C91 Encountering an Ambush in the Cave

Mi Yunfei and the others followed the leaders of the four big sects to the cave. It didn't look like it was naturally formed. Mi Yunfei understood in his heart that this cave must have been dug by the four big sects to test all the participants. There was a large stone door three meters away from the cave entrance. The stone door looked a bit ancient, it must have been hundreds of years ago