke with the power to move all under Heaven. On their wedding day the bridal sedan was carried to the front doors, but the Duke of Qin’s gates were shut tight.

They told her, ‘Come back tomorrow.’

All alone, she walked step-by-step full of pride through the duke’s doors. Little could they imagine, this unattractive good-for-nothing was a beautiful, genius doctor of poisons!

—

After transmigrating to the past, poisons expert Han Yunxi finds herself on the verge of being married off to the country’s second most powerful man, the Duke of Qin. Her future life seems set–except her husband is an unfeeling ice block, her in-laws think she’s a eyesore, the empress dowager wants to use her for her own goals, and poison-related plots abound.

Alone, the intelligent (and sensible) Yunxi must carve her own space from the intricate web of court intrigue and the jianghu, relying on her words, wits, and wisdom to survive. Adapt when necessary, use force when required; to survive and thrive is the name of the game to a prosperous life.

No matter what, she’ll prove her right to live!

- Description from novelupdates

# LORDXu Yuan transmigrated to a parallel world where everyone became lords. Initially, he thought he would be a lord too. To his surprise, he became the Dark Demonic Dragon, a starter hero awaiting to be summoned by a lord. He also awakened the Dragon God Cultivation System.[Transformation of the Dark: You can level up quickly by staying in the dark.][Slumber of the Dragon God: For the Dragon God, sleeping means residing in the dark.][Rejuvenation of the Demonic Dragon: You can revive using the power of the dark. Your basic attribute points will increase every time you revive.][The Blade of the Hidden Wings: This is a dark attribute AoE skill. It can annihilate all enemies within the area of effect.][Unlimited Devouring: The skills of your enemy shall be yours now. Unleash this skill to devour your enemy and acquire their skills.]…Su Wan, a beautiful lord, had no doubt that she could easily become the most powerful lord in the universe.She felt her heart beating fast when she first saw her starter hero dazzle amidst the flashing summoning light.Unbeknownst to her, her nightmare was about to unfold.While other heroes devoted themselves to training day and night in order to level up, her hero goofed around and showed no effort to improve himself.While other heroes charged into the enemy’s base and valiantly killed off their foes, her hero hid in their base and slept soundly....As time passed, Su Wan slowly discovered that there was more to her hero than met the eye.

I exist in the darkness, disappear under the bright light, and will eventually devour the sun and turn into the shadow of all things… Known by people as the indescribable terror of darkness; the king of shadows; the dark day; the existence of the shadow of the world , is still just a somewhat special high school student, facing a weird death game…

- Description from novelbuddy