When he first became a disciple in his childhood, he took an oath not to disobey his master's orders, which was quite normal. His master had passed away six hundred years ago, and the National Master personally buried him along with his sword, seal, and other treasures - who would have thought that six hundred years later he would suddenly reappear and use that oath to make him fight against Little Black Tortoise?
However, it was not the shock that changed the National Master's face, but rather seeing a tall figure on the grassland, carrying a smaller female demon in his arms and running all the way towards Booth Cliff. Still hundreds of feet away, he moved both arms and threw the small female demon toward Booth Cliff.
Little Princess, of course, was not happy, but she had just received several treasures and was itching to find an opponent to test their power, so she reluctantly agreed to follow her brother's wishes and practice on the eight-legged monster!