Blizzard (Power)

The Blizzard is the source of Aurora's magical powers.

Overview
The Blizzard is a very potent form of ice magic under the possession of Aurora, Major Fairy of the North. According to legends passed down through generations of Earth Fairies, the Blizzard is said to possess the ability to freeze over the entire universe with just a single drop of its magic. Additionally, only those with the coldest of hearts can touch it.

As such a crucial and dangerous magic source, Aurora keeps the Blizzard within the heart of her Frost Tower where she dutifully protects it with the help of her faithful followers, the Arctic Fairies.

Season 4
The Blizzard is first used in the episode "The Frozen Tower" to freeze over the Earth under the orders of Morgana, the Earth Fairy High Queen, after Diana, the Major Fairy of Nature, was defeated by the Winx and defected from their Age of Vengeance. This forces the Winx to head for the Frost Tower to confront Aurora and put a stop to her spell before the world entered another Ice Age.

Eventually, the seven fairies reach the heart of the Frost Tower, where they confront Aurora. Also in that instance, Aurora shows them the Blizzard, declaring it to be her power source while admitting that, even with it, she could never stand a chance against the fearsome power of the Dragon's Flame within Bloom. To work around this, Aurora had purposely let the Winx into the heart of her Frost Tower so that she could trap them inside as she lowered its internal temperature and sent the Arctic Fairies after them to wear them down until their eventual defeat. Even after the seven fairies defeated her followers, Aurora trapped them within a cage of ice and snow, leaving them unable to escape until Bloom made a deal with the Earth Fairies: that she would combat Nebula, their strongest warrior, for her friends' freedom, Roxy's safety and, more importantly, for the Earth Fairies to denounce their Age of Vengeance should she come out as the victor.