Warrior Fairies

The Warrior Fairies (or Fairies of Vengeance) are Earth Fairies who live on Tir Na Nog. "Warrior Fairy" is a title given to an Earth Fairy who seeks vengeance against the Wizards of the Black Circle and the humans, or who forms part of the army of Tir Na Nog.

Appearance
Warrior Fairies wear strapped sandals. Their wings are similar to other Earth Fairies'. Their clothing varies in style for each individual fairy, but their clothing is mainly light green, light blue, and purple. They wield staffs to channel their magic.

Pre-Series
When the Wizards of the Black Circle captured them, they were trapped in Tir Na Nog, waiting for the day when they would be free, to exact their vengeance on their captors as well as the inhabitants of Earth who weakened them by not believing in them and whose actions, like war, intolerance, and deforestation were destroying the world they once protected.

Season 4
In "The Enchanted Island," they are seen emerging from Morgana's castle after Roxy frees the Earth Fairies by inserting the White Circle into a stone pillar. They kneel before the Winx, their liberators, but soon become angered at the mention of the Wizards of the Black Circle, and proclaim that they will take vengeance on them. They then follow Morgana and Nebula back into the castle after the Winx refuse to become Warrior Fairies and join the campaign of vengeance against the Wizards of the Black Circle and the human race.

In "Morgana's Secrets," they tried to attack the Winx and the Specialists but were not strong enough to fight them.

In "Ice and Fire," the Winx Club restored magic to the Earth, they helped to restore peace to the planet with the other Earth Fairies under Queen Nebula.

Trivia

 * In the Nickelodeon dub, Diana and Aurora were titled Warrior Fairies of their respective territories.