The Primal Chaos Sacred Flame ranked the first among the ten heaven flames of Grace Mainland. It was also the toughest one to get.
Previously, when Shi Yan found the Primal Chaos Sacred Flame, it was trying to take the Origin of the continent. Besides the fact that Lao Luo and the Ring Spirit had used the Origin's energy to bring Shi Yan from another universe, the other reason why Grace Mainland's energy was massively reduced was that the Primal Chaos Sacred Flame had absorbed the Origin's energy.
If Shi Yan hadn't discovered it earlier, the Primal Chaos Sacred Flame could have evolved to an incredible level that would have helped it swallow all the other heaven flames.
And then, it could have replaced Shi Yan to become the fountainhead or the soul of the ancient continent.
