Master Jiao Da set off, and the others naturally followed close behind.
Once inside the cave, they saw nothing unusual. It was extremely narrow, but after a few miles, it suddenly opened up.
Without warning, a bubble swelled up in the cave. Everyone's nerves tightened at once. They spread out their divine senses, yet could detect nothing. And still, a bubble had appeared.
Everyone knew that bubbles could not simply appear out of nowhere underwater.
Just as everyone's attention was fixed firmly on the bubble, it suddenly expanded, filling the entire cave in an instant. Xu Yi and the others had no room to dodge before it completely enveloped them.
In the next moment, their surroundings changed. They found themselves inside a vast, pure-white building.
Most bizarre of all, the water surrounding them had suddenly vanished.
Master Jiao Da withdrew the barrier from the Water Repelling Pearl, and they felt as though they were standing on dry land.
"Brother Wang, what are you looking at? Is something wrong?"
As soon as they entered, Yuan Tiansi noticed Xu Yi's strange expression and sent him a thought.
Xu Yi replied with a thought, "It's nothing. Brother Yuan, keep a close eye on Master Jiao Da."
He said it was nothing, but inwardly, Xu Yi was deeply shaken.
The entire building was covered in intricate patterns and all manner of profound, mysterious arrays—on the dome, the walls, and the floor.
The others couldn't make them out, but Xu Yi saw them clearly. They were unmistakably complex mathematical proofs.
He had never imagined that the Demon Race, too, had sages who were well versed in the mysteries of mathematics.
"Strange. Where did Old He and the others go? Why can't I see them anywhere?" Master Jiao Da said, looking around.
Even before he spoke,