In his early years, the Flame Emperor suffered from a dark injury, and although he reached the Sub-Saint realm early on, he was never able to achieve perfection and found it difficult to advance further.
This dark injury was incredibly severe, to the point where even Empress Nuwa was helpless, and the power of the Human Race's fate could barely suppress it, preventing it from worsening, but it could not heal it.
For this reason, despite countless years having passed, the Flame Emperor's injuries remained unhealed. As long as these injuries persisted, he could not achieve perfection and step into the domain of Primordial Chaos.
Even though it was the Flame Emperor who had more potential to advance into the realm of Primordial Chaos than Emperor Huang, this dark injury caused his strength to stagnate, making progress difficult.
