Nazarick x Christmas

Nazarick x Christmas (ナザリック×クリスマス) was a holiday event hosted by the denizens of the Great Tomb of Nazarick for their master Momonga. It lasted from December 18, 2019 to December 28, 2019. The event was re-released on December 15, 2020 to December 28, 2020.

Background
Momonga began look for opportunities to go through diplomatic channels. Albedo witnesses him practicing his greetings, wearing a "Mask of Envy" to hide his appearance as a skeleton. Then she asked――what exactly is "Christmas"?

Christmas Planning
Momonga who was shifting through his Item Box found his Mask of Envy. Speaking out loud, he reminisced how he received this event item during Christmas in YGGDRASIL. Wearing the mask he found he could hide his skeletal features and began practicing acting his role as ruler of Nazarick. Albedo had barged into his room, thinking he was in trouble thought the mask wearing Momonga was an intruder until the player revealed it was him. Albedo had heard her master mentioned the word "Christmas." Momonga not wishing to disappoint her on the holiday told her Christmas was a day of celebration for the coming of winter. Winter is the season when most creatures get around, that is, the season when darkness and death become more sensible. A Christmas party is held for close friends and family. Albedo was taken by the holiday, vaguely remembered her memories of the Supreme Beings hosting a Christmas party wished to hold one in Nazarick. Momonga was intrigued by the idea and at the insistence of the Overseer Guardian, permitted her to organize the festivities.

Later Albedo gathered the Floor Guardians to explain her plan. Doing her own research she discovered to have a Supreme Christmas Party, three items were needed: a meat dish, a Christmas Tree, and a Christmas cake. The NPCs were given ten days to acquire the necessary items. Albedo also requested the aid of Pandora's Actor for Christmas decorations for the party. The Area Guardian, after his previous actions in retrieving swimsuits for the Pleiades had already been working on organizing the costume items of the Treasury, had accepted the task. Remembering an item in the inventory, he shows her the Christmas Costume which amazes her as it has the word "Christmas" in it. While he himself is unfamiliar the word, as his master refrained on telling its importance he surmises that it is a dress only to be used on the holiday. Taken by the dress Albedo wishes to wear it to impress Momonga and hopefully finally win the title of Princess. Pandora's Actor agrees and the two work together to prepare the proper decorations and dress for Momonga.

Christmas Tree
The tree was handled by Demiurge who outside of Nazarick was cultivating a patch of treants using seeds from the Supreme Odor Flower that the Floor Guardians harvested for the Supreme Hanami. From the seeds, the demon used them in an experiment and created different strains of treants. The idea was to create an army for Nazarick however he required only one treant for the festivity.

He selected one of his treants for the event, though Aura Bella Fiora and Mare Bello Fiore noted it to be small for its kind. The demon proceeded to release a human captive into the glen. The human thief thinking he was freed attempted to escape only to have the treant drain him of his vitals. After the monster drained the human it fed on several human bodies it quickly grew into an evergreen conifer treant. Satisfied, Demuirge brought his comrade Cocytus to cut it down so that it would be used as a Christmas Tree decoration for Nazarick's Christmas party.

Cake Baking
The Head Chef provided his expertise with the some of the Pleiades assisting. There was a setback when Solution Epsilon used her own fluids for the acidic ingredients of the cake, instead of lemon juice, but they managed to stay on track. They ran out of chocolate along the way as Lupusregina Beta had eaten most of it causing Yuri to be annoyed and chase her. Their commotion is heard all the way to the 6th Floor, where Entoma Vasilissa Zeta, CZ2I28 Delta and Cocytus are patrolling. Despite the other two maids wanting to help make cakes they understandood that patrolling the dungeon is equally important.

For the upcoming party, Yuri and her team had prepared at least ten cakes, using ingredients like cream, chocolate, and sponge cake from the stocks in Nazarick. The first cakes produced by the maids however were originally for decoration. Sebas Tian came to provide his viewpoint that even though he did not have a Cook class and he could help the women in harmonizing the display and taste to enhance their desserts.

Meat Dish
The protagonist, Slimeko and Narberal Gamma were assigned to locate suitable meat worthy of Momonga. Nothing in Nazarick fitted the bill, so the trio went to E-Rantel. Knowing that the human meat market was inferior to whatever Nazarick could produce, the trio instead went to the Adventurer's Guild hoping the adventurers' there would have information on exotic meats. Two adventurers did have some information, pointing out venison to be a superior meat, especially Peryton. Additionally what caught the interest of the three was the rumor of a white Peryton.

Returning to the Great Tomb of Nazarick, they reported to Albedo of their findings, who was thrilled at the discovery. She authorized them to capture the beast, alive preferably so as it could be butchered at the dungeon. To assist them, Shalltear Bloodfallen was sent as well due to her unique abilities. The four then headed to the hunting grounds of where the Perytons visited, which was the Great Forest of Tob. There they encountered Hamsuke who happily greeted them. Learning of their mission, Hamsuke informed them that she had seen creatures matching the descriptions of Perytons. Leading them to a clearing they found nothing until a shadow high above the sky blocked out the sun. Narberal thinking it was a Peryton flew into the sky to investigate, but it turned out to be a Vulture. The bird attempted to attacked Narberal, but the combat maid swiftly dealt with it. After the bird crashed into the ground, other vultures were found, and even the corpse of a deer. Seeing a vulture attempt to fly with the deer's corpse, the group believed that Hamsuke had mistaken the action for a Peryton. The protagonist suggested they look toward the mountains to hunt their quarry, though it was agreed that they would hunt again the next morning.

The next morning the group hike the mountains finding sparse vegetation and rocky terrain. They manage to spot an injured Peryton, however, when they attempt to approach it they were attacked by vultures. Killing the vultures had allowed the Peryton to escape, and it was deduced that the scavengers had a symbiotic relationship with the Perytons. However, the group tracked the injured animal to a cave where to their surprise several Perytons and the rumored Pure White Peryton were.

Shalltear prepares to use [Paralyze] to subdue the Pure White Peryton, and enters the cave using [Perfect Unknowable]. A problem occurs as the Pure White Peryton is surrounded by normal Perytons and thus she is unable to get any closer. Undeterred Shalltear attempts to use [Paralyze] but causes the Perytons surrounding the leader to panic and fly out of the cave in a rush. Narberal uses [Electrosphere] to attack the Perytons to prevent them from escaping. The Pure White Peryton appears from the hole with Shalltear in pursuit, she orders Narberal to target the small fry while she deals with the leader. After many of its subordinate Peryton fell before Narberal, the Pure White Peryton was aided by a flock of vultures but Narberal simply uses [Electrosphere] to eliminate them. Without its allies Shalltear uses [Paralyze] and the beast is quickly captured. Later it was taken back to Nazarick, where it was properly drained and butchered for the Christmas feast.

Aftermath
A gorgeous and cheerful Christmas party goes on without any interruptions, hosted in the Amphitheater of the 6th Floor. Momonga looking at the decorated Christmas tree, beautifully decorated Christmas cakes, and party dishes cannot help but be impressed by the work of his subordinates. He thanks Albedo for her efforts in organizing the event, who has dressed in a Christmas Costume for Momonga. Though he is briefly embarrassed he recovers and tries to delicately handle this. His acceptance of the outfit causes Albedo to bring up the final decision of the Princess War. She tries to promote herself as being the most worthy as his bride, though Momonga reminds her this event is a time for family not personal agendas. That being said, seeing his Floor Guardians enjoy themselves, Momonga decides to add to the festive atmosphere and uses his magic [World Change] to create snow much to the delight of the party guests.