Tang Shaoyang sat cross-legged next to the phoenix's remains and started to cultivate, continuing with Heavenly Meridian Opening Art and the Heavenly Body Transformation.
It was Han Taiyang's advice to use the Phoenix's energy to cultivate. He said it would be more effective than using his own Heavenly Energy. He followed the advice. It was fast, but not as fast as Han Taiyang claimed to be.
Based on Han Taiyang's advice, it was faster to open the meridian using stronger energy. That was when he was struck with an idea. He used Heavenly Meridian Art with Chaos Energy.
He previously used Chaos Energy when he opened his meridians, but he converted it into Heavenly Energy first. This time, he used the pure Chaos Energy to open his meridians. As Han Taiyang said, it became faster and more effective.
As he channeled the Chaos Energy, his meridians grew in size and got stronger. His meridians could channel more energy, thereby increasing the speed of meridian opening.
