Their new training ground
In another part of Ada's world , Mia had chosen to return to the place where the Rune of Transdimensional Travel had transported them, as it was a place far from any civilization and hard to reach for the inhabitants of Ada.
There was no cave here but that didn't matter because Mia, James and Cassy, thanks to their green flames could create anything they wanted.
So while Mia and James' green flames reproduced the same rooms they'd created on Astoria under their feet, Gaia, Cassy's green flame, was busy creating an entrance that would lead them into these underground rooms.
And since everyone was busy, Mia asked Angel and Fire Girl to take care of creating a force field around the place they chose to modify, one that would be powerful enough for the technology of this world not to be able to detect them.