Gadorf had met the Master only a few years prior. Unable to assume a human form, the only way he had to acquire new techniques and materials was stealing them.
Even if descending from the bloodline of an Evolved monster granted him the use of true magic on all six elements, the wyvern was still too weak to attack a major noble family or important merchants.
Gadorf had already nearly got killed multiple times after raiding small cities. The Association responded quickly to threats, sending several mages at once to deal with him. Gadorf managed to survive only thanks to his mastery of light magic and arrays.
In over two hundred years of practice, he had reached a level in those fields that very few mages could even start to comprehend. It was exactly because of his stubbornness that the Master had taken interest in him.
