When George said that, the fighting desire from Arthur diminished. He had never faced someone or something at that level of power, but based on what George said, and the feeling he had when looking at the bluebird, it was not a fight he could pick.
"Perhaps that is the reason no one got the inheritance yet. Win against the skeleton dragon is not a simple task!"
It all made sense, but didn't that make the inheritance almost impossible to get? Official mages could not enter inside the dimensional realm, so the strongest person there had the strength of the tenth circle.
A tenth circle mage would die with one attack from that dragon. Even if all of them put their hatred aside and combined their strength, it would still be impossible to win against that thing.
The only answer Arthur could think of was that someone who was in the tenth circle somehow advanced to become an official mage while inside the dimensional realm.