Edolas 22 Days Ago
Every Fairy Tail Wizard is currently assisting Levy and Lucy in decrypting Spike Knightwalker's research, following Erza Knightwalker's explanation; Jet and Droy have been collecting the necessary materials to recreate the mirror, which includes Lacrimite - a substance made by infusing Lacrima with granite to make it reflective. Although Lacrima is useless due to the depletion of magic caused by King Jellal's reversal of the Anima project, Spike Knightwalker had quantities of Lacrima-based weapons that he used by combining their dead components and igniting them with solar radiation.
Wendy and Erza Knightwalker studied Spike Knightwalker's handwriting and determined that his notes on the mirror project are written in anagrams to prevent raiders from stealing his work and creating advanced versions of his masterpiece. The same applies to his gadgets and weaponry, which was why she and King Jellal had problems with the recreation days ago. Erza Knightwalker did feel foolish about her son's tactical genius to outsmart any minds within Edolas.
King Jellal arrives at the guildhall to deliver notes about the sphere floating in Spike Knightwalker's laboratory and deciphers morse code sounds emitting within. Keywords are: Hell, Grogar, Lord Tirek, Sadistic, Cataclysmic, and Equestria. Everything else is blurred, too comprehensible to understand what other sounds, including one that sends shivers down his spine. It was like demonic laughter or something in nature regarding the underworld.
"Equestria?" Wendy Knightwalker remembers the tales about her husband fighting his counterpart who originated from that world when he fled from the abuse.
"That doesn't sound good..," Erza recalls the many moments her son revealed when he was recovering from the third battle he suffered by the claws of Spike the Fairy when he gained the usage of ice magic out of the blue.
"Oh, why is that?" Lucy pesters Erza and Wendy about Equestria since the two show negative vibes; she wonders if that world connects any relations to Spike Knightwalker's past.
"If you remember Earth Land's Fairy Tail, they have me as an ally and my son, and as you know about my son's horrific trauma, the same applies to Spike the Fairy, who endured hardship. The only difference besides their physicality is one killed their tormentors; the other left them. Spike the Fairy ran from his world, Equestria, and joined Earth Land. Now, here's the kicker. Spike the Fairy said that his tormentors are alive and well; that means when my son sees them, he will snap, in an instant, to kill them a second time without much thought. I believe he'll target their friends and families before ruling their world. If he can use magic in Equestria, that world is doomed. He's very dangerous untamed."
"My husband didn't say much about his counterpart's backstory, only that there's a similarity. I figured out that the names of my husband's tormentors would be the same as his counterpart's. We must hurry before Spike creates unholy alliances to boost his devilish spree!"
Panic empowers everyone to work diligently to recreate the mirror to teleport to Equestria since that's the more logical destination where Spike Knightwalker ended up. The names mentioned by King Jellal gave them more motivation to speed up the process to prevent Grogar and Tirek from seizing control and turning Spike's sadism into a demon of fear.
Edolas Present Day
After many days of deciphering the directives Spike Knightwarker had written, the Fairy Tail Guild has successfully finished their project; however, nothing from what King Jellal and Coco saw is emitting. It's just a regular mirror in that people can see their reflection.
Erza Knightwalker decides to inspect the progress and report to King Jellal about the status when she notices how the mirror is now a replica of her son's creation from the labs. She commands everyone to escort the mirror to Spike's laboratory; Erza has a theory by allowing the mirror to lean on the sphere within the room, the magic that transported her son to Equestria would activate.
The Royal Guards are outside the guildhall, ready to bring the replica to Spike's laboratory and navigate every Fairy Tail Wizard to the palace. Spidy and Windy hold their mother's hands, unsure about the possibility of seeing their father as a demented demon everyone but her mother acclaims him to be by now. They want their father to return home and be a family again.
An hour later. The Royal Guards leans the mirror on the sphere; it illuminates with immense magic power as a portal opens. Screams of agony and bloodcurdling cries echo in the room, causing everyone to cover their ears tightly.
"What was that?" Spidy asks everyone before they can react to the howling cries of a dog before it bursts into flames.
"A victim," Lucy and everyone in Fairy Tail says in unison after having sudden flashbacks of when Spike Knightwalker hunted and slew their friends for information or displayed his rapid dominance to extinguish the last remaining dark guild.
