C362 The mystery of three grounds

"What is that place?" Why does it look so much like a big piece of crystal?! " After Thirteenth Elder entered the thatched cottage for a long time, there were still no movements from before. The two of them circled around the thatched cottage, and before long, Sima Yilan saw a crystal-like hole, which he couldn't help but point at, and praise towards Lin Bai