Nightmare pushes Dream back with great force. He slightly growls when the other manages to stay on his feet as he skids back. He is about to attack once more when something else catches his eye. He spots Black, Swapfell Sans, stabbing Killer in the chest with a sharp bone. He supposes that he shouldn't be surprised of Killer being struck.

This is after all war between two groups, who abandoned their home worlds to fight, which has been going for a long while now.

However there is something about watching Killer fall to the ground that Nightmare hates.

Nightmare narrows his eyes with a growl. "Fall back! To me!" He calls hurrying towards a portal he opened. He grabs Killer along the way with the others from his group hurrying through the portal with him. He closes it behind them once everyone is through. He finally can check Killers wound. He frowns as it looks pretty deep.

Dust, Dusttale Sans, moves closer to take a look. "Looks pretty bad." He mentions. "Luckily I know someone." He takes out his phone calling the other who he talks to arraigning the meetup.

Cross, X-Tale Sans, helps to take Killer to a place where he can lay down; which turns out to be Killers room.

Though it wasn't long before the Alphys with some scars came. She is standing next to the bed assessing the wounds as Nightmare hovers close by. She lets him for a bit before finally sighing. "You need to leave." She tells Nightmare.

"Fuck that." Nightmare hisses in return.

"Come on you." Cross takes ahold of the back of Nightmares clothes dragging him out of the room.

Nightmare did struggle, but a part of him seemed to understand that Alphys needs to work.

Cross manages to get him out of the room. He uses his magic to close the door. "There. There." He adds in an assuring yet teasing way as he is being glared at.

Nightmare ends up pacing as they wait though no one stops him.

All of them are a bit anxious about if Killer will pull through after all.

Nightmare clenches his teeth as images of Killer turning to dust appear in his mind. His pacing gets more and more aggressive. His mind playing out scene after scene of ways he could lose Killer. 'I must do something.' He thinks to himself. 'I can't do this without Killer. I need him! But...' He almost flinches when he realizes that he is immortal while Killer isn't. His pacing slowing to a pause. 'I can't let that happen. I just can't. I'll be lost without Killer. Killer...' His mind plays the first time he met the other.

The world was full of dust. So many places with dust and in some places some bone attacks. It was as if someone had gone on a genocide route.

Nightmare continued on his way through the world alone. He didn't have anyone to go through the worlds with him. He couldn't help but wonder just who had done all of this. He only saw destruction and death in this world. He moved towards a cliff area as he hoped for a better view. He paused however as he came across the sight of another.

Another skeleton had been sitting up there staring off into the distance. He didn't seem to notice Nightmare at first.

Nightmare figured that it must be a Sans based on how he looked plus how he dressed. He took a few more steps closer which got the others attention.

The other turned around quickly to look at who had approached him. His eyelights are gone leaving his eyes black and empty. "Who are you?" He questioned softly tilting his head as he examined Nightmare.

"I'm Nightmare." Nightmare introduced himself. "Who are you? Are you responsible for all of this death?"

"So what if I am?" The other demanded. "You going to fight me?"

"No." Nightmare had an idea. He could use this talent. "I want you to join me. I will destroy the worlds I choose. Will you come with me?"

The other took a moment to think. He finally got up and moved a step closer. "Sure. This place is boring now." He agreed to join Nightmare. "Call me Killer."

Back in the present Nightmare glances to the door to the room that Killer is in. He grew to like Killer as time went on. He found the other to be everything he ever wanted in a mate. He however is now reminded that Killer is only mortal. He could very well lose the one who started the whole group. He turns away at that very thought. He doesn't want to think of Killer dusting again. He turns back when the door opens. He hadn't paid enough attention to the time.

Before any word could come out of the others mouth Nightmare pushes past.

Nightmare rushes into the room going straight to Killers side. He kneels by the bedside looking at the other.

Killer has been stripped of clothing over his top half. He also has bandages wrapped around him. He seems to be possibly asleep.

