I don't own Justice League or Fairy Tail just any OCs I may throw in and unlike in the prequel so far nothing from the Harry Potter series will be there just mentioned. Justice League shouldn't play any part after Mass Extinction arrives on Earthland.
Erza and Natsu have decided that they are going to destroy the moon. The villagers are excited, but Gray, Lucy and Happy are a bit frightened. Erza devises a plan; she will throw the De-Malevo-Lance, and Natsu will propel it even further with his fiery abilities. A little later, everything is ready and the lance is thrown. The lance appears to break the moon, but, after a few seconds, it is shown that it's not the moon that crumbles; it is instead the transparent dome of glass above them. Such a dome was created by gas released from the ritual; that crystallized and formed the evil lens. This lens was apparently the reason why the moon looked purple, and also the reason why the villagers lost their memories of being Demons.
Erza explains that the villagers were in fact Demons from the beginning, but the dome manipulated their memories into thinking that they were humans. They remember this fact, and also remember their history. This is also the reason why they couldn't approach the ruins. Being of darkness, they couldn't get near such holy light. After these events, Bobo enters the village, and shows everyone that he is actually alive. Everyone rejoices, and spreads their wings, dancing in the night's sky like angels and they decide to have a feast. From the shadows, Zalty sees it all, and using his sphere, he communicates it to Siegrain. He then breaks his transformation, turning into Ultear. Siegrain hopes that Fairy Tail will never interrupt their plans, and the communication is cut.
The morning after their ordeal with the Demon Deliora, Lucy inspects Gray's scar. Lucy says it is permanent, but Gray tells her that he likes it and wants it to be visible. Natsu questions what kind of injury would be invisible, thus starting a fight between the two Mages. As they get ready to leave, Erza speaks to the villagers and says that since the request was fulfilled unofficially, they cannot take the reward money, but out of respect for their new found friendship, they would take the Celestial Spirit Gate key.
They all leave using the ship Erza hijacked, with every villager wanting them to come and visit again sometime. Lyon and his team look on from afar, and Lyon, having followed Gray's advice, asks Sherry if guilds are fun.
At Era, Ultear arrives and meets with Siegrain. They are both disappointed about Deliora's fate, and it's revealed that the daughter Ur thought was dead is actually Ultear. She belittles her mother, but nevertheless, they both think highly of her Magic. Ultear thinks highly of Natsu Dragneel too, and Siegrain thinks that for his plan to work, Natsu must burn bright.
Team Natsu returns home, fretting over the reward. Erza reminds them of the punishment and Natsu, Happy and Gray mention "that". They are so afraid of "that" that Natsu tries to run away, Gray talks to himself, and Happy is in denial. Lucy wonders what "that" is; but she only gets fear in response. She groans as Erza pulls them along. On their way, the group notices a lot of the citizens are looking at them sympathetically, whispering that they haven't seen "it" yet. As the group gets closer to their guild, they see it has been heavily damaged, almost completely torn apart by large metal rods, surging out of the center. Mirajane meets with them and discloses it was Phantom Lord that did it. She directs them to the basement, which was once the storage room. The Guild Master, Makarov, casually welcomes them back and "punishes" them with a simple slap for going on an S-Class job without his permission. Natsu and Erza ask Makarov why nothing is being done about the attack, but Makarov brushes their words off. Mirajane says the attack happened in the middle of the night, so no one was hurt. Makarov uses this fact to make Phantom Lord look cowardly, drunkenly telling them once again that they shouldn't worry about the rival guild. Natsu argues, but Makarov doesn't take him seriously and leaves to use the restroom. Mirajane confesses the real reason why they aren't counterattacking is that it's utterly forbidden by the Magic Council, much to Team Natsu's displeasure.
Later, Lucy returns home only to find the entire team in her house. They say that in this time of war, it's best to stay together, as advised by Mirajane, and they each individually give their own reasons why they came to her house. Lucy reluctantly yields to their presence. They discuss Phantom Lord's attack as well as Makarov and his fearlessness, Gray revealing that he is one of the Ten Wizard Saints, the ten strongest Mages throughout Fiore, their position decided by the chairman of the Magic Council. Happy pipes up that Jose Porla, the Phantom Lord Guild Master, is one of the Wizard Saints as well, and Erza mentally comments that Siegrain was one too. Erza tells them that Fairy Tail and Phantom Lord had about equal strength, but that Phantom Lord had several noteworthy powerful members; their Guild Master, Jose, an elite team of S-Class Mages known as the Element 4, and their very own Dragon Slayer, Gajeel Redfox.