"We have to go in!" Wendy turns to her friends, who are hesitant to retrieve Spike Knightwalker, whether or not he became the demon of fear Erza had mentioned.
"We should leave him and destroy the -" Wendy elbows Lucy's gut and punches her harshly, knocking several teeth down her throat for suggesting to abandon her husband and the father of her two children.
"Wendy!" Every Fairy Tail Wizard stands back from her hostile movements when they witness Lucy losing to Wendy; they become fearful of Spike Knightwalker's influence messing with her mind.
"Look! I didn't ask or beg you guys to help so you could abandon the love of my life! I need him! The kids need him! Believe it or not, you need him for our solar-based technology!" Wendy huffs and puffs with her rant in front of Spidy and Windy; she wants to demonstrate standing up for your family despite the hardship, for love conquers evil every time.
Lucy stands up and remains still, glaring at Wendy for breaking her teeth. "We can't all go in! Otherwise, chaos would run amuck with other factions destroying what we've built! You need to decide who's -" Lucy sees King Jellal approaching the portal.
"I'm going," King Jellal stands next to Wendy. "It's my fault for ushering Spike's presence when he was supposed to be with his family for vacation."
"Sire, you can't go -" Coco sees the seriousness in King Jellal's expression, causing her to silence her speech.
"I'm going, and any wish to join me is more than welcome," King Jellal grabs one of his staves, twirling it since he believes the world is fluent with magic power, which would restore his potency when he was a contender of Fairy Tail's strongest wizards.
"I'm going," Erza Knightwalker says, including Spidy and Windy, since they believe if their father see his kids for the first time, it would ignite the goodness of him to break free from the evil within.
"Obviously, I'm going," Wendy says, wielding her batons and flexing her movement.
"So am I," Juvia is the first among the Fairy Tail Guild to willingly offer her servitude on bringing Spike Knightwalker back home, plus she considers Wendy as her sister than anyone else in the guild.
"I'm in," Jet, one of the strongest wizards in Fairy Tail, has decided to help Juvia since he doesn't want her to take all the glory of succeedingly ridding the demon out of Spike Knightwalker to save the good half.
"Same with me, bro," Droy stands with Jet and Juvia.
"You're not leaving me behind, boys," Levy may not be fond of Spike Knightwalker, but she'll accept the opportunity to decimate the demonic side of him for inflicting years of torment.
"Count me in! I won't back away from this job," Nab stretches his limbs, preparing to unleash his wrath on the demon of fear.
"Alright, while we go to this Equestrian world, I'm initiating Martial Law. All Royal Guards and the remaining members of Fairy Tail are to keep the Royal City secured until we return!" King Jellal commands and directs his attention to the mirror portal. He takes a deep breath, imagining where they'll land and how to solve the dilemma. "Forgive me, Spike Knightwalker, for I shouldn't have asked you to conjure a quick-fix solution to resolve transportation if other worlds were tethered with formidable knowledge to seek anything worthy or demonic."
A Royal Soldier gives Erza Knightwalker her former weapon, a magic spear containing the power of the Ten Commandments. Spidy and Windy hold onto Wendy's hands for comfort and a safe voyage while entering the portal to rescue their father from the demon of fear's clutches.
"Let's go," King Jellal enters the portal first and notices a statue of a crystal dragon holding a heart behind him. He sees his comrades and friends entering the realm through the statue. "Alright, that's the entrance."
"Where are we?" Wendy asks and feels magic power flowing through her body, an experience she has never felt before.
Erza, Wendy, Juvia, Nab, Jet, Droy, and Levy feel differently about their potency in magic power, considering their belief to sense it through their weaponry as in Edolas. Jellal feels like he's back in Earth Land with his sorcery and notices several horses walking near and shouting -
"Fairy Tail Wizards!" Several Crystal Ponies shout in unison; they are thrilled to see the returning heroes that help defeated Midnight Sparkle and her cronies the first time; however, they soon realize that they are not the saviors and are from the Edolas world Fairy Dragon and his friends encountered several years ago.
"No way..," Princess Cadance is stunned to see the Edolas version of Spike's friends, and she's happy to report to the Crystal Castle an unbelievable turn of events that just happened right after receiving a letter from Shining Armor about Grogar's involvement and allegiance to stop Mongor. "Follow me, quickly!"
"Who are you?" King Jellal asks on behalf of the rescue party.
"Princess Cadance, and I know why you are here."