Nightmare slightly turns catching the conversation behind him.

"He'll live. With enough bedrest."

"That's good to hear." Cross responds to this. "He gave us a good scare there."

"Yes well if he tries jumping around or anything then things could change. Just keep him relaxed if possible."

"We'll report that to our boss. He'll be able to help. Thanks." Dust adds then the Alphys leaves.

Nightmare turns back to Killer. He feels a part of him has relief that Killer is going to live. He just doesn't believe he can take this chance again. He doesn't want to lose Killer. He reaches out wanting to do something to ensure that he'll stay. He stops in a pause however. He can't do this to Killer.

Not without Killers consent.

Nightmare pulls his hand away almost wanting to sigh. He'll just have to wait for the other to wake up. He grabs a chair and stays sitting next to Killer. He turns when Blood, Horrortale Sans, pokes his head in after some time. "What is it?"

"Well I was sent with something to eat." Blood offers the plate of food.

Nightmare nods to the nightstand so Blood places it there.

"Dust made it. He's a really good cook." Blood tries to make sure that the other will eat.

The best cook out of all of them. Everyone in the group knew that.

Nightmare sometimes wonders if that was, a part of, the reason why Blood loves Dust so much. "That's not the only reason you came." He states out loud. He watches Blood glance away as if having been caught.

"Okay. It isn't." Blood admits with a slight sigh. "I was wondering what the plan is. Are we still going to do what we've been doing?"

Nightmare nods. "Of course! I'm planning another attack already." He lies though it's mainly to say that he will make sure revenge is taken. "I will let you all know when it is ready."

Blood nods and heads off after that.

Nightmare turns back to Killer. "Don't worry. I'll make sure that they pay for this." He begins thinking of an attack plan. He has to make sure that they will succeed. He blinks as an idea comes to him. "And I know just how to hit them hard." He plans for a bit longer before asking everyone to go to the meeting room. He stands up front as usual. He can't easily ignore that Killer isn't here. "We will need to attack again." He begins as everyone there is paying close attention. "And one world is perfect. A world that is like Swapfell." He smirks evilly. "We are going to destroy it and leave it for those good guys to find it." He would have gone after Blacks home world if he could... But Blacks soul protects that world just like the others do with theirs.

"Sweet." Dust smiles at hearing this. "I think that's a wonderful idea."

"We move out now. While the other group is licking their wounds." Nightmare orders them.

So they head off through a portal Nightmare creates. They find themselves in the ruins.

"Destroy them all." Nightmare gives the signal and the rest dash off to begin the slaughter. He follows along also killing any he comes across like the others.

They make it to a small house in the ruins. They head inside as there's no where else to go.

A darker looking Asgore steps out from the kitchen to the entrance area. He has on a dark purple robe that almost looks like a cloak with sleeves. He has a gold print on it to show the symbol for monster kind. He has bare feet with tattered bottom of the robe. He has the hood pulled up though his large horns stick out of the hood.

Nightmare snaps his fingers at Error only to point to this worlds Asgore.

Error dashes forward and goes to hit Asgore.

Asgore brings up his arms, to either attack or say something, allowing Error to grab them easily in his strings. He is suddenly lifted into the air. He cries out as Error tightens the strings until he bleeds. He shut his eyes tightly only to open one to see a glitchy Gaster blaster aimed at him.

"S-S-S-See ya." Error slightly waves then fires the blaster getting Asgore to dust. He lets his strings fade away after that.

Nightmare follows the path that seems to lead out of here. He leads everyone though the tunnel until they reach the door.

It opens easily and they step out into the snowy forest.

They continue walking along through the snow. They have left the door open not really caring. They all get a sensation that they're not alone in this part of these woods.

Nightmare flicks a signal for them to fan out and watch for danger.

They make it to the gate before their follower seems ready to show himself. They turn to find a slightly confused skeleton.

