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

The Royal Tower-Palace was a place both grander and more subdued than the late Duke Belpaese's tower. It has puzzling architecture with several staircases and twisting hallways. Each room was furnished with furniture and decorations from expensive materials made by a master's hand, and powerful magic hummed everywhere.

Cael recalled that most of the enchantments on the Royal Tower-Palace were made by the king Poe the First, or based on his instructions. Since those enchantments survived even a direct attack from a Starspawn, Cael could only marvel at the dead king's skill.

The guard brought Cael, Ginevra and Mimi to a door in the middle of the tower and whispered a brief message to whoever was inside. A small spell carried this message through the air—a convenient way to pass words to someone in a nearby room.

A moment later, a ghostly voice brought by a similar spell sounded in the hallway. "Let them in and go back to your post."

The high council, part 1