User blog comment:IamJakuhoRaikoben/Chapter 442: The Law of Space, Review./@comment-5303512-20150630111426/@comment-4933386-20150630133854

well like you said, this entire series is in Ishgal, it's not like they explain where every single magic is being used in the entire Fairy Tail world. The Knight and Celestial Spirit Magic could be just as common. It's just that there's no gold keys in Albareth. Unless they have other unique keys.