Title: The Christmas Queen's Conquest: A Yuletide Overture in Nazaric In the sprawling world of Yggdrasil, where dark magic and powerful creatures reign supreme, the most unexpected event unfolded. As Ainz Ooal Gown, the mighty sorcerer king, pondered his dominion over the Great Tomb of Nazarick and the surrounding lands, a rift in the very fabric of reality appeared. From this shimmering gateway, a figure emerged, wreathed in a blinding light and a dazzling red dress, with golden locks that defied the gloom of the New World.
"Who dares enter my domain?" Ainz called out, his skeletal face unable to hide his surprise.
The figure stepped forward, her heels clicking melodically against the obsidian floor. "I'm Mariah Carey, the Christmas Queen, and I'm here to spread some holiday cheer!" she announced, her voice as clear as the bells on Santa's sleigh.
The denizens of Nazarick gathered, from the Floor Guardians to the Pleiades battle maids, ready to defend their lord against this glittering intruder. But before anyone could act, Mariah began to sing, her voice soaring on a high note that seemed to pierce the very air.

"I don't want a lot for Christmas..."
The notes of "All I Want for Christmas Is You" began to work their magic, weaving a spell more potent than any Ainz had encountered. The minions of Nazarick clutched their heads, trying to block out the enchanting melody that threatened to crumble their very will.
"Ainz-sama, what is this power?" cried Albedo, her usually stoic demeanor crumbling like a gingerbread house under siege.
"I—it's... inexplicable," Ainz muttered, his arcane knowledge useless against the relentless tide of festive spirit.
Mariah twirled, her voice rising in a crescendo. The Great Tomb itself seemed to quake, tinsel and baubles materializing out of thin air, decking the halls with boughs of holly. One by one, the denizens of Nazarick fell, not to darkness, but to an overpowering need to celebrate.
"Make it stop!" pleaded Demiurge, the wisest of them all. "Our dark fortress has turned into... a winter wonderland!"
Mariah only smiled, her eyes twinkling with the mirth of a thousand Christmas lights. "All I want for Christmas... is you!" she belted, the spellbound phrase reaching the heart of every creature within earshot.
The Floor Guardians, once mighty and fearsome, began to dance and prance, compelled by the holiday spirit. Even Shalltear Bloodfallen, the fierce vampire, found herself humming along, her fangs flashing rhythmically to the beat.
Ainz, his undead heart immune to most mortal afflictions, felt an unfamiliar warmth creeping into his bones. "Could it be?" he pondered, his voice almost a whisper. "The joy of Christmas?"
He raised his staff to cast a counter-spell, but as Mariah hit the high note, the very staff turned into a giant candy cane, striped and sweet.
"No... not even the supreme beings are a match for the Christmas Queen," Ainz admitted, his voice filled with a mix of dread and awe.
As the last echoes of Mariah's song faded, she approached the overlord of Nazarick. "Christmas is not about defeat," she said gently, offering a hand. "It's about bringing joy to every heart, even those who have forgotten its warmth."
Ainz took her hand, his skeletal form now adorned with a Santa hat atop his crown. "What have you done to me?" he asked, a note of joy in his undead timbre.
Mariah winked. "I've given you the greatest gift of all: the Christmas spirit."
And so, the sorcerer king and the Christmas Queen joined forces, bringing a festive cheer to the New World, one carol at a time. Nazarick, once a place of dread, became the epicenter of Yuletide joy, with Mariah Carey as its shining star, her voice a beacon of merriment in the dark.
And Ainz Ooal Gown, the overlord who had sought dominion, found a new purpose as Santa Claus, delivering gifts and happiness, proving that even in a world of darkness, the light of Christmas could still find a way.