Elraine Ardygun

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Nika is a being similar to Zeref; as in they are both over 400 years old. From that time, Nika was a queen from a country that tried to oppose Zeref, but she was sealed away in a different plane of existence. During Fairy Tail: Shooting Star, Gai Nagareboshi accidently releases her from her prison after a scuffle with Touma Yamada.