It was unexpected that after such a long time, he had still not completely refined that drop of essence blood; there was still a residual root left.
Normally, it was manageable. His six senses were clear, and his primordial spirit soul was as solid as a rock. The remnant root of the dark blood could only curl up in the deepest part of the primordial spirit, daring not to stir. Otherwise, he would have detected and erased it at once.
However, at this moment, his mood was troubled due to the failure of the Immortal King Tribulation, causing a sudden surge in his inner demons. This provided an opportunity for the remaining drop of dark blood.
Although it was impossible for it to cause any substantial impact on him, it still shocked Shi Hao!
The vitality of that drop of dark blood was too exaggerated. No wonder it could contaminate and erode the existence of the Immortal King Level, taking more than five hundred thousand years to be completely exhausted.