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

In the magical world, it is an old knowledge that if you started your adventure journey at a young age. You can get a magical power and you can even strengthen them in this age. But then a person in his thirties proves them wrong. Rick Gladiator, gets that magical power at the age of 30 and also the highest rank of adventurer. He has incredible magical power and living his unimaginable life. He built his team and defeated that adventurer who underestimated him one by one.