I decided to do something different again and used a random picker wheel for the first dark multiverse chapter. And as you can see the winner was Spooky.

BTW, there will be gore in this chapter.

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Everyone sat in the theatre waiting for Metroid99 to return, with Rias looking over Issei after Metroid99 had removed the boost gear from him. WAMred was chatting with Stealth.Z and Will was going through his phone, smiling at some messages from his friends or staff. Soon Metroid99 emerged from the back. Everyone looked to him noticing that there was no orb with him.

Yang: No orb? What you ran out of universes of that weakling already?

Metroid99 just looked at her, causing a shiver to run up her spin. She sat back down trying to keep her gaze off of Metroid99.

Metroid99: Now then, no I have not run out of universes, far from it actually. Just another special guest wanted to join us and show you all something as well

They looked at him confused but before they could ask any questions, a spiral of dark energy pooled overhead. It began to swirl rapidly kicking up some wind, all of Union looked on surprised and shock all the while WAMred and Will looked on interested. The energy began spiraling downward until it touched down in the middle of the theater. Red eyes were seen in the twister of energy until it dispersed revealing Chaotic. Chaotic chuckles to himself as everyone stared at him. All of Union felt a terrifying aura come off him.

Chaotic: Hello, Union

Ozpin: W-Who are you?

Chaotic suddenly disappeared and reappeared in front of Ozpin scaring him.

Chaotic: I am known as Chaotic, a creation of Metroid99. I watch over a similar universe to what Metroid99 watches except for one big difference

Qrow: And that is

Chaotic chuckles to himself creeping out Union greatly.

Chaotic: The (Y/N)s of this multiverse, I guess can say are evil incarnate, evil that you all shaped to be. Your ultimate demise

His voice dropped at the last part creeping them out further, though WAMred and Will looked on unaffected. Chaotic then snapped his fingers causing an orb that was red in color to appear next to him. 

Chaotic: And I have the perfect world to start with

The orb then flew to the screen entering it. It began to glow for a second before revealing the world to everyone.

We see many students of union, consisting of Yang, Weiss, Rias, Issei, Akeno and Xenovia, Bakugou, Mina and Kirishima. They laid on the ground unconscious, inside some building. Shortly after they began to wake up confused and a bit dazed.

Weiss: Where are we?

Mina: I don't know but I'm creeped out

Bakugou: How the hell did we even end up here?!

Yang: I don't care, nor do I want to find out

She turned around and saw a door, walking over to it she tried to open it only to find that it wouldn't budge. She continued to try, only for nothing to happen.

Yang: What the hell? It won't open!

Weiss: What do you it won't open?!

Yang: Exactly as it sounds Ice queen

Rias: Then, we'll just bust it down

Rias held her hand to the door ready to charge her P.O.D but found that nothing happened shocking her and the others.

Rias: M-My magic isn't working

Upon hearing this the others tried to use their powers only to find they wouldn't work either.

Issei: What the hell happened to our powers!?

???: Welcome, to my mansion

They look up seeing a small ghost girl float down from in front of them. She had pale white skin, with long blue hair and wore a blue dress.

Ghost Girl: And just to let you all know, you won't be leaving anytime soon

Bakugou: Who the hell are you!? 

The ghost girl chuckled at this.

Yang: What's so funny you brat!?

She soon stopped laughing, giving the group a creepy grin.

Ghost Girl: You really don't recognize me huh? I guess it makes sense, it was a long time ago after what you all did to me

Akeno: Did to you, what are you talking about?

The girl chuckled more and more.

Ghost Girl: After you all...

Her face shifted and morphed into a terrifying maw.

Ghost Girl: Ǩ̶̖̐̓̋́Ȋ̵̛̫͖̰̻̰͔̘͎͌͜ͅL̸̡͔̱̖̟̅́̐̆̌͋̀͑̒L̴̡̖͆̐̿͂̆͆E̶͍̩͔̳͙̩̝͋͊̔̒͗͆̽̕͜ͅD̸̢͉͖͑́̕ͅ ̷̬͓̏̒M̷̪̀̎͋̊͌̈́́̃̂͝E̷̢͕̻͚͖̅!̸̛̮̩̈̅͐̅̏̈́͋̀͝!̸̰̮̩͙̱̀̀̾͝

They all look at her terrified at what she had become. This gave her much amusement.

