Duel of Merrigod Plateau

The Duel of Merrigod was a face-off held between Elluka Clockworker  and Gumillia and Irina Clockworker and Lemy Abelard. Taking place at Pale Noël's tomb in Merrigod Plateau, Elphegort in EC 611, it was regarded centuries later as a historical event.

Origins
Main Article: Rolled Murders

Following the arrest of Kaidor Blankenheim on May of EC 610, the noble was murdered by Gatt Coulomb in order to prevent the leakage of information regarding Père Noël. As the months progressed, several people involved in Julia Abelard's presidential scandal were murdered by her son Lemy. In December of that year, Lemy was shot by Gumillia as the World Police continued to investigate into the issue. At that time, Julia sent a letter to Elluka Clockworker, revealing her true identity to be Elluka's sister-in-law, Irina.

On January 26 of the following year, Irina resigned from her presidency, fleeing to Elphegort shortly after. Three days later, Lemy was resurrected thanks to his contract with the Demon of Gluttony, rising from his grave. Instructed by the demon to travel to the Cliff of Apocalypse, Lemy acquiesced and embarked on his journey. At the same time, Elluka and Gumillia decided to confront Irina at Merrigod Plateau. Encountering Gatt along the way, the two mages swiftly defeated the swordsman before continuing on their journey.

Beginnings of Battle
Sometime after, Irina entered the cave at Apocalypse Cliff, storing her cat body and the vessels of sin behind the tomb of Pale Noël. Soon after, Elluka and Gumillia arrived at the plateau, and the three began their duel. On January 30, Lemy arrived at the cave's main chamber and saw his adoptive mother throw a fireball in his direction, easily dodging the projectile. Summoning another fireball, Irina then threw it at Elluka before witnessing it burst in an invisible barrier in front of her. In response, the pink-haired sorceress summoned lightning in her hands while her apprentice pointed her gun at Irina.

Lemy then took out his knife and sprinted towards Elluka before being shot by Gumillia, the bullet passing through his heart. Although experiencing pain, the boy was able to quickly recover. Noticing her regular bullets were useless against him, Gumillia loaded her gun with magic bullets, shooting Lemy once again. Irina then propelled another fire blast at Gumillia before her magic was cancelled out by Elluka's lightning bolt. Seeing her sister-in-law summon flames in her hands once again, Elluka prepared to launch another blast of lightning as Gumillia and Lemy aimed their weapons at each other.

Stalemate Broken
As the conflict dragged on, Gumillia cast acceleration inscription runes and Clockwork Secret Art before speaking with the Demon of Wrath, who then tried to convince her to forge a contract with it. Seeing Lemy lunge at her with his knife, the green-haired mage deflected his blade using the barrel of the gun, causing him to lose balance. Listening to the demon's argument, Gumillia agreed to forge a contract and transformed the Golden Key into a bullet. Loading the bullet into her gun, the mage aimed it at Lemy and shot him. After Lemy's death, his soul was absorbed into the Glass of Conchita. Inside the glass, the former assassin regained his past memories and met with Banica along with Gretel.

After witnessing Lemy's death, Irina's fire magic grew weaker, becoming only a shimmer. With the duel no longer at a stalemate, Elluka wheeled closer to her sister-in-law, who then conversed with her before relinquishing her control over her human body. Now in her cat form, Irina came out from behind from Pale's tomb. Continuing their conversation, Irina activated the magic device in her body, Black Box Type S, as a last resort, her body beginning to emit light. As the Clockwork Lullaby began emanating from the box, Gumillia and her master braced themselves as Irina's cat body exploded.

Mind World Meeting
As a result of the explosion, Gumillia and Irina were transported to Levia's mind world, where they met with the twin gods as well as Eve Moonlit. Irina then explained how "Elluka Clockworker" was actually Levia, who had forgotten her memories; after Irina spoke about her history with Elluka and her intentions as a HER, she whispered into Eve's ear, commanding the "Master of the Court" to awaken.

The illusory Leviantan temple then collapsed, revealing a void-like world called the Court. Conjuring large pillars of fire with her hands, Irina watched as Banica descended from the sky, who revealed her intent to destroy her. The Demon of Gluttony then raised her hand, summoning the "Worldeater", a gigantic skeleton monster. As the monster opened its mouth, Irina and Levia blasted the monster with fire and lightning, respectively.

Aftermath
Sometime after, Gumillia, Behemo and Seth Twiright were transported to the Hellish Yard, with Behemo leaving shortly after to enter the Heavenly Yard. Following the duel, the souls of Levia, Eve and Irina fused together to form a new consciousness; calling herself Ma, the woman then left the cave. Following the end of the duel, Germaine Avadonia regained control of her body, suffering from rapid aging. Sometime after, the World Police recovered the vessels of sin and arrested Germaine and Gatt.

Civilian Perception
The Duel of Merrigod Plateau eventually became regarded as a historic event, with Merrigod Plateau being known as the duel's battleground. Historically, Irina was credited to have been defeated by Elluka, the former being said to have disappeared from history. After the Duel, Gumillia was also said to have mysteriously disappeared by the end of the battle. After the aged Germaine returned to Rolled, the populace continued to perceive her to be "Julia Abelard". Following the incident, the criminal organization Père Noël was also thought to have disbanded.