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

Ginevra turned towards the doors. "I can melt the locks if you share some mana with me."

"Easily, Gin." Cael glanced around, trying to sense the correct direction. He felt a cluster of mana behind the left door. "Do this one."

He put a palm on her shoulder, and without wasting words, Ginevra chanted the spell. It wasn't one Cael heard before, and he scrupulously put it to memory.

"<The power of the forge at my fingertips, I command the metal to bend and twist. Yield to my power, o' steely form.>"

Ginevra's hand pulsed with magic when she finished reading. She put a finger to the keyhole of the door, and a couple seconds later Cael felt the smell of singed wood fill the air. But nothing burned, thankfully. Instead, the lock grew first red, then white, and then flowed to the floor.

Ginevra put the hand away and pushed the door open before metal would cool down and block it again.

Teamwork