[All Philip knows is that Shotaro isn't spending all of his time worrying about him, and that's all he needed.]

Her motives seem to center on us believing in her, and her magic. She said something about that lending to the strength. As of yet, I'm not fully sure why, but I suppose it's more than enough of a motive to drag us all here.

The more people she has here, the more there are to believe in her.