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For the related Magic, see Celestial Spirit Magic. Celestial Spirits (星霊 Seirei) are magical beings from their own separate universe, the Celestial Spirit World. Some Mages, called Celestial Spirit Mages due to their specialization in Celestial Spirit Magic, are able to summon Spirits by opening their Gates via the use of Celestial Spirit Gate Keys. These Keys are separated into two classes: the more common Silver Keys and the extremely rare Gold Keys. Keys for Celestial Spirits are counted...