[@Gayspacerock]
These are questions. As far as I know there isn't a movie involving the hollow cave (but I think thereally should be) yes the cave pixies are born the same way as the other pixies. Like the winter fairies (in Secret wings) the cave pixies have their own ruler. She will be introduced in the first post. Yes they left the hollow be a use their abilities were darker then everyone else's. They are accepted as a necessary evil but most avoid them when possible. They share dust with the others (but there might be a secret involving that later).