Lucy Heartfilia is one of Fairy Tail's main characters, and its in-series narrator. While the magic of her colleagues is fairly straightforward fare for a shonen anime, Lucy's Celestial Spirit magic is a bit more mysterious, and has fewer analogues in other series. '
As Fairy Tail's anime is set to return for an adaptation of the sequel manga, 100 Years Quest, now's as good a time as ever to examine how Lucy's magic works.
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The Celestial Spirits are powerful magical beings who inhabit their own separate world, the Celestial Spirit World. Each Celestial Spirit (except for the extremely powerful Celestial Spirit King) is named and modeled after a real constellation. Celestial Spirit Mages like Lucy use their magic power to summon these spirits to aid them in battle or perform other useful functions. This is usually done through the power of Gate Keys, which are each attached to an individual spirit. Lucy has been shown to summon her spirits without gate keys in Elentear, a world with excess magical power, but is otherwise forced to use the keys as a medium.
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Gate Keys are divided into three known categories. Silver Keys represent lesser constellations and are relatively common. The spirits attached to them are weaker, and some are only used outside of battle. The total number of Silver Keys is unknown, but they are greater in number than the much rarer Gold Keys. There are twelve Gold Keys in all, each representing a different constellation in the zodiac. Each of the Zodiac spirits carry power parallel to those of experienced wizards, and are entirely sentient, with their own unique personalities.
Lucy currently possesses 9 Gold Keys, belonging to
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