The main reason was naturally because they didn't have any reason why they should come out.
City A Base was managed by Mr. Jones while the others were staying in City I Base. The formation that Riya set up for them were not triggered and their lives were not in danger, so the two of them didn't have any reason to go back.
During this period of time, there were already several riots of magic beasts because Riya took the special magic cores.
The fifth rank special magic cores were all kept in her world to be given away while the sixth rank special magic cores were all taken by Riya.
Through the use of these special magic cores, Riya had reached rank 6 late stage. After that, she simply used various resources that they have found within the crack to help her speed up her training.
These resources were far behind the special magic core.
But it was good enough for Riya.
