DxD: I know…I'm not the real one,just a cheap copy. but...I'd win - Chapter 8: The Potential of Sacred Energy

In a world of power struggles and betrayal, A hero was once a loyal warrior who dedicated his life to helping his childhood friend ascend to the throne. Through blood, sweat, and unwavering devotion, he paved the way for his friend's reign—only to be betrayed the moment his goal was achieved. His life was cruelly stolen, but fate had other plans.Instead of death, he awakens in his childhood once more, armed with the memories of his tragic fate. This time, he will not be the loyal shadow of a false friend. This time, he will seize the throne himself.Yet, this is not his story.Our true protagonist is an ordinary man who finds himself reincarnated into this world—not as a hero, but as an extra. A mere background character destined to meet a tragic end, a third prince whose death will serve only as fuel for the true villain's rise. Slated to become an undead knight under the fourth prince, the last and most terrifying villain of this dark tale, he must now defy fate itself.With knowledge of the future and a world filled with scheming nobles, ruthless warriors, and an impending catastrophe, can this forsaken prince change his fate? Or will he meet his destined end, only to rise as a pawn in the villain’s grand scheme?A tale of revenge, survival, and defying fate begins now.

This is a story of an ordinary boy gaining unusual powers from his nightmares… It all started when Lin Sheng experienced something strange on what he thought was just another normal day. He begins to have recurring dreams that lead him on an incredible journey of discovery as he encounters spine-chilling monsters and elusive secrets.

- Description from Novelupdates

“Hey monster, you're not ready for this blow, but I don't give a shit!!” said Lian as he drew a circle inside another circle in his mind.Then, a few seconds later, a fireball as big as a house hit a monster just over 4 meters tall...It was a waste of resources, but it was damn fun!“BOOM!!!” he said as the fireball reached the monster, covering it entirely.The excitement on his face was palpable as his clothes and hair fluttered from the power generated by the impact.[Accuracy: 97%]“Tsk, it's really hard to achieve 100% accuracy when casting spells... that just means I have to do better!”Meanwhile, the monster and the entire area around him was destroyed. The crater was huge, flames burned the ground, and ash mixed with dust covered the air.---In a world full of Gates, Mages and Knights work together to defend humanity from extinctionLian, a boy from a small town, awakens a very... unique system.Casting spells by drawing strange shapes in his mind had become normal for him by now.Thanks to the system, he had become a Mage, a human capable of using mana to cast spells.Facing monsters from the Gates had become routine. Studying magic was a pastime. After all, he had the System, he didn't need to study classical magic. Or maybe not...