Therefore, the Heavenly Demon Spell in Gu Shi Yi's hands remained her first choice. Gu Shi Yi opened the Heavenly Demon Spell, and the first page was a diagram of the energy pathways. Previously, when she learned Taoist techniques alongside the old fellow, she naturally had to learn about the meridians of the human body too. However, the meridians in the Heavenly Demon Spell were completely different from those she had learned about. She found it quite puzzling to understand and, because her demonic power was so weak at the time, she couldn't feel it at all. So practicing it was very strenuous, and after a while, she lost interest.