After a few exchanges, the three had probed each other's strength and found out where they stood.
"Impossible!"
The Blazing Flame Heaven Severing Demon Dragon King's eyes turned savage, disbelief written across his face. Si Lingxi's strength had exceeded his expectations.
The Great Dark Heaven Heartless True Desire Demon Ancestor's target had always been Si Lingxi, so the heavenly demons had made an estimate of her strength.
As the only Fire Phoenix in this world, she was certainly formidable, but she should have been evenly matched with them. With proper scheming, they could have captured her.
But upon seeing her today, the Demon Dragon King discovered that Si Lingxi had clearly crossed that line.
It was not merely the depth and purity of her magical power. Her profound Dao Comprehension was also enough to support her ascension to the Upper Realm.
With the Blazing Flame Heaven Severing Demon Dragon King's discerning eye, he could see it very clearly. If Si Lingxi wished to ascend, she could take that final step at any moment.
And such a Si Lingxi already stood at the pinnacle of this world. Unless one encountered those old monsters who had accumulated boundless magical power or possessed supreme magical treasures, ordinary experts who had reached the peak would still fall short of Si Lingxi.
Su Aojun and he himself were examples.
Su Aojun's cultivation was already slightly inferior to Si Lingxi's, while he had descended to this lower realm to recultivate and had poured all his energy into cultivating the Four Divine Demon Fire. He was still far from the peak.
Both of them were a step beneath Si Lingxi. Though the two of them joining forces would surely overcome her, it would not be so easy, much less something they could settle in a day or