Disclaimer: I don't own Overlord (the anime/manga/light novel) and the rest of the other works that will show up. They are owned by their respective owners.

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'Thoughts'

"Speaking"

"Moves"

*Actions*

-Time/Location-

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-Throne Room of Nazarick-

Ainz decided that he will see what is happening in the villages. To see what is occurring there to see what is happening himself via the use of the Mirror of Remote Viewing, a scrying tool. In the mirror, it displayed a village being attacked by Heartless and Nobodies. Two people stood out to the Overlord as they seemed to not be attacked by the big army.

"Hmmm. It would seem that this possible player has started his first move...albeit a stupid one it seems," Ainz said.

"This fool is just asking for trouble. He's barely a player, almost a pawn," Demiurge said. The rest of the Floor Guardians are watching.

"What even are those things? They don't look like anything from our world," Shalltear said.

"From what I learned those, beings seemed to be named Heartless and Nobodies," Demiurge said.

"Heartless and Nobodies? I do not have a memory of such beings in Yggdrasil. But it doesn't matter. They are a problem that must be dealt with as soon as possible," Ainz said. "Albedo! You will accompany me alongside Shalltear! As for everyone else! Return to your floors and raise security to the max!"

"As you wish, my lord," Demiurge said as he bowed.

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-Meanwhile back at the village-

The Heartless and Nobodies were finishing up with the rest of the humans. As in capturing them to be turned to even more of them. Leading them were the two individuals that caught the attention of Nazarick, Xenmas, and Ansem, Xehanort's Nobody and Heartless respectively. Both of whom are very powerful among their own races.

"These inhabitants seem very weak! Pathetic!" Ansem said as he looked disappointed as none of the villagers were strong enough to do anything.

"I agree with you, Ansem. But we must remember what we have come here to do," Xemnas said without a shred of pity or anger towards the villagers.

"See if there is anyone who could pose a threat," Ansem said.

"Hmmmm?" Xemnas said as he and the Heartless saw the magic spell gate open up with Ainz coming through with Albedo and Shalltear in their own respective armors.

"Like these three," Ansem said.

"Are you two the ones leading this attack?" Ainz said.

"Yes, we are. I am Ansem, the Seeker of Darkness," the Heartless said.

"And I am Xemnas, the Superior," the Nobody said.

"I am Ainz Ooal Goal and I have come to stop you and your army from threatening our home, the Great Tomb of Nazarick," the Overlord said.

"We don't care about your tomb. We are simply trying to turn these weaklings into more Heartless and Nobodies," Ansem said as right on cue a Neoshadow Heartless turned a human into a Shadow by very much devouring his heart right in front of the inhabitants of Nazarick.

'So they can make more of these, it seems,' Ainz thought. 'THIS is really bad! It would seem they are very much a threat!'

'Those three are rather powerful and can pose a problem to our plans for this world. Which is why we must test to see how strong they really are,' Xemnas thought.

They prepared for battle, and then both sides began to fight each other.

BGM: A Fight to the Death ~ Kingdom Hearts HD 2.5 ReMIX Remastered OST

"Albedo, Shalltear, deal with them I shall go and deal with these enemies in the village," Ainz said as he cast his fly spell and flew in the direction of the village.

Shalltear charged at Ansem and tried to stab him with her spirit lance but Ansem's Guardian grabbed it and then punched her directly in the face. This actually bruised her face.

"Tch. Vermilion Nova!" Shalltear said as a pillar of fire then attacked Ansem which seemed to do fire damage and sounded painful. Then Shalltear teleported behind him using the Greater Teleportation and stabbed him in the chest but quickly found out that he was unharmed by that. She was then caught in a dark circle that was summoned behind her eventually transforms into a cage of dark claws that trapped her. Then Ansem exerted red energy around him which pulls in and knocks back the true vampire in the cage before he unleashes tendrils of darkness that dealt heavy damage to her.

Shalltear was pushed back, but due to her skill, Time Reverse, she was able to recover after taking the large hit by Ansem by reversing time and allowing her to be recovered.

"Tch how annoying," Ansem said as he sic his guardian after her.

Albedo was blocking the spinning, flipping, and slashing Ethereal Blades of Xemnas who was teleporting in all directions. She saw that unlike the lower life forms of the Sunlight Scripture, this person actually was putting up more of a fight and even tanked a thrust by 3F and a lot more.

In response, Xemnas fired energy-balls, which then exploded into orb-like, damaging force fields, which caused her to actually get damaged when she was caught in one while also receiving a barrage of attacks from the Superior. This actually left some electrical marks on her armor and slice marks from Xemnas' Etheral blades but she then used her special skill and all of the damage done to her was gone but at the cost of losing a piece of her armor, more specifically her gauntlet.

'How can this happen? This person must either be a Supreme Being or something else entirely,' Albedo thought as she redirected some of the Ethereal Blades back at Xemnas when he created a ring of blue Ethereal Blades that fired at her at his command.

