How impressive it is that Lucy, while having the Celestial Spirit King summoned, was able to cast her most powerful magic to take out Jackal. Her actions these past few chapters has really showcased how reliable and resilient she can be, despite all the challenges she encountered, Lucy, with the aid of her beloved spirits, was able to scale those walls and illuminate the darkness with radiating light. The Celestial Spirit King’s Galaxia Blade directed the radiance of the stars onto the darkness imprisoning Fairy Tail, ultimately eroding it away and effectively saving Fairy Tail. With Alegria dispelled, it is time for the rest Fairy Tail to carry on what Wendy, Mira and Lucy gave their all to stop, that is Tartartus.
In a state of grief and sadness at the reality of losing one of her closest friends, Lucy, upon the realisation that there is still a role for her to play in saving the rest of nakama, pushes aside the dejecting pain and channels the power the Celestial Spirit King has bestowed upon her. Aquarius, despite having returned to the Celestial Spirit World, her power now surges inside Lucy and thanks to it, Lucy is able to materialise her resolve of wanting to save her nakama into action.
A spirit of pride, love and strength, to save her dear friend and grant her the power to save the imprisoned fairies she accepts the price of power and the sacrifice required to call it forth. Within the cold waves of her words, an embracing warmth washes over as the tears of realisation and love escape voicing the feelings of her heart, feelings she tried to hide from but never rejecting she had. The Celestial Spirit of Water, Aquarius, through her love for Lucy and her desire to want to protect her, she sacrifices her Celestial Key in order to pay for the power Lucy desperately needs to save everyone, the power of a Celestial Spirit Mage.