User blog comment:BlackWizardZeref/Fairy Tail Chapter 384: Attack of the Celestials Review/@comment-7418318-20140516225538/@comment-24039250-20140516225901

True, but still sacrificing your key keeps her in the Celestial World with no mages to ever claim your key, thus she will never be seen in Earthland. For a spirit I feel that that is one Big Sacrifice.