*In case you're not up to speed, Winx Club came back around the end of September. The wizards were like on vaca or something and the temporary enemies(?) are the fairies of Earth Morgana, Diana, Aurora (don't quote me on her name), Nebula, and other less important fairies with no names mentioned. In order to beat them, which they have I think, they need to get their Sofix(sp?) powers which is a temporary power booster like Charmix that are nature based (examples below)
Stella:

Layla:

Flora:

Bloom:

Tecna:

Musa:

to take on Diana and Lovix power booster (no examples available but its their Believix only more "suitable" for the cold weather) to take on Aurora (again, don't quote me on the name) who is an ice fairy. Roxy can't do Speedix, Zoomix, Tracix, Sofix(sp?), or Lovix because there's the possibility that her Believix is incomplete because of how she got it (do I hear Bloom's Enchantix all over again?). Also, this may or may not be true but I've heard that Roxy is Morgana's daughter. Not 100% on that.