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 shifted forward. "A lead, but not the kind I would like? Did this Enigma steal something else? Something as precious as Ice Flower?"

Instead of replying immediately, Arca launched into an entire story.

"Since there were no leads and no evidence from the scene of the last reported crime—that is, theft of the Ice Flower—I couldn't start the investigation the basic way. Instead, I decided to search the archives of the Church and see if there were other similar cases of theft documented."

Still, Cael listened patiently. Mostly.

"Why should there be? I thought the Church only had the authority to investigate crimes related to heresy and dark magic."

Arca chuckled. "Yes, but copies of reports of notable magic-related crimes still end there more often than not. It works the other way around—there are a lot of things related to the Church in royal archives. I plan to visit them, too, but I haven't had the time yet."

Not a new thing