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

Niko finally woke up four more hours later, groaning and blinking bleary eyes. Cael hurried to put an antimagic veil around him, ignoring the strain on his willpower it caused.

Cael wished he could say that the mana maelstrom outside almost passed, but he still couldn't sense an end to it. But his protection immediately made Niko appear more awake and alert.

Niko sat up, looking around in confusion. He took in the shelter first, then the campfire, then noticed the second group resting in the shelter. His eyes widened, but he said nothing as he focused on the people nearest to him: Cael and Myrna.

By that point, most people in the shelter were asleep or about to—partially because of the passage of time, partially because of boredom. They had time to prepare lunch and eat it, but some leftovers stayed in a pot over the campfire.

Dreamer awake