If he had chosen to absorb a Soul Core for himself when breaking through the Soul Saint bottleneck and used it to advance, then it was almost certain that he would make the same choice again when breaking through Level 90.
But if Huo Yuhao remembered correctly, even someone as powerful as Du Busi had only condensed his second Soul Core at level 99.
Because the Nautilus within the Undead Demiplane itself possessed the ability to produce Soul Cores, Huo Yuhao had conducted quite a bit of research into them.
Only after a lengthy discussion with Du Busi did Huo Yuhao realize how little he had once understood about Soul Cores. He had merely regarded them as a special form of Soul Power.
Back then, Huo Yuhao had thought of having undead creatures skip all the preceding cultivation steps and begin cultivating directly from a Soul Core.
As long as they possessed a Soul Core that could continuously operate on its own, they would no longer need meridians to circulate Soul Power. In that way, undead creatures could become Soul Masters as well.
At the same time, he had discovered the intense instability of Soul Cores and had even considered making them collide to unleash sufficiently devastating destructive power.
In more rigorous terms, this method could roughly be called—Uncontrollable Soul Core Energy Release.
Yet after discussing and learning from several Limit Douluo, he discovered that Soul Cores were nowhere near that simple.
To reach level 99, one needed the support of a Second Soul Core. Only dual Soul Cores could sustain the endless reserves of Soul Power possessed by a Limit Douluo.
The condensation of a Second Soul Core was particularly particular. One could either choose Isotopic Resonance Dual Soul Core, finding the pattern and frequency at which the First