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This article contains plot details from the latest books.
Squall is a member of the Black Swan's Collective and is a Froster and Conjurer. She is only the only female in the Collective and her disguise is to cover herself in head to toe in foggy ice.
In Lodestar, it is discovered that she is actually Dex's mom, Juline Dizznee. She is often running away from the Collective's events or absent from them because she had to take care of her family.
She joined the Black Swan just after the triplets were born, because Physic was her doctor. Eventually Physic had to step down from the Collective and suggested Squall replace her.