Meanwhile, Ainz was dealing with both the Heartless and Nobodies and ran up to fight him in combat. He tried to kill two Shadows by slamming them into the ground however he quickly found out to his dismay while it did kill the beings he quickly found out they could come back as they respawned in his own eyes.

'How is this even possible?!' Ainz thought but then the emotional suppression made him calm again. He then saw Creepers, Dusks, Shadows, Neoshadows, Gigashadows, and Nobody Sorcerers coming towards him.

"Negative Burst!" Ainz said as all the Heartless near him were destroyed due to him unleashing a burst of a sphere of negative energy from around him. However, he found out that the nobodies seemed to not attack him which seemed to confirm that they must have intelligence and he saw that the heartless he destroyed were already coming back. Except for the Neoshadows who actually avoided it by going into the ground.

Then Ainz started to receive visions of a strange key being dropped into the treasury of Nazarick by what appeared to be a tear in space. He didn't know what it meant, nor what the odd eye-filled tear, in reality, it fell from was.

"Dragon Lightning!" Ainz said as he cast the Lightning spell, and that was able to destroy the Heartless around him. The Dusks and Creepers rushed on over to fight him with the former slithering on the ground in ways similar to a snake and the latter turning into swords to fight Ainz.

He wasn't sure why, but it seems that this key he saw fall in the treasury must've made him able to destroy the Heartless.

"Fire Ball!" Ainz said as he launched a fireball that destroyed the Dusks and Creepers. He then used the same spell again at the Sorcerors however they were able to actually survive the attack, the reason was that they were immune to ALL magic. In response, the Sorcerers began to use their invincible cubes to hit Ainz.

"Create Middle Tier: Jack the Ripper!" Ainz said as he created the undead. "Get them!"

The undead ran toward the Sorcerers which tried to wack at it, but the being dodged them freakishly fast and began to cut them up, and Ainz realized that whenever the Nobodies and Heartless were destroyed the former exploded in a puff of darkness while the latter turned into a nondescript of energy.

Albedo kept blocking the attacks of Xemnas but then she was launched into the air due to Twilight Thorns materializing out of nowhere. He took this opportunity to attack her with slashes and even did a spinning kick with energy enhanced into the kick.

'It would seem that this is an opponent that I can't underestimate,' Albedo thought as she landed a hit with 3F on Xemnas.

"Greater Teleportation!" Shalltear said as she avoided being hit by two Dark Firagas fired by Ansem's Guardian. She teleported at the side of him, and managed to actually inflict damage to him, and even managed to absorb his life energy to heal herself.

'Does this mean there's a Keyblade user nearby?!' Ansem thought and had the Guardian begin to try to punch Shalltear, and managed to successfully land hits. She was hit in several parts of her armor and even damaging her though she was able to heal up from the damage due to her vampire powers.

Ansem then teleported away and then had the Guardian slam into the ground in front of Albedo causing dark spikes to generate causing damage to the succubus. Which flung her back, but landed perfectly at the side of Shalltear.

"Before I ask, what are your names?" Ansem said.

"I'm Albedo and this gothic lolita of a vampire is Shalltear," the Succubus said which made the True Vampire annoyed.

"I see. I will be sure to remember that...IF you survive this," Xemnas said as he then creates a lot of Twilight Thorns that shrouded the area making it dark. Then thousands of lasers materialized and began to launch themselves at Shalltear and Albedo, who began to quickly deflect them.

They were both deflecting the large amounts of lasers being sent toward them which quickly replaced the missing lasers with new ones that launched at the two NPCs. All while Ansem and Xemnas were watching analyzing their combat prowess which was shown to be very good.

Eventually, the arena glowed bright returning to the town that all four were originally at.

BGM End.

Ainz teleported in front of the two Nazarick NPCs. This told Ansem and Xemnas that the Heartless and Nobodies were taken care of.

"Well. You are all really strong, impressive," Ansem said.

"We did what we came here for, we can leave, now," Xemnas said.

Then they left via the use of a Corridor of Darkness for both of them. Normally the use of this would erode the body, but Xemnas was wearing the Black Coat to protect himself from the darkness while Ansem was a being of darkness and was outright immune to it.

The rest of the heartless and nobodies were destroyed, and to all three of their surprise, those who were turned into heartless reverted back to a normal person. Though they all seem to be unconscious.

"That was...interesting," Albedo said as she took off her helmet.

"Well of course. But I actually faced off against a real challenge!" Shalltear said with a grin.

"We must stay alert. They talk about a higher authority. The ones they answer for might be stronger than them," Ainz said.

"You're right Milord. But I do wonder what their other allies are like?" Albedo said with curiosity as the townspeople were still unconscious.

A/n: Remember when Ansem and Xemnas showed up both at once to Sora, Donald, and Goofy in KH3 and that was insane? Well, this it but this time with Ainz, Albedo, and Shalltear and this time the two rivals to become headwife of the Overlord fight them! And it is worth to note that both Ansem and Xemnas have their bodies and are not inhabiting replica bodies from KH3.