To trigger these changes, a character must target their desired arte within what are called Fields of Fonons, alternatively known as FOF Circles, which take on the forms of ring-shaped auras on the ground. There are six possible FOF Circles, one for each element: Earth, Fire, Wind, Water, Light, and Dark. FOF Circles only last for only about five seconds, so for spells that require longer than that to cast, the FOFs will have to be carefully created. Enemies, both boss and generic, are capable of performing FOF Changes as well.