Shikkakumon no Saikyou Kenja

In a world where magical aptitude is determined by an engraved crest at birth, a revered sage despairs at his own mark, believing it utterly unsuitable for combat. Seeking true strength, he makes the ultimate sacrifice: reincarnating thousands of years in the future, hoping for a more auspicious emblazonment. He awakens to a startling reality — not only has his desired crest manifested, but society’s understanding of magic has drastically declined, leaving him with a power considered obsolete by modern standards. Now known as Mathias, the former sage enrolls in a magical academy, ready to prove the true potential of his "unsuitable" crest. What he finds is a world ripe for rediscovery, and a burgeoning conspiracy that threatens to unravel the very fabric of magical knowledge. With his ancient wisdom and formidable strength, Mathias must navigate a new era of magic, battling demons and challenging conventional wisdom, all while uncovering the truth behind society’s lost power.

✦ AI-drafted summary