He looks like Slim yet is a little different. He has kinder orange eyes, his jacket looks the same though it is orange instead of black, his hood still has the fluff on it, his shirt is black without a turtle neck, he has skinny jeans, and some gold metal on his wrists with broken chains attached; looking like cuffs. He has two gold teeth instead of one; right one on the top and left one on the bottom, one on each side where his canine teeth are. "Who are all of you? I've never seen any of you around." The different Slim questions. He looks a little tense and cautious.

The others of the group are ready to move at Nightmares command.

Nightmare however puts an arm out to stop them. "I will handle this." He informs them making them back down. He lowers his arm then approaches the other who becomes wary. He pauses once a little away. "Oh how good it'll be to do this." He chuckles to himself then his tentacles shoot out quickly grabbing the other Slim. He has his ankles pressed together by one, both wrists grabbed by one each, and one around his neck. He forces the other Slim to the ground getting on top of him to help pin him. He smirks tightening the tentacle around his neck to cause a choking feeling. He refuses to let go even as the other tries to struggle. He glances up as a bone thrown from Dust destroys a Gaster blaster that was meant to hit him. He then notices a portal starting to open. He looks back to the others. "Go." He orders. "Kill as many as you can get your hands on." He turns away as the others dash off after that. He smirks as Dreams group rush into the world through the portal a few moments later.

Blacks eyes widen upon seeing someone who looks like his Papyrus being attacked.

Nightmare, now that he has their attention since they ended up coming early, snaps the other Slims neck bone then swipes at the area where the soul is. He hits it making it visible.

The combined damage causes the other Slim to turn to dust below him.

With a cry of rage Black charges tackling Nightmare trying to pin him. He also summons pointed bones trying to kill the one who had just killed in front of him. He swings them at Nightmare who manages to jump back. He swings two pointed bones in his hands while Nightmare dodges, he isn't letting up and it's clear that he won't.

Dream is about to stop this when he notices that none of Nightmares group are around here. He turns to the others. "Go find the others. They have to be here somewhere. Probably causing havoc. I'll help Black."

At the confirmation that their leader will help Black the others take off to find the rest.

Dream turns his attention to the fight between Black and Nightmare.

Nightmare grabs Blacks wrist in a tentacle tightly. He tosses him off and away causing him to hit his back against a tree hard. He gets to his feet as Dream rushes over to Black who fell into the snow below the tree. He prepares to attack Dream. He sends his tentacles at him grabbing him and yanking him back.

Dream yelps at the suddenness of it. He is slammed against the ground knocking the breath out of him.

Nightmare chuckles then holds Dream down as he charges for Black. His eye narrowed with rage for what Black did to Killer.

Black attempts to get up only for Nightmare to jump onto him pinning him. He tries to struggle to get free though finds he can't get free. Even his legs aren't in a good position to try to get Nightmare off.

Nightmare uses a free tentacle to hold Blacks arms down. "You'll regret what you did to Killer." He growls lowly against the side of Blacks skull. He raises up and starts slamming his fists against Blacks skull. His fury making sure every hit is hard.

Dream tries to squirm free as he is forced to watch this. "Nightmare stop!" He tries to plead with his brother, who doesn't even show any acknowledgement. He desperately tries to get free again. His wrists and ankles hurting from the tight grip. He knows he'll have bruises later. He just needs to get free to help Black. He summons his star rod then tries to use a shield, to force Nightmare to let go. Though he finds the shield stops then disappears when it hits a tentacle. He is starting to feel more helpless as he realizes that he is probably stuck. He looks back to Nightmare and Black.

Black looks hardly conscious as he continues to take hit after hit. His skull has blood on it from where the attack manages to cut his skull a little, and plenty of bruises. He falls limp under Nightmare who just continues to hit him.

Dream shuts his eyes tightly with tears forming. He feels his soul ache at the thought that he'll lose a team member. He can't do anything about it. He lets out a scream hoping that someone will hear him. He closes his mouth to listen if anyone is coming... Only to hear the sound he had been dreading...

Black turns to dust as the beating becomes too much for him.

