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

NOVEMBER, 17 YEARS AND 5 MONTH UNTIL THE STARSPAWN INVASION

"So they agreed," Cael smiled, rereading the unsealed letter in his hands. "Although the test itself is unnecessary, it's a prime opportunity to visit the Northern Kingdoms. Thank you again, Archbishop, for agreeing to help."

The test Cael spoke about was a test to gain a Mage's Mark of a 7th rank mage. Not every king grew to that level of power. Among those few mages who did, Cael was sure that most simply never got an opportunity to test themselves.

After all, that required three other mages of 7th rank to serve as judges. In Cael's case, these could only be kings of Freistaat and Jotunheim, two most powerful and influential of the Northern Kingdoms.

The rest were inconsequential in comparison.

The third judge would be the Archbishop Dommario II, who scoffed with an air of distaste.