I am in Xianxia, ​​I can enter the top-level prehistoric world - Chapter 13 - Xia Tian’s Declaration: "From Now On, My Demon Clan Shall Be the Pillar of the Human Clan"

When humans step into the Galactic Era, the ancient art of cultivation thrives once again.

After a tear in reality pulls Kagari Shuya into a white room he discovers a futuristic interface for reincarnating in a different world. After looking through the different races and skills he unlocks a new race, Lucivault, a type of vampire with none of its characteristic weaknesses. All set to start his life in a new world, Shuya is confused to discover that he is enveloped in darkness. As it turns out something went wrong when he was transported and instead of appearing where he was supposed to, he appeared in an underground cave. Shuya faces untold dangers, runs for his life, before finding his way out of the underground world. After escaping he meets his Shishou and begins to learn to fight with a spear. There is also a cute black cat named Rollo.

Void plane: synonymous with terror and taboo, no one knows how big the void is, because it is growing every moment, and anyone who talks about the void will be shocked.

Void Lords: The voices of the Void plane, the plane’s invaders, conquerors and destroyers; they lead the Void’s armies all the way to war, and when they discover a new plane, they will do everything possible to pull it into the Void embraced by the Void’s reward.

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- Description from novelbuddy

A modern-day antihero, who was infamous for his devious acts, dies in an explosion meant to take down a powerful criminal syndicate. Waking up in a world of sword and sorcery, he finds himself possessing a fragile, powerless body with a strange “System” that seems broken. Initially thinking he's doomed, he learns that by pretending to be weak, he can manipulate others into revealing their secrets, granting him abilities they possess. As he rises in power, he discovers that the System was intentionally sabotaged—by none other than his own future self.