Dream dares to open one eye to look to where the two were.

Nightmare has paused as though Black turning to dust brought him back. He stares at the dust for a few good moments then turns to Dream.

As Dream stares wide eyed back at him.

During all of this Dust chuckles as he kills another monster. He finds true enjoyment in watching them fall. He turns hearing footsteps. He partially expects one of the others chasing a monster. He however sees some of Dreams group heading their way. "They're here!" He calls to the others who pause to turn to see. He charges and slams into Classic, Undertale Sans, almost managing to knock him over.

Cross rushes forward next and begins a fight with Blue, Underswap Sans, by swinging his red knife at him; only for Blue to use bones to try to block it.

Error leaps at Ink who jumps back then swipes at the strings Error tries.

Blood, Horrortale Sans, jumps at the remaining member Red, Underfell Sans, and tries to pin him down. He finds Red resist then try to swipe a pointed bone at him. He manages to dodge it then attempts to hit him with his cleaver. He misses and the fight continues.

Dust summons a Gaster blaster firing it only for Classic to do the same.

The two beams hit then force the blasters to vanish. A small explosion forming some smoke where the beams hit.

Dust supposes that Classic is stronger than he thought. He pushes that thought away as all that matters is that he tries to win. He summons sharp bones sending them at Classic in waves.

Classic teleports here then there managing to dodge them.

Even as Dust tries to follow his movements. He attempts to map out where Classic is moving to. So he can try to guess where he will appear. He spots a possible stop that Classic might go to next. He moves the attack that way, and manages to knock Classic back when he appears.

Classic shifts to get up and is glad he was lucky in only getting scratches. He can feel weakness knowing that what little Hp he has took a big hit. He manages to wobble to his feet and sees Dust summon a bone in his hand. He knows that the other is going to try to kill him. He summons a Gaster blaster firing it to try to make him back off. He is relieved that it worked and he gets a moment to see how the others are doing. He makes it a quick look not wanting to be vulnerable for long.

Red is managing to block Bloods attacks with his bones in his hands. He jumps back just in time to avoid some bones that shoot from under him. He spins a little as he swings at Blood barely missing a hit. He tries to get more hits while blocking Bloods attacks.

Ink leaps at Error knocking him down only to be pulled back by the strings. He yanks on them managing to snap them, clearly knowing he can't let the strings mean he got defeated. He swings the solid end of his paintbrush at Error; who is made to jump back in order to dodge.

Blue sends a wave of bones in Cross's direction causing him to slightly retreat. He tries to surprise Cross with an attack only for said other to slice the bones. He throws some spinning bones that Cross dodges. He leaps back barely in time after Cross charged. He seems to have only an inch to spare from where the tip of Cross's blade swings. He sends more bones to Cross to try to make sure he won't charge right away.

Classic turns his attention back to Dust and sees that he sent an attack at the blaster. He finds his blaster hit and disappears for now. He is about to summon a bone attack to try to defend himself.

Suddenly there is a distant scream causing everyone to pause then turn.

Those from Dreams group are the first to realize that it came from where Dream is. With Ink in the lead they start running that way fearing their team members are in danger.

Classic managing to keep up though is at the rear of the group. He blinks grateful at Blue when the other moves to help him along.

Those from Nightmares group chase after them not far behind.

They all arrive at the location and skid to a stop.

Nightmare gets up from where the dust of Black lays. He turns from Dream to see that the others have arrived. He supposes Dream must have called them back. "It'll be a better punishment for them to deal with the death." He tells his followers. He opens a portal releasing Dream. He heads through quickly followed by his followers. He closes the portal behind them.

Dream gets up as the others head over to him. "He killed Black." He tells them with deep sadness in his voice. "I couldn't stop him."

Classic and Blue look to each other wide eyed, Red hurries to Blacks dust in horror that his mate is dead, and Ink moves to comfort Dream who begins crying.

Ink knows that Nightmare was right.

