Saint Claudius

Saint Claudius the Third was one of the five Saints a title given only to the most powerful of sorcerers. All the other Saints including those martial artists beyond the Grandmaster rank had left the planet in search of ways to break through their current level. Only Claudius remained on the planet as unlike everyone else at the time he was attached to this planet where all of his memories came from. 

Now thousands of years have passed and humans have advanced their technology and the martial artists are what remained of the old era. In this era, only a few used mana instead of inner energy. The reason was quite easy to understand because the mana of the planet had lessened and only a few people know anything about mana.