Mistress Of The Evil Forest - Case 100: Advent: The scientist.

A 21st-century tech manager, accidentally thrust into the body of Emperor Commodus—yes, the infamous villain played by Joaquin Phoenix—has one goal: not to die like him.Armed with his wits and a hyper-intelligent AI on a solar-powered laptop, he must navigate the treacherous politics of ancient Rome. Everyone, including his own sister, expects the arrogant, decadent tyrant. Instead, they find a calculating reformer. But as he tries to avert the fall of the empire, he discovers that being a “good” emperor might be even more dangerous than being the monster everyone is waiting for.

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 soul from modern planet transmigrates into the Naruto globe as well as incorporates with Kakashi's soul after the kyuubi's assault. A brand-new experience starts ...

Violet skies, a world undergoing massive changes, a deficient moon, interlinking voids…
When the world experienced a cataclysmic event,the majority of living things ceased to exist. Although humanity survived by hiding in the last safe zones, humans had to face mutated dire beasts and colossal source beasts that could break through the space barrier and enter the earth at any second.
Luo Yunyang, a young man who grew up in those calamitous times, obtained an attribute regulator and set out to walk the path of supremacy!

- Description from novelupdates