Winx Club Forever
- Previous Transformation: Witch
- Next Transformation: Disenchantix
Gloomix takes the form of a glowing necklace or arm cuff with a single gem on the end that assume the respective shades of the wearer. In "The Phoenix Revealed," when Darkar betrays the Trix and sends them to Oblivion, they merge together into the Mega Trix and two more Gloomix jewelry pieces can be seen on them: a yellow hip adornment and two yellow leg bracelets.
Gloomix multiplies the magic power of its user. It is made from Darkar's magic.
Known Gloomix Witches
- The name "Gloomix" comes from the word "gloom", which means darkness, dimness, or obscurity.
- So far, Gloomix and Disenchantix are the only witch powers/levels that are named, with Disenchantix only being named in the 4Kids dub.
- Gloomix and Disenchantix are the only Witch Forms to not make an appearance in the comics.