"Yeah, if that works then it eliminates the concern about fairies stumbling through the gates and the only thing left is the convenience of not having to quadruple-layer every gate. If someone wanders into the mortal world and finds that they can cast there, that's a pretty big problem all by itself and I wouldn't be particularly worried about them gating into the hub in particular... to be honest, if someone wanders in the mortal world my two main worries are that they might take a fancy to conquer the galaxy and end up starting a huge war, or that they might end up under the control of a mortal who, in turn, takes a fancy to conquer the galaxy and ends up starting a huge war. Our gate hub wouldn't have much effect on either scenario."