Logically, even if they were at some treasure location, there still wouldn't be no one around, right? Minutes later, Mo Wuji eventually decided that no matter what happened, he would have to stabilize his cultivation first. There were also the things in the ring that he needed to rearrange: some treasures that he wouldn't use would need to be placed in his Undying World and he still needed to refine that pagoda treasure.
A few breaths later, Mo Wuji reentered the Undying World. The surroundings had finally calmed down from the ruckus caused by Mo Wuji's tribulation and fire evolution.
When he returned to his Undying World, the first thing Mo Wuji did was to take out the jade box which emanated metal-type energy. Previously, he didn't dare to open it in front of everyone else because he suspected that it was a Metal Elemental Bead. If it was really a Metal Elemental Bead, then that would mean that his Undying World could evolve once more.