Ghost Girl: Ḏ̴̛̣͕̲͇̫͇̦̮̖̈́͑̏̈́͒̿̍Ö̷͎̝̣͇̰̰̫́̈́̄͆̂͝ ̸̼̩̐͂͑́͘Y̸͚̞̰̗͈̭̞͍̥̔̇͜O̷̡͔͍̺͊̿͛͘Ū̵̢͖͈͍̱̲̬̭͗́͆̈́͜ ̴̢̛̻͈́̑̈́Ȓ̸̡͍͖̝̾̃̑͊͒̚̚͝Ȩ̵̛̛̥̹͔̻͎̺̮̤̗̽̃̇̈́̽͛͋̕C̷͉͈͎̼̜͎̮͓̒́̈́̂̓͝Ò̵̙̜̩̖͉̗̫̏̈̓̓̀͘̚͝͝G̵͓͉͚̖͖̀̔̉̆̃̔̊̕͠͝ͅN̶̨͙̼͊̇ͅĬ̵̢̧̳̭͖͔̩̤̘͒͜Z̴̧͉͎̓̚E̶͓̩͈͖̯̜͉̭̮̥̍̍̍ ̵̡̖͇̳̮̣͖̎͆̂̉͛͜͠ͅM̵̧̦̳̙̿͂̄̉̔̉͑̃Ę̴̨͇̮̩͉͚̯̹̆͊̂̋̐̂́ ̶̡̲̜̺̬̫͇̬̲̿͘͝N̸̖͙̻͖͉̙̉͜O̷̯͙͔̙̱̫͗̑̓W̶̢̩̞̲̩̭͊ͅ!̵̖̤̮̱͖̽̍̀̒ͅ?̶̢̛̙̫̺͗̋̋̊́͑͊͐͘͜ ̶̯̉̀̐I̴̢̩̣̗̞͆̉̎̀̓͋̐̋̋͊'̸̧̦̩̹̺͎̐̇̒͊̍͋͋͆̔̋M̶͚̩̝̒̓̇̎̈́̓͌͠͝ ̵͔͍̲͈͓̰̅̃͘(̶̧̪͍͊Y̷̬̼̜̟̭͚̤̏̇̋̏͛͆̄́͒͜͝ͅ/̸̪̞̭͍̮̙̝͝Ņ̶̢̛̮̼͎͉̪̝̄̊͝)̷̭̝͕̪͇̟̫̥̈̀!̷̦͔̱͉̆!̴̛̭̱̿̎͆̃̿̃̌̆̏

All of Union looked on shocked in the theater.

Izuku: Th-That's (Y/N)?

Ruby: W-Wait she's dead in this world

Chaotic: Yes, by those fools' hands as well 

Yang: Wait are you saying that we killed her?

Chaotic: Yes 

Rias: Makes sense, that a weakling like them would die by-

She was cut off by Chaotic stabbing his claw into her stomach. All of Union looked on shocked at seeing Chaotic attacking her.

Chaotic: I suggest you keep your mouth shut around me. I'm not as forgiving as Metroid

He then pulled his claw out from her stomach, blood covering his claw. She slumped over, looking to almost die from blood loss, but was quickly healed by Metroid99. He then turned to Chaotic.

Metroid99: Please reframe from drawing blood in my theatre, I'd rather not have to clean up any blood 

Chaotic: Tch, fine....

Back in the world, we see (Y/N) back to her normal form looking down at nine with an evil grin.

Kirishima: H-How the hell are you even here?

(Y/N): Haven't you ever heard of a vengeful spirit or are you just that dumb?

Rias: Enough! Why are we here and let us go now brat!

(Y/N): Oh Rias, Rias. Heh heh, you're not one in control here. I am, and I'm going to make all your lives a living hell tonight.

