Dorei Tensei: Sono Dorei Saikyou no Moto Ouji ni Tsuki

Ars was a prince of the Kingdom of Karitz, widely celebrated as the most powerful wizard in the world. Despite his unparalleled magical prowess and royal status, his life was cut tragically short. However, rather than accepting death, Ars utilized his extraordinary abilities at the very brink of his demise. He cast a potent reincarnation spell, ensuring that his consciousness would survive beyond his original lifespan. He awakens in a new life as Wals Sai, a slave who possesses an incredibly formidable physical body. Though stripped of his former royal standing, he retains the vast magical knowledge of his previous existence. This unique combination of overwhelming physical strength and supreme arcane power transforms him into a truly matchless warrior. His new path leads him to serve as the personal escort for a princess from a small kingdom, binding his fate to hers. As threats loom over his new charge, Wals Sai proves to be far more than an ordinary servant. Standing as an unstoppable force, he utilizes his unrivaled physique and devastating magic to crush any enemy foolish enough to stand in their way. No longer a prince but something far more dangerous, the strongest slave rises to protect his kingdom.