Guardian Nymph

Guardian Nymphs are nymphs introduced in Winx Club: The Mystery of the Abyss.

Overview
Guardian Nymphs are guardians of their respective homeworlds, bound to protect them from evil and destruction. These nymphs achieve ultimate harmony with the Magic Dimension. The position of "Guardian Nymph" is forever a part of the aspiring nymphs. The Nymphs of Sirenix are guardians of the Infinite Ocean since ancient times. The Nine Nymphs of Magix were tasked with guarding the Five-Headed Great Dragon that rests underneath Domino in a chamber located beneath the royal palace and watching over his sleep, and are guardians of their homeworld, Domino since the ancient times.

The Nymphs of Domino are the only beings capable of controlling the Beast of the Depths, a creature who wields power stronger than the Dragon's Flame.

Season 6
The Winx fend off the Beast of the Depths and help Daphne regain the confidence needed to transform into her own Sirenix, which she uses to subdue the monster as the Nymph of Domino.

Later, it is revealed that Daphne, as the Nymph of Domino, is able to wield all the elements.

Winx Club: The Mystery of the Abyss
Omnia is briefly mentioned by Icy in her conversation with Tritannus to be the Guardian Nymph of the Infinite Ocean.

Season 7
Issue 149 also implies that Guardian Nymphs may have originated on Domino. In this issue, three young nymphs, Marlene, Janice and Diane become new Guardian Nymphs of Domino.

Known Guardian Nymphs

 * Daphne
 * Omnia
 * Egerya
 * Marlene
 * Janice
 * Diane