User blog comment:BlackWizardZeref/Fairy Tail Chapter 384: Attack of the Celestials Review/@comment-7418318-20140516225538/@comment-24403746-20140516235403

I don't understand it entirely (my english isn't that good hehe :P) but I kinda get what your trying to say Nick. But I was thinking like there are multiple Plue like-spirits therefore there could probably be other mermaid (or cow, lion, etc.) spirits to replace a golden key should it die out (like Loke was kinda dying in the beginning of the series) or broken like Aquarius. To eliminate the possibility of the Golden Keys "dying out".