Guang Chengzi certainly has reason to be shocked.
His shock is due to his clear understanding of the terrifying nature of Heavenly Will.
The strength of this will has already surpassed any individual in the world except the Holy Dynasty Emperor; even figures as strong as the Regent King or Qin Shi Huang in the past could not fully resist Heavenly Will, only partially counter its power. This is why the Holy Dynasty Emperor is so great.
His ability to wear down the Heavenly Will in his body is not only due to the relatively mild strength of the invading Heavenly Will but also because of his unique state.
Otherwise, it would require a long time, a war of attrition, to slowly erase the Heavenly Will.
The process during this time would definitely be unpleasant.
