Battle of the Shadow Palace

The Battle of the Shadow Palace is an attempt by the some of the Magic Knights led by Yami Sukehiro, Jack the Ripper, Nozel Silva, Fuegoleon Vermillion, and Mereoleona Vermillion to stop the Elves Reincarnation Plan which later turned into a fight against Devil (Kotodama Magic) who attempts to enter the normal world in order to wreak havoc.

Prologue
The Apostles of Sephirah perform a magic ceremony in order to open the Shadow Palace in order to remove the Wicked Heart effect from the Reincarnation Magic in order to complete it as well as banish the souls of the people they already possess. While the Elves who possessed Gauche Adlai, Marie Adlai, and Dorothy Unsworth stayed behind to deal with the humans while the others head in, Yami and Jack instruct the Black Bulls to deal with the threat while they head into the Palace. After the fights Asta, Grey, Gordon Agrippa, and Henry Legolant vs. Drowa and Eclat and Vanessa Enoteca, Magna Swing, Luck Voltia, Charmy Pappitson, and Sally vs. Reve, Asta with a group comprised of himself, Noelle, Mimosa, Fuegoleon, Mereoleona, and Nozel head into the Shadow Palace to confront the Elves and stop their plans.

Beginning
Asta and the others begin to notice the fluctuating magic around them around them as they move into the tunnel. Asta and Mimosa land in one of the lower areas of the Shadow Palace with Mimosa healing Asta to get him back to full strength and making a guide map of the whole Palace and how there are Elves in most of the rooms. Asta and Mimosa encounter Lira, the elf that has possessed Rill Boismortier, and try to talk with him who refuses to listen to anything they say. Lira remarks how Rill's Painting Magic is far more effective than his Scribble Magic allowing him to create elaborate, deadly paintings to attack the duo. Meanwhile Noelle encounters a revived Fana, Mereoleona fights a revived Vetto, and Fuegoleon fights a possessed Kaiser.

During these fights, Yuno arrives at the Capital with several magic knights in order to assist the Black Bulls in their fight against the Elves. Charmy approaches Yuno and gives him some food in order to help him recover his mana. She then goes with him to the Shadow Palace with Nero failing to stop them from entering the palace with Yuno's necklace. Charmy ends up being separated from Yuno and arrives at Asta and Mimosa's fight. Lira starts to panic with him noting his destructive paintings and how he never wanted to make these destructive creations. Charmy approaches Lira with food attempting to calm him down but he knocks the food out of her hand enraging Charmy who attacks him with Strike of the Sleeping Sheep. Lira knocks Charmy aside but then notices CHarmy changing into a taller slender version of herself recognizing her as a Dwarf-Human Hybrid. Asta is informed by Mimosa of the Dwarves disappearance and Charmy is freaked out by the revelation of her blood along with her Sheep actually turning out to be a Wolf which is a manifestation of her second magic attribute, Food Magic. This magic allows her to consume Lira's magic giving her enhanced strength putting Lira at a disadvantage and helping Asta and Mimosa move onward. The two find an unconscious David Swallow possessed by the elf Baval and learn Yuno arrived in the second top most room with there being two elves in the room with him. Rhya, Patri, and Ronne confront Yuno in the room and demand he hand over his amulet to complete the reincarnation spell. Yuno uses his Mana Zone against the trio to try and defeat them but is unable to injure them and his amulet is taken by Ronne using his Switching Magic. However, Rhya notices something off about Ronne and questions who is actually talking at the moment. Ronne then has a devilish smile on his face and blasts a giant hole in Rhya's stomach.

Revelations
As Rhya collapses from his wound, he thinks back on how he kept up the lie that Lumiere betrayed and killed the Elf Tribe in order so the others would continue hating the humans. Rhya remarked on how he wanted to see the others especially Licht again noting that this lie made his moniker of "Disloyal" quite fitting. Patri runs over to heal him and starts to ask Ronne what is going on. Ronne moves over to the stone tablet and places the amulet on it which causes black substance to form from it with something leaving Ronne's body and entering the substance saying it is home. Yuno, Patri, and Rhya all are freaked out by the being which is shown to be a devil. The Devil remarks how he finally was able to regain a body and plans to complete the rest of his plan revealing to Patri that it was not Licht who activate the Reincarnation spell but he himself along him being the one who encourage the Royal family from 500 years ago to destroy the elves. As Patri launches his Light Sword of Judgment at him, the Devil tells the swords to return with Yuno barely being able to save him from the incoming attacks to save William Vangeance's body from harm. Yuno and the arriving Asta try to attack the Devil but he effortless pins the two to the ground while impaling Patri on iron spears all using his Word Soul Magic. The Devil points out that Licht never wanted revenge on humanity and that Patri helped the Devil's plans go through without fail. Despite his desperate pleas for all of this to be a lie, Patri screams out in despair at the fact that his actions were not for the good of his people with the Devil gloating at how he has made the Elves and Humans into his playthings with Rhya apologizing to Patri for not stopping him in the past. Though Asta and Yuno get up and attack the Devil, they barely do any damage to him and he takes Patri's Grimoire, which had become a five-leafed one due to Patri's despair for his purposes. Using Patri's new found grief as an advantage, he causes Patri to become a Dark Efl and has him attack Asta and Yuno while he leaves for the outside world. The duo are effortlessly pushed back by Patri's increased strength but they are saved by Nozel who uses his Mercury Magic's elemental advantage over Patri's Light Magic along with Patri's lack of thinking as Dark Elf to easily defeat and restrain him. Rhya starts to pass away remarking how he failed both of his friends but is saved by Mimosa who is able to help close up his giant wound. Though Nozel wants to finish Patri off for his previous actions, Yuno and Asta convince him to let him live out of concern for WIlliam and to Patri out, respectively. Using Asta's Demon-Destroyer Sword he tries to dispel the reincarnation but is instead drawn into Patri's mind where he sees all that Patri is thinking of and done including his recent killing of Julius Novachrono. Patri, still represented as his younger self in his mind, reflects on all that he has done but still tries to blame humanity for his people's destruction. Asta soon confronts him about his attempted attack on the capital which he used to kill Julius along with his reincarnation causing damage throughout the country. Asta tells Patri that despite his anger towards him, he wants him to stop running away from his issues and try to stop the Word Devil from causing more pain. This along with Asta's statement that even if you aren't forgiven for your mistakes that you can still move forward helps Patri break out of his Dark Elf form.

The Word Devil soon makes it to the top floor where Licht, still in a semi-comatose states confronts him and soon Yami along with Charla(who is possessing Charlotte Roselei) join in to help him.

Epilogue
After escaping the Shadow Palace, Patri allows Asta to dispel the Reincarnation on himself thus allowing William to reawaken. William and Licht perform a combo spell which connects all the Elven souls to a tree which allows Asta to dispel it. All the Elves leave their bodies except Rhya, Vetto, and Fana due to them being affected by the spell twice. Licht encourages the trio live their lives out for the rest of the people and thanks Yuno for allowing him to fight alongside his son in a way. Before he leaves, Asta tries to give Licht his Grimoire back but he tells Asta that it belongs to him now and tells him to take it with him wherever he goes.