Lots and lots of magic! And the Guardian Force has to agree to join you in most cases which involves a lot of butt kicking but seeing as she's agreed to join you. Junctioning a GF is the only way that we could have fought and won against the Sorceresses we had to fight. If Quisty was still here, she'd be able to explain it better than I can.

[Selphie takes out a couple more rabbits with ease. It just seems like there's no end to them.]