Using this ability, Sky can change her appearance but she can't control how it'd alter, and she finds it difficult to control the degree of alteration. She can control whether or not the ability activated, but once activated the only control she has is to stop it and revert to her natural appearance. One of her ancestors is known to have expressed this ability through one of his or her Guardians, which then passed through the genes in a limited form, resulting in Nick Harvard's colour-shifting eyes.