Aria is happy that Arthur has advanced so much in his cultivation and sees his enthusiasm to get even stronger; she wants to help him on such a journey to the top, but she can't stop thinking about the method he's going to use to do it.
Still, she tries her best to be a good mother, starting by teaching him his first spell. "I never imagined that your first spell would be this, but it's better that you have control over it," she comments while gesturing her fingers in the air, creating a gray circle with lines and symbols that Arthur doesn't recognize.
"This is an enchantment, created with specific lines and ancestral characters," Aria explains as she finishes the drawing in the air. "Enchantments are one of the easiest types of magic to use; you just need to channel your Astral Energy from your Astral Pond to the tips of your fingers and let it out slowly; if your Energy is powerful enough for that spell and you draw it right, the enchantment will work."