If the Heavenly Underworld Old Demon truly intended to use the blood essence of these Heavenly Underworld Sect members to fuel his breakthrough, then once he became a Dou Sheng, he would be an extremely troublesome opponent.
Although only a hair's breadth separated a Dou Sheng from a high-level Half-Saint, the gap was even greater than the gulf between a Half-Saint and a Dou Zun.
Once the Heavenly Underworld Old Demon became a Dou Sheng, even Xiao Yan's Six-Colored Fire Lotus might not be enough to kill him.
After all, although the Six-Colored Fire Lotus was immensely powerful, a Dou Sheng Expert's speed and command of space and energy had reached a terrifying degree.
If he deliberately dodged, Xiao Yan would be lucky if even a tenth of the Fire Lotus's power struck him.
At that thought, Xiao Yan's expression turned exceedingly grim.
In that case, killing the Heavenly Underworld Old Demon would probably require Old Ancestor Huoyun and the Pill Tower Grand Elder to intervene.
But that would leave Xiao Yan owing a considerable favor.
"No, this blood essence might be immense, but it's also extremely impure. No matter how far the Heavenly Underworld Old Demon lowers his standards, such a muddled mass of blood essence could never let him successfully break through to Dou Sheng."
Xiao Yan suddenly recalled that breaking through to Dou Sheng required more than simply an enormous amount of energy. That energy also had to be exceptionally pure.
But if he was not using it to break through to Dou Sheng, just what was the Heavenly Underworld Old Demon planning?
Xiao Yan pondered it from every angle but still could not find the true reason. Yet he knew he had to interrupt the Heavenly Underworld Old Demon's plan as quickly as possible, or an