Garessta

In this world riddled with strife, where even kids know spells, and powerful mages are nobility, Cael was born with no mana at all. An heir to the family of mages, he was his father’s disappointment, and his city’s laughingstock. But who knew that he had a much different destiny? To prevent a looming catastrophe no one else knows about—to stop the Starspawn. 

“Blood Mage System activated. Greetings, user. I am your Blood Mage System. Consume the blood of powerful creatures to purchase new abilities.”

With that power, Cael will become a hero able to stand against the fate that crushed countless others—even if the world will call him a demon instead.

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Although the novel has a harem and r18, neither are the focus of the story. Cael only has very few (2 right now and at the moment I don't plan on increasing this amount) girls, and there aren't that many r18 scenes. Take that as you may~

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My Blood Mage System

Cael knew at this point that his mission in the Mattoni Empire was coming to an end. It was only a matter of time until the Void stabilized his empire again, and the agreement about peace between him and Cael was still in place as far as Cael was aware.

Though Cael doubted the dragon would think about war now. In the near future, the Mattoni Empire had to spend money not on the army and creating new ejderha instead of killed ones, but on food.

Cael only needed to finalize all agreements and finish some business.

The first of which were Dante's possessions.

The mage had servants and followers—ordinary people. Cael visited his palace and found that he had no students, though—he found no one talented enough to become one. As for personal assistants, they all were killed by the Void's orders, since they were magically modified creatures.

Thus, Dante's palace was confiscated by government officials.

Gordian knot