The Ossan Newbie Adventurer, Trained to Death by the Most Powerful Party, Became Invincible

It is common knowledge that it is best to become an adventurer when you are as young as possible because the magical power that is the basis of an adventurer's strength will hardly grow if you don't train it while you are young. But this man, Rick Gladiator, who became an adventurer when he was over thirty yea…