In the underworld sea of Mingdu, when Son of Heaven Yin stood under the Mingdu Heavenly Gate—no matter if the attacks were from Goddess of Heavenly Yin, the Imperial Gate Divine Knife in Tian Shu's hand, or even from the power King Yama borrowed from Fengdu—he couldn't be injured at all.
Emperor's Throne was simply too powerful.
Goddess of Heavenly Yin who had revived learned the three hundred and twenty-four runes of Heavenly Yin World from Saint Woodcutter, and the divine art system of Heavenly Yin World was more or less determined. The power of Goddess of Heavenly Yin's divine arts was also rising in a straight line. Adding the fact that she was a natural born sacred god, her battle power surpassed even Tian Shu and King Yama.
It was because she couldn't enter Mingdu that she couldn't cause fatal injuries to Son of Heaven Yin.