MTL - Bancheng Fengyue - Chapter 8 vengeance

The Ye family’s foolish girl is reborn one day!With an omnipotent divine cauldron and a spiritual space in hand, she is no longer the good-for-nothing, abandoned girl that everyone bullies at sight!She is so invincible with both medicine and poison that even a divine doctor will be nothing beside her, Spiritual beasts beg her to make contracts… Oops, excuse her, even the Beast God calls her Boss.When her scumbag father dares to abandon his wife and daughter, she wrecks and destroys his family.When people dare to bully or humiliate her, she would return that favor a hundred times greater.Reincarnated as a human once more, she returns like a powerful sovereign. However, she never expects to be involved with the devilish and bloodthirsty him.Originally meant to be a decisive Ghost King, he ends up reincarnated into a ditsy, cute and harmless hostage prince in a neighboring rival nation…

John Foster, a top expert in a certain gaming studio, who once offended a trust-fund baby.

As a result, he was framed and bound with the worst talent-“Sacrifice”, in the new game “GODSLAYER” upon the game's launch day.

John was the only one among the sacrificed who insisted on not deleting his character.

Supposed to be sacrificed to The Devil, John persisted in his quest.

After being killed multiple times, he still charged towards The Devil with his flesh and blood!

[Ding: You have been killed, losing 10 points of Weapon and Equip durability.]

[Ding: You have been killed, losing 10 points of Weapon and Equip durability.] ...

After multiple failures, John was surprised to find that his skills and Exp were improving rapidly as he fought The Devil!

A few months later, when players worldwide were busy leveling up, a system notification struck like thunder:

[Ding: 'Anonymous Player' successfully killed the World BOSS - Devil 'Azazel', earning the First Kill reward!]

……………………………………………………………

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500 years ago, Chen Xi was devoured by a crack in the void and was transported into a cultivation world.

500 years later, he returned back to Earth after enduring through several hardships and discovered that only 5 years had gone by.

…

In the courtyard, beauty at the side, a candle flame wavering.

A gush of clear wind, half a full moon, the peach tree remains unchanging.

…

Wait, whose kid is this?! Why is she calling me papa? Gazing at the little girl in front of him with skin as pale as jade, Chen Xi froze.

…

　
Returning home from cultivation, starting as a stay-at-home dad.

In this life, not fighting to be a king nor claiming to be a tyrant, only praying to peacefully be a wife-pampering mad devil and a child-protecting daddy!

- Description from Novelupdates

A girl who calls herself a demon appeared before a timid student named Fumio Kijima. The girl claims to be a campaign girl from the demon world and she gives him the ability to “summon a room” from nothing but thin air.

At first he doesn’t abuse his power and uses it as a convenient ability in his every day life. But one day he is bullied by his classmates under a false pretext and is made to suffer. In the past he would have wallowed in misery and cried himself to sleep, but now he had a power to call upon.

“I will make them regret it!”

Using his powers to summon his “room”, he begins his era of confinement and brainwashing to achieve his goals.