The Strongest Sage with the Weakest Crest

The world's most powerful mage reincarnates in order to obtain a combat-optimized magic crest, something impossible in his previous life. Born as Matthias Hildesheimer, he is dismissed for having the weakest crest, yet he immediately surpasses everyone around him and begins correcting the world's deeply misguided understanding of magic. The series is a fast-paced isekai where the overpowered protagonist systematically dismantles false conventional wisdom.