Familiar Spirit
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A Familiar Spirit is a collectable in Rayman Revolution. They are small blue lights that are trapped in cages, and are used to unlock bonus mini-games via any of the three places where Ly is located. For every ten that are set free, Ly's head appears in the game's HUD, meaning that she can open a new door. As Murfy says after destroying a first cage, Familiar Spirits are friends of the fairies.