Switch in Magic: Curse of Terea

Maddie Beenit has started her first year at Magi Academy, the most prestigious school of magic in the entire world. Her power? Ice. But she isn't as proud of it as the other students.
From a young age, Maddie has always been afraid of the cold. Torturous nightmares follow her to the Academy and only get worse as time moves on. Her friends are oblivious to this, they too forced into nightmares of their own jarring pasts.
And students begin to disappear along with the appearance of fasting moving, thorny vines. Anything Magi, magical person, they touch has their magic drained by a certain percent and they have the symptoms of dark magic exposure, something that happens when an elemental or good Magi is exposed to much more dark magic than their body can take.
Will Maddie figure out the secrets behind the mysterious vines and disppearing students? What or who sent the vines in the first place?