Kekkanhin no Monjutsukai wa Saikyou no Kishoushoku deshita

Figaro, the second son of a famed aristocratic family, was chased out of the family for being unable to use magic. Left with nowhere to go, he was picked up by an old man who lived on the outskirts of the town. Unbelievably, the old man was a Grand Wizard who saved the world in the past! In this new environment, Figaro awakened to a new power, his body strengthened from absorbing magic essence and being able to use powerful magic using magic tools. But one day, he saved a girl being attacked by bandits and ended getting involved in a national conspiracy—! Source: AlphaPolis