City of Sin - Book 1, Chapter 19

One day, when a novelist woke up from a restless sleep,he realized that he had transformed into his 12-year-old self.

The protagonist, a renowned gamer/YouTuber aka [TorchDancer] is a master of the game “Tril Trilo Trilogy.” When offered a chance to playtest the prequel, “Part 0,” he jumps at the opportunity. But a twist of fate plunges him into the game itself, transforming him into the series’ ultimate villain, Frank Wonderstein. Trapped in a monstrous body, he must navigate a dangerous world, unraveling the secrets of the game and his own destiny. Can a hero become a villain? Or can a villain find redemption? Well, you’ll just have to read to find out.

Jiang Pengji got something called the Court Intrigue Stream System.
System: “Your goal is to become the most prestigious woman in the kingdom (the Queen)!”
Jiang Pengji: “Okay, System. No problem!”
Years later, she met the target by becoming the most prestigious woman (the Empress).
Jiang Pengji: “Well done, no?”

[The false necromancer has insufficient soldiers and is being ostracized and hunted. ]

[The real necromancer, countless skeletons, become the overlord of one party. ]

After Wu Heng obtained the double portal, he discovered that the original world was full of zombies.

When a gangster’s plan fails, another plan to survive begins.

Wu Heng chose to become a ‘Necromancer’.

Is it not allowed to summon the undead from another world? In the last days, the entire planet is a source of soldiers.

Can’t survive in the zombie world? Then I will live in another world and learn skills.

From then on, an undead army equipped with modern weapons appeared in the world.

Natural disaster strikes, millions of skeletons.

Immortal Bone Dragon, King of the Undead.

(Double portal + necromancer + magic + fantasy world + undead natural disaster.)

- Description from novelbuddy