They looked at her as she went into a little giggling fit. She soon stopped and looked down at them with a grin.

(Y/N): Though, I guess I'm not as heartless as you all. So, I'll give you all a chance to get out of here with your worthless lives. All you have to do is get through all a thousand rooms of this mansion

Bakugou: A thousand, you really think we're gonna do that!?

(Y/N): It's either that or you starve to death in this room. Pick your poison

The nine looked at each other, before they began walking deeper into the mansion. (Y/N) watched as they did, waiting to see if they would make it through or not. A creepy grin spread across her face along with white blank eyes

(Y/N): F̷̫̼̫̞̏̈́͐͊̓̐̈́̚͝A̷̬͈̳̳̒̒̀̔̾̀T̷̢̜̺̤̆̏̏̍̈́͂̌͌̚͠ ̸̖͚̯͇͕̥̪̱̘͈͂͋̒̀͛͛͑̌̔͠Ċ̸͚̺̇̆̒̈͊̂̂̕H̴̬̹̥̫̞̳̱͈̏́Á̸̢̪̳̿̔̈́͂͋̈́̕N̸̦̩̟͖͎͙̝͕̈́̒̽͒̋̾͐̍͘͝ͅC̵̦̪̆́̽͋̈̏̃̇E̸̛͕͌̍͋̇̓̇̋̕̕

With that we see the nine make their way through multiple empty halls. Each one seeming longer than the last. Everything was quiet, until a cardboard cutout suddenly popped out with a small noise, scaring them slightly. Once the sudden scare subsided, they glared at the cutout.

Mina: What is this, some cheap haunted mansion?

Issei: Yeah, if that bitch thinks this is going to do anything, then she has another thing coming

With that they continued on getting hit by more of the cutouts, which lead to them being more and more pissed. They continued through some more rooms until they stopped in a more open room.

Bakugou: Okay! That's it, I've had enough of this bullshit! Let us out now!!

He didn't get a response however irritating him further. The group then heard a noise over to the left of them. Bakugou immediately heading over to confront who he thought was (Y/N).

Bakugou: Alright, you little fuck! I'm tired of this bullshit! LET. US. OU-

He was cut off when an axe was embedded into his head. He stood there silent for a second with, blood running down his head. The axe was then pulled roughly out of his head taking some of his brain with it. He fell over shortly after.

All of Union looked on in terror, while Chaotic chuckled at the scene.

Blake: Oh my god...

Idia: What the hell

Many of the weaker stomach individuals hurled, that Metroid99 quickly countered by conjuring up Barf bags.

Will: Well, can't really say the kid didn't have it coming...

Back in the world the remaining eight looked on in horror seeing the ash blonde boy being killed in front of them. Soon after the being revealed themself, though they were shrouded in shadows. The only other noticeable part of them was their red glowing eyes.

He slowly began approaching them, dragging his axe behind him. They backed away slowly from.

Issei: W-What the hell are you, get away!

He didn't listen however and continued to slowly approach them. None of them wanting to find out what he'd do to them, they all ran while separating from each other. Unknown to any of them, (Y/N) was watching with a smile.

(Y/N): Let the hunt begin

With Akeno, we see her running through some halls until she found herself in what looked to be a Japanese inspired school. She looked around confused and out of breath.

Akeno: H-How did I end up in a school? What kind of Mansion is this?

She began exploring the school while trying to find out the others. She looked around seeing multiple abandoned and destroyed classrooms. She began wandering more and more until she stopped and looked down nearly in tears.

Akeno: Please, I'm sorry just let me go!

She heard a noise behind and quickly turns around.

Akeno: (Y/N)?!

She expected to see the small ghost girl, but instead she sees another small pale white girl wearing a raggedy grey dress.

Ringu: You look tasty

Akeno backed up in fear

Akeno: W-What?

