Known as "Gaius" in his previous life around 5000+ years ago, he reincarnated himself as Matthias in order to obtain a new Crest by his Reincarnation magic, which would be better than his "First Crest". He was able to successfully achieve his goal upon reincarnation in the form of "Fourth Crest". His main goal in life is to gain power so that he could challenge and fight against the powerful Monsters in the Outer Space.