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This article contains plot details from the latest books.
Frosters are a type of elves with the special ability of cryokinesis. This means that they can manipulate ice particles in the air to freeze whatever they want. In Book 1: Keeper, Dex and Marella were tested at Foxfire to see if they may be Frosters by getting stuck in a very hot room for the whole period. Frosters can also cover themselves with ice as a disguise as seen in Neverseen when Squall, Juline, does it as her disguise. Dex describes Frosters as a useless ability, even though his own mother is one.