Ringu: It's time to eat

She then launched at Akeno, slashing at her with her claws. Akeno narrowly dodged the attack and began to run away from the girl. At this she giggled and began chasing after her. Akeno continued to run through the school being followed by the Ringu. She soon makes it out of the school and back into the regular mansion, but unfortunately, she was still being followed. They continued through the multiple rooms, until they made it to a room was just a large winding walkway maze over a and abyss. Akeno looked around in horror before being to run again once she heard Ringu behind her. She ran over the path trying to find a way to the next door to the next room. However, while she was running Ringu managed to slash at her back drawing blood and causing her to scream. Akeno fell over and slowly began to try and crawl away from the girl but was stopped when she grabbed her by her arm.

Akeno: P-Please no don't

Ringu: It's time to eat

Sounds of teeth tearing through flesh was heard, along with a pool of blood beginning to flow from Akeno. Ringu ripped her stomach open and began devouring the devil's organs.

Union all pale at this.

Asia: *in tears* Why is this happening...

Glynda: A world like this can't really exist right?!

Chaotic: Unfortunately for you all, it does. Heh heh heh

Mina ran through more rooms until she ended up in what looked to be a scene lab.

Mina: What the hell, how is this even in here

She continued through the lab area and soon ends up in a room with multiple glass containers. She walked down the room looking at all the containers that she passed. That was until she walked pass a container that was that was broken. 

Mina: W-What, what could have gotten out

She was soon answered when she heard cricket like sound above her. Looking up she sees a hole in the ceiling and of that hole something quickly tries to dive down on her. Quickly diving out of the way, she rolls across the ground for a few seconds before coming to stop on her feet. Looking up she sees a spider like centipede had exited the hole and was looking right back at her.

Mina: What the hell are you!?

It said nothing as more cricking and chirping noises was heard coming from it. It then rushed at Mina, scaring her and quickly making her run the opposite direction. With that the hunt began, as the Centipede spider chase her. With every door she entered the creature broke down. They soon got out of the lab into rooms that all looked to have pools of acid underneath them. After some time, it seemed Mina had lost the creature. She stopped and began breathing heavily sweat falling off her face.

Mina: This place is hell, I'm in hell right now

She then heard the same chirping noises from before. Looking up quickly she was suddenly grabbed by the creature from a hole above, without any time to react. It slowly began pulling her into the hole.

Mina: LET ME GO!! YOU DAMN MONSTER, SOMEONE PLEASE HELP M-

She was cut off once the lower half of her body was fully in the hole. A wet crunching sound was heard shortly after. Mina looked forward in shock, her eyes slowly vibrating. Blood dripped from the hole as well and soon Mina's upper half fell from the hole, her intestines being very visible as well. She laid there slowly bleed out, that was until the creature came out from the hole along with two more of it. They looked down at the pink skin girl before launching at her and devouring the rest of her.

Uraraka: MINA!

All of Class 1-A looked on in horror at seeing one of their classmates being murdered by this creature. All the while Chaotic continued to laugh at this, enjoying the show greatly.

Kirishima ran and soon ended up in a similar but different lab. He looked around a bit seeing multiple test tubes. He continued through the lab and eventually reaches a dead-end with only a vent.

Kirishima: Well, looks like that's the only way through

He entered the vent and crawled through it. He continued on through them for a little while until he heard a sound behind him. Looking behind him the best he could seeing a large pale eel creature chasing him through the vents. Seeing this he picked up his pace, quickly crawling through the vents trying to find a way out. He soon makes it out but unfortunately the eel followed. He ran from the eel until he made it to an electronic door. Pressing the button on the other side of the door, with it slamming down on the eel's neck seemingly killing.

Kirishima: Ha, it's gonna take a lot more than that to kill me you bitch

 He turns and was about to leave but stopped when heard the thing shaking and convulsing. Kirishima looked at it confused and soon something burst from the head of the eel. It looked like some type of creature wrapped in skin.

It stepped out from the eel and slowly began approaching the red hair teen. Him backing up in response.

Kirishima: G-Get the hell away from me!!

