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 watched every fight of the Games so far, but Irmilla's was one of the most interesting so far. In part, because the woman herself was interesting; in another part, because of how, unlike most patrons, she was a part of the fight.

It was subtle, but he followed her slightest movements, and didn't miss the way she touched her bracelet, nor the mana in it. Clearly, it was a communication amulet.

In the arena, Irmilla's team turned the tides of battle to their side. Perfectly coordinating their movements, her fighters changed a situation that seemed hopeless.

First, Irre used an unexpected blast of frost magic, showing that illusions weren't the only thing in his toolkit. While Irre distracted the opponents, Gialla's summons switched directions, taking the flag and carrying it to their winning position.

A turn of events