The Strongest Sage With The Weakest Crest Vol. 1 (Light Novel)

Gaius is a sage and the world’s most powerful wizard, but he’s been feeling the limitations of the crest he was born with. In order to change his crest, he goes about reincarnating himself into a new body! Now in a world far in the future, he takes on the name of Mathias and obtains the "Crest of Close Combat," the best crest for magic combat. But for some reason, the crest has become known in this era as the "Crest of Failure"! In this world where time has passed, magic has declined and misunderstanding of magical theories have become dominant. Now, it’s up to Mathias, a boy with the weakest crest and the wisdom of a sage, to turn the modern world’s common sense on its head!
Notice: This book is written in Japanese.