As Longmin watch his brother recover from the slight injury, he was still beating up himself for letting such a thing happen.
Longmin then turned to look at the Ancient Treasure Palace again. He didn't know the extent of his Dao Eyes abilities, so seeing the Ancient Treasure Palace disappear, he could only speculate that it was as his brother said, an illusion cast by someone's Daoist magic.
But that was as far-fetched as it sounds. This Ancient Treasure Palace has existed for thousands of years, and the number of treasures it bestowed upon all the different disciples within those years was numerous.
Longmin even had a feeling that if he used his Dao Eyes on the other Ancient Treasure Palaces they would appear the same way as this one in front of him.