When you finish the game for first time, Regina will get two new costumes (Battle type, and Army type). If you play through the game twice, you will get a 4th outfit for Regina to wear. It will change her into a cave girl. Almost as though SHE came from the portal. An extra bonus for getting this is that if CHECK her guns at your EQUIP menu, they will have turned to an ancient type weapons. They will still function like normal, though.