Warlock of the Magus World (WN) - Chapter 1162

He wanted to be accepted for who he was; a bastard. But the world was a cruel place for bastards, especially in the vampire realm of Eldoria.A vampire prince, born a bastard, was a disgrace not only to the royal family but the realm at large. And for that, Gabriel Sinclair grew up in harsh environs within the very castle his brother considered heaven.And as if being bastard was not enough wound to scar him and put him miles away from the throne, they made marry a human to seal the treaty between the two warring species.*****Elena Thornhart always dreamt of venturing beyond the walls of Mysthaven. Since childhood, she had been confined in the castle of Mysthaven, safe from the vampire's reach.But not everything goes as planned. In an effort to save the nearly extinct human population, Andrian Thornhart, the human king and Elena's brother, offers her as the sacrificial lamb.Now Elena must navigate the treacherous Vampire court and royal family and protect her husband from his own kind.Little does she know her presence is set to unleash a side of Gabriel Sinclair that he never knew existed, a secret that might set the realm apart or unite it!

Mystery is the nourishment that keeps me from being ordinary.

It has been 20 years since he came to a world similar to the modern European background. With his early wisdom, Fei Lin learned a skill and finally became a decent person.

Originally thought that he would marry a wife and have children and live this life in a dull way, but found that there is another world under the shadow of the world.

In that world, there are occultists who practice esoteric techniques and master extraordinary powers.

It is weird to spy on humans in the dark and feed on humans.

There are evil god believers who worship the evil god, please the evil god through bloody sacrifices, and exchange power from the evil god.

There is an evil god who wanders outside the world, peeps at the world, and only infiltrates the power of scales and claws, which is enough to cause people to fall.

With the mystery as nourishment, he is no longer ordinary after 20 years of ordinary.

- 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.