Dreamcloud rock is needed in order to make the teleportation array to travel to the Dreamcloud World Subsidiary Realm. In order to obstruct contact between the Dreamcloud World and the main world, the demon beast clan’s Spiritual Gods plundered most of them. There are only one or two in some ruins left behind by the human clans. However, before Yu Yan's Divine Spark was shattered, she hid her interspatial ring, which has some, in the main world. Unfortunately, It’s several tens of thousands of miles away from Glory City.