Astral

Astral had long since went out to explore Lily's world since she was cut off from the telepathic communication with her, and was now on top of the largest building in the wealthy part of the heroes city.

A city where Lily's grandmother lived. Though it had looked like they had entered this rich part of the city simply by flying overhead that assumption would be wrong.

There's a line in which divides the poor, and the rich, and it's blatantly clear it's for separating the two cities, due to the fact there was a large crater, that moved in a straight line, and when Lily's grandmother walked through it, an invisible force field made a path for her.

But when Lily, and anyone of her tamed tried walking along with Beatrice they couldn't even fall down, because an invisible force field was preventing them from passing through.