The Arctic Faries are the Warrior Fairy followers of Aurora. They have pale skin and wear artic clothing with wings like icicles. It has been stated before that fairies cannot withstand the cold but the Arctic Fairies along with Aurora are quite at home in the cold and can harness their winx/magic from it. Some were able to summon a spell that fired ice shards from thier hands.
When Aurora planned to trap the Winx Club in her Ice Fortress she had the Arctic Fairies escape but they soon returned back when the fight was settled and even helped to restore the missing fairy magic to earth.