Ur vs. Deliora

 is a battle fought between Mage, Ur, and one of Zeref's demons, Deliora.

Prologue
Gray Fullbuster recalls the events that led to Ur's disappearance from the world and Deliora's sealing.

Ur, Gray and Lyon Bastia were on their way home from shopping in a town when they overheard some travelers discussing Deliora appearing in Brago. This shocked Gray as Deliora destroyed his hometown and caused his parents' demise before. Motivated by his need for revenge, Gray set out alone towards where Deliora was despite Ur's and Lyon's protests and arguments that he can't do it. Ur threatened to expel him, but Gray shrugged it off and told her that he'll blame her if he dies because she neglected to teach him more powerful Magic.

Battle
The details of the beginning of this battle are unknown.

In Brago, Ur, bloodied and bruised, squared off against Deliora alone as Lyon and Gray were already passed out. Deliora released beams headed towards Lyon and Gray's direction and so Ur cast Ice-Make: Rose Garden in order to divert its attack. Gray regained consciousness and was told by Ur to take Lyon and run. As Gray carried Lyon on his shoulder, he asked why Ur came despite being expelled. Ur replied that she didn't need to chase happiness because she already had it in the two of them, her students, and so she came in order to get that happiness back. Gray noticed that one of Ur's legs have been replaced by a prosthetic ice one. Ur paid it no mind and declared that if Deliora is the reason for his darkness, then she has a reason to fight it.

She ordered Gray to go but he refused as he believed it was his fault. As Gray's tears poured, Lyon regained consciousness. He looked delirious and told Ur that a monster like that was no match against the strongest Mage, her. Ur replied that there are others stronger than her. This seemed to irk Lyon as he stated that if that were true, all of his training was for nothing. He assumed the stance for Iced Shell and said that if she wasn't going to fight seriously, he would. Lyon revealed that since Ur wouldn't teach him powerful spells, he read a Magic book on his own, leading to his discovery of Iced Shell, the only spell that would work on Deliora and would seal it away. Ur froze Lyon on the spot in order to stop him because she knew that Iced Shell ruins the user's body. However, she assumed the stance for the spell herself, stating she planned to use the same spell on Deliora.

Ur unleashed her Magic and cast Iced Shell. Gray watched Ur's body crack and transform as this Magic turns the user's body to ice for all eternity in order to seal something or someone else. Before turning to ice completely, she asked Gray a favor: to tell Lyon she died because if he discovered she merely became ice, he'd spend the rest of his life trying to undo that spell. Ur proclaimed that she wanted both of them to see the world and step into the future. As Deliora became encased in ice, Ur sealed Gray's darkness.

Aftermath
Lyon woke up the next day to see Gray crying and Deliora fully sealed. He became enraged and accused Gray of killing Ur and making him unable to fulfill his dream of surpassing her. In present day, Gray breaks through the ice surrounding the temple room where Natsu Dragneel and Lyon battle. He assumes the position for Iced Shell and states that he and Lyon shall both undergo punishment.

Later, after Lyon's defeat by Gray and Zalty's defeat by Natsu, Deliora is freed from its ice case via the Moon Drip. Gray attempts to cast Iced Shell and seal it again. Natsu then steps in to stop Gray as he proposes to fight it himself. However, they discover that there is no need for that as Deliora crumbles to dust before them. Deliora has been long dead and that was its final moment. In all the years that it was in Ur's ice, Ur had been working to drain its life energy. They all look on in amazement at Ur, who Gray believes is still alive as part of the ocean.