With that he ran away from it. He ran through multiple rooms with the creature slowly following. After some more running he suddenly heard a noise behind him. Turning around he sees that the parasite had transformed into a small worm like creature that was gaining on him. He tried to outrun it only to find that it was pointless. The parasite jumped at him and bite him in the neck. He fell over holding where the parasite had bit him, and soon he found it hard to breath. His veins began to pop, and it soon traveled up to his eyes. In his vision he sees around him as everything went red and soon black.

Snipe: What the hell was that thing

Chaotic: That was a parasite, I'm pretty sure you can guess what happened to the red-haired idiot 

Union again was in horror again, as Metroid99, WAMred and the rest just looked on.

Issei eventually ran into a room full of water with boxes strung about as well. We began making his way through the water and some other rooms. He soon makes it to a large open room with multiple boxes floating in the water.

Issei: What the hell is up with this place?! How is something like this in here?!

He continued to walk through the water, until he sees a woman with long white hair sitting on a box facing away from him.

Upon seeing her Issei had a perverted grin plastered over his face.

Issei: Hey, Beautyful. What's someone like you doing here?

He got no response from her.

Issei: Hey you hear me right?

Again, not response sort of irritating the devil.

Issei: Hey! Are you gonna say something!?

He began to approach her, but suddenly she jumped into the water going under shocking him. Soon multiple ruptures of water headed towards him quickly, with him not having any time to react. Once it got to him it grabbed him and pulled him underwater. Plunging him deeper and deeper, with the room of water seemingly being deeper than it looked. Slowly the perverted devil began to drown, while looking at the face of the siren struggling to break free. Then the siren's face changed to a terrifying monster.

That was the last thing he say before he drowned.

Rias looked on in horror, seeing her pawn drown.

Kiba: That thing was a Siren

Chaotic: Aw, it was nice seeing that boy get punished for his perverted actions

Weiss ends up in a snowy forest, looking around she was confused. 

Weiss: How am I outside, wait something doesn't feel right...

She shook her head and began making her way through the forest and soon ran into some deer.

Weiss: Deer? Why are there deer in here?

She began to approach them, but soon found that to be a mistake as the deer showed their true colors. They launched at her trying to bite at her with their sharp teeth. Some of them managed to nip Weiss before she outran them into the next room.

Weiss: What the hell! Those weren't deer

???: Come child

Hearing this Weiss turned and sees a large, cloaked figure that had the skull of a deer.

Weiss looked on in fear, before running away with it following quickly after. Weiss ran through room to room trying to get away from the Deer Lord.

Deer Lord: Why do you run child?

Weiss: GET AWAY FROM ME!!

Unfortunately for her more of the strange deer got in her way and bit her legs drawing blood and forcing her down from the pain. She whimpered a bit and turn to her back seeing the Deer Lord looming over her.

Deer Lord: Your submission is inevitable

His cloak opened up revealing his ribcage along with multiple screaming souls. Tears perked in Weiss's eyes as her soul was then consumed by the Deer Lord.

Ruby: Weiss!

Jaune: This can't be happening

Everyone else looked on unable to even say anything of what they had witness.

Yang ran through multiple halls before slowing down and breathing in heavily. 

Yang: Did I get away?

She looked around seeing that she was basically lost now.

Yang: Damn it I got separated from the others, I hope they're okay. That little brat's gonna pay for this

She began walking through some more rooms in hopes of finding the others. She soon comes upon a room with just a table that had a note on it. Making her way over to it she picked up the note looking over it and read. While she was reading it, she suddenly heard a sound that sounded like choking and gargling. Turning around she sees a strange black and green one arm creature crawled out from the ground.

It pulled itself out of the ground and began floating towards her freaking her out.

Yang: What the hell are you?! Get away from me!!

She began to run as quickly as she could with the creature following after her. As she ran from room to room, she found herself be puddles of green and black goo slowing her down. The creature almost caught her a couple of times, but she managed to avoid it. 

Yang: Try you ugly basta-

A cutout popped out hitting her in the head and knocking her over. Slowly recomposing herself she was then met with the creature grabbing her by her neck, beginning to choke her. She struggled to break free not being able to. Soon the same black and green ooze began spilling out from her mouth. Seconds later she stopped moving, with a pool of the green and black ooze pooling around her head.

