Lovix is a sub-transformation of Believix and the Second Gift of Destiny, giving the girls ice powers. Roxy is not included in this transformation, likely due to the fact that she hasn't completed her Believix.
Preceded by: Sophix
Each Winx starts in her Believix form, then they pose a specific move from the Believix transformation. She then shouts, "Winx Lovix" and then her Lovix power. Finally, she appears on the screen in her Lovix outfit.
Lovix consists of wintery versions of their Believix outfits, with the clothing covering more skin and outlined in fur-like fabric. The wings are jewelled, have no designs or sparkles, and glow around the edges. When the Winx and Roxy were trapped in the Major North Fairy Aurora's palace, the Winx were in Lovix form and protected from the cold, as demonstrated when Roxy began to freeze to death because she didn't have Lovix.