Gloomix

Gloomix is a power-up introduced in Season 2.

Overview
In order for the Trix to be able to defend themselves during their escape of the Fortress of Light, Darkar bestowed Gloomix upon them, giving them a boost. It is magically opposed to Charmix.

Appearance
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 three more Gloomix jewelry pieces that can be seen on them: a yellow hip adornment and two yellow leg bracelets.

Magical Abilities
Being made from Darkar's magic, Gloomix amplifies the magic of its user exponentially. It also allowed the Trix to fuse and become Mega Trix.

Trivia

 * The name "Gloomix" is derived the word "gloom," meaning "darkness, dimness, or obscurity".
 * So far, Gloomix and Dark Sirenix are the only witch powers/levels that are named.
 * Gloomix, Amplified Form and Shape-Shifting Witch are the only Witch Forms to not make an appearance in the comics.