Ruby was nearly in tears looking at this.

Qrow: Why is this happening?!

Chaotic just continued to chuckle.

Rias ran until she came to a room that was just a straight long stripe of a platform over an abyss. She looked over the edge in fear, taking a deep breath she began moving forward hoping to find a way out. But she then felt an immense pain in her back causing her scream. Falling to her knees she looks to see what had damaged her and sees an axe embedded in her back. Looking back further she sees the figure from before standing there. Rias looked at him in fear, that was until she heard a laugh. Looking in front she sees (Y/N) floating there giving a creepy grin.

(Y/N): Well, isn't this something to see. The "mighty" Rias Gremory at my mercy

Rias: S-Shut up you damn brat, when everyone else finds out about this you'll pay 

(Y/N): Not like I got much left to lose anyway. Though how about I tell you this before I kill you

She got up close to Rias's face looking her right in the eye. There was then a swishing sound, with Rias having a face of shock. Seconds later her head fell off with a fountain of blood pouring out of her neck. (Y/N) then pushed the body over and down into the abyss underneath. She picked Rias's decapitated head and looked into her eye.

(Y/N): K̵̞̳̗̱̰̜͗̍̏̎̐̕Ą̸̰̪̗͚̪̫̹̤̖̒͋̉̓̆R̵̛̦͉̮͈͂M̵͇͓̣̒̇̃̈́A̵͎͎̺̭̘͇͋͊̄͌'̶̛̫͖͋͌͊̍̒͑̕̚͝ͅS̶̨̢̢͓̮̮̰̀̏̊̋͌͛͗ ̵͉̗̥͚̱̆͌Ạ̶̛͓̮̬͍͊́̈́͆̑͆͛̿͠ ̴͚̣̹̆̀͗̾͋͘B̴̪̗̃̓̍̎͐͑͝Į̸͖̳̮͇̞̓̉̇̉̐͝ͅŢ̶̠̟̝̼̼̿̈́̄̐̀͛̔͠C̵͙͈̺̮̮̖̾̒̾͊̌͘̚̕͝Ȟ̴̪̭͕͙͝ͅ ̵̣̭̝̳̌̊̒͛̇̀͊͆̆Ą̵͓̰̖̲̳̜̒̎̋̇̄̓̋̈͠'̷̨̢͖̠̮̲̘̝͛̐̅́͜͝Í̶̛̩͓̝̰̙̟̼̠̠̇́̐͊͌̾̂ͅG̴̨͇̹̞͈̻̲̟̟̓͜Ḩ̴̛̥̥̹͎̱͍̥̳̐̽͋̈̾͜T̷̘̺̮̈́͛͆͘ͅ ̵̮̲͉̩̙͂̽Į̶̫͉̬̠͚̲͙̑̆͐̒̄͜T̵̨̪̜̲͇̰̪͐̅̋̈́̀͛͒͑̔͘ͅͅ?̷̨̛̛̑̿̂̅̏̕͘͠

She chuckled to herself before throwing the head over too.

(Y/N): Let Union come, I'll put them in their places too

With that the screen glowed and the orb flew out to Chaotic. Sirzechs stood up furious glaring at Chaotic.

Sirzechs: This is blasphemy, there's no way that little brat could have killed my sister. That little brat is no-

He was cut off when Chaotic disappeared and then suddenly reappear in front of him with the tip of his claw placed on the devil king's forehead, seemingly paralyzing him.

Chaotic: I suggest you watch your next words "devil King", because if the next words out of your mouth is something I don't like....I will personally remove your tonsils with my bare claws

Metroid99: Chaotic...

He looked back to his creator.

Metroid99: Calm yourself, he's not worth it right now....

Chaotic simply scoffed at this and teleported back to Metroid99's side. With that him and Chaotic left to the back.

Metroid99: We'll be back with the next world of the regular multiverse, until then stew on what you just saw...

With that they left, leaving Union to their own thoughts.