Bab 1029: Origin Source

Aurora Continent, somewhere in the Middle Continent. 

Grey stepped out of the portal with a relieved expression on his face. Void was on his shoulder, clearly excited. 

He was about to break through and become a Rank Seven Magical Beast. When a Magical Beast breaks through to the Seventh Rank or the Elemental Venerable Plane is slightly different from a human. Both Magical Beasts and humans develop origin sources, but Magical Beasts awaken a new innate skill. These skills are unique to a Magical Beast and each Magical Beast, even if they are of the same species, has different skills. 

These skills coincide with the origin source they develop, making them stronger. This was why the more powerful a Magical Beast, the harder it was for a human powerhouse to beat it at the same stage. Originally, Magical Beasts are stronger, adding this to their arsenal made them even more powerful.