I became a god by treasure hunting after arriving 500 years early - Chapter 561 - 411: The Underground Alliance, in Crisis!_2

Fang Ze transmigrated to a world filled with superpowers and became a police. Initially, he planned to carry out his duties diligently. However, by chance, he discovered that his true identity was actually a criminal who had been arrested. The police faked his identity and made him believe that he was one of them. Then, they utilized his remaining memories to solve the case and identify his accomplices. They had set up a huge operation and were ready to capture him and his accomplices at any time! Fortunately, he acquired a superpower called the Midnight Investigation Room. At midnight every day, he could conduct an investigation on a chosen target. During his investigation, not only could he hear the actual thoughts running through the head of his subject, he could also acquire different items based on the value of the information he collected. Some of the items he acquired included: a mushroom that could sustain its host’s beauty forever; a credit card that allowed its users to loan from the future unlimitedly; a loyal assassin troop that lurked in the shadow; a demon eye that allowed its user to pry into the other world; a kobold that could learn and train with double efficiency on behalf of its master; seeds that could be attached to enemies’ bodies to make them puppets; and tapes that could transform human bodies into rocks when applied. In order to resolve his crisis, he collected information and investigated the case while improving his ability and expanding his influence. Unfortunately, he uncovered an even bigger scheme after solving his case. This entire world turned out to be a scheme! Many years later, Fang Ze sat on the throne of the King of Darkness. Accumulated beneath his throne were the countless skulls of his enemies.

In a world where everyone changes jobs, I actually awakened to a unique dual career.

And a life-defying career?

High-quality items to cherish? I synthesize directly.

Cherish high-quality skills? I synthesize directly.

Senior pet cherish? I continue to synthesize, wait, how did this beast girl become so big after synthesis?

Let’s start with the synthesis of three skeleton summoning books…

Synthesis – [Undead Army]

Three more dark staffs to synthesize…

Synthesis – [Death Scepter]

The game competition of billions of races in the universe, our solar system, can we earthlings stand on a broader stage!

…

- Description from novelbuddy

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.

Chen Yan travels between worlds, ending up becoming an honorable prince in a medieval fantasy world. Yet this world was not quite as simple as he thought. Witches with magical powers abound, and fearsome wars between churches and kingdoms rage throughout the land.

Roland, a prince regarded as hopeless by his own father and assigned to the worst fief, spends his time developing a poor and backward town into a strong and modern city, while fighting against his siblings for the throne and absolute control over the kingdom. Join Roland as he befriends and allies with witches and, through fighting and even farming, pushes back invaders coming from the realm of evil.

- Description from Novelupdates