Claimed by My Ex's Half-Brother - Chapter 199 What exactly happened here?

This is the story of an average normal nobody, who one day got reincarnated in a book that he read in his teens.

At first he felt happy that finally something unexpected happened in his life, but that happiness was short lived as he remembered the plot of the book and the crisis that was coming for the world, and who he was supposed to be - THE FIRST FALLEN - THE GREAT DEVIL.

Just remembering how he was supposed to end up in the novel sent shivers to his spine.

Can a nobody survive in a world where dungeons, towers, monsters, magic, immortals, Gods and demons exist. how can he survive when the whole world is out for his life, and the Gods he prays too are laughing at his stupidity and betting on his death.

Follow his journey as he tries to find new NORMAL ways to survive while ignoring the plot and the protagonist.

At least that was his plan until he heard a very familiar voice -

[DING] [TING] [TIDING]

[FINALLY , FOUND YOU. ]

[DID YOU MISS ME??? ]

“A ROMANTIC ADVENTURE FILLED WITH MYSTERIES AND SOME OF THE BEST REINCARNATION AS EXTRA/VILLAIN PLOTLINES.”

……………………………………………………………

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A world where the [Demon King] was defeated by a [Hero] that came from another world. People carelessly forgot about their fear of the [Demon King] and of monsters, living in peace.

In a forgotten and run-down cave in the mountains, a new monster that should not have been born was given birth.

The monster’s name was the [Black Ooze]. It was nothing exceptional other than its black color, an ordinary slime.

However, this slime had the special characteristic of being able to take the abilities of the living things it swallowed. It preyed on an insect that had paralytic poison, as well as other animals. Following that, it attacked a human, obtaining his knowledge and [Desire].

Before long, the monster established its target as the female mage that came to explore the cave.

This world still wasn’t aware.

William watched his family get slaughtered at the dawn of the Apocalypse.A demon placed his brother’s beating heart on his lap before death claimed him.for reasons unknown to him, he woke up inside a novel with a strange yet powerful system bound to him.“For all the demons in existence, I will be their End”“or the one behind the apocalypse, I will become the apocalypse itself”----------------------PACING: Stakes will be high, pace will be on the faster side.HAREM INFO:#no Yuri and no incest, not NTR, not all women will be part of mc's harem, and the harem will not be a Pokémon collection, every Fl will be developed and will be given attention.DISCORD SERVER (ASK ME ANYTHING HERE): https://discord.gg/8M4SyARCYQ

Follow Chen Ming as he accepts disciples, establishes a sect, and fights his way in a world that deems him a cannon fodder.
He goes against any common sense using his wits and novel knowhow to finish missions and arm himself against his cruel fate.

- Description from Novelupdates