Ephtal

Ephtal was originally a great sage reincarnated from modern Earth. Although he became one of the legendary heroes known as the "Emperor of Thunder" after defeating the Demon King, he died in deep regret due to his lack of natural magical aptitude preventing him from reaching the peak of magic. Four hundred years later, he undergoes a second reincarnation as the child of a noble duke's family in an era where magical civilization has severely declined. While he still lacks innate magic aptitude, Ephtal retains all of his past-life knowledge and overwhelming power, making his standard spells appear as legendary "miracles" to the people of this new era. Determined to conquer the pinnacle of magic through sheer effort and unwavering dedication, he enters a prestigious magic academy. There, alongside Anastasia, a slave girl he rescued, and Merlin, his former disciple who is now the academy's principal, Ephtal uses his peerless abilities to shatter the world's common sense. He is a deeply passionate, kind-hearted youth who values justice and loyalty above all, fiercely punishing any corruption while constantly striving toward the ultimate truth of sorcery.