This is a better punishment. Having to deal with the death of their teammate. Instead of dying as an easy way out.

For now Ink tries to focus on comforting Dream. He knows that the helplessness on being unable to stop something hurts deeply. He pushes away the thoughts of Blizzard cat who he couldn't save. He needs to focus his attention on Dream right now. He can also hear the cries of Red as he mourns his mate.

Nightmare in the meantime heads to go check on Killer. He gets to the room and walks inside. He swears that the other is looking better already. He sits next to him. "We did it. We got revenge." He informs the other. "They'll be reeling from this for awhile." He places one of his hands on the others hand. "Please wake up soon."

Four days later...

Ink has taken the leader role as Dream takes a break. He can tell how badly the other is affected by not being able to save Black. He also is a bit easier on Red who lost the love of his life. He just hopes that the two will be okay.

They'll all do miss Black, though Red and Dream are just taking it the worst.

Classic has managed to heal in a good amount of time. He is already back on missions to keep an eye on the worlds; to look for any activity from the other group.

Ink sits next to Dream on the couch and pulls his friend close. "How are you feeling?"

"I do feel bad for worlds that get attacked in the midst of this war. I just feel like this hit so much harder because he was my friend. My teammate." Dream sighs heavily letting his eyes close. "I wish he didn't have to die."

Ink gently rubs Dreams shoulder. "I know. We all wish he didn't have to." He mentions as he stays close to the other. "It'll be a hard thing to overcome. Though we should continue fighting. To make sure his death was not in vain." He sees Dream nod his head softly. He stays with the other doing his best to comfort him.

Nightmare has hardly left Killers side. He has his meals brought there for him. He mainly leaves to give the others a good list of work, so they don't bother him too much. He mostly has them spying on worlds for potential new victims. He gazes at Killer only to blink as he swears he sees movement.

Killers head slightly moves then his eyes slowly blink open.

Nightmare stands from his chair and slightly leans over the other. He notices said other look to him. "You're finally awake." He mentions in greeting.

"Sorry if I scared you." Killers voice is rough, scratchy and forced as if trying to push it out.

Nightmare gently places a finger over Killers teeth. "Shh. You don't need to speak. It's okay." He assures the other then moves his hand to his mates cheek. "Killer. I want you to nod your head if you want this, or shake your head no." He sees the other blink in curiosity at what it is. "I can't imagine doing this without you. Seeing you almost die has made me realize that I really can't just do this. Not without you at my side. I want to ask you if it is okay for me to turn you immortal. So you can never leave my side. I won't force it on you if you say no. This cannot be reversed ever. You'll be immortal for all of eternity. I can only make one other immortal. By sharing some of my immortality. And I want to use it on you. If that is okay with you. Just that way we're both immortal." He could make more than one immortal, though he'd end up having to sacrifice his own immortality for that. So he wanted to make sure he could make it count.

Killer smiles to his mate and nods his head. He really doesn't want to be able to be at Nightmares side for all of eternity.

Nightmare smiles grateful and he hovers both of his hands over Killers body. He closes his eye concentrating. A glow comes from his hands and ribbons of purple light start to wrap themselves around Killer.

Killer closes his eyes finding comfort and relaxing warmth in the ribbons. He gasps as a shockwave, of what feels like electricity, shoots through him. He opens his eyes as the feeling fades seeing the ribbons fade. He finds that the spell has also cured his injury. He shifts to sit up as Nightmare lowers his hands then opens his eyes. He smiles to his mate who smiles back to him.

Nightmare shifts away letting Killer attempt to get up. He smiles wider seeing his mate on his feet, as strong as though he was never injured by the attack. "Welcome back my queen." He uses a tentacle to place his old crown on Killers head who chuckles softly.

Neither of them noticing the others watching from the entry way, with approving looks at the two.

It's been quite sometime since Killer became immortal. And the war has been back in full swing for awhile now.

Dream's group has been trying to push forward to continue to fight against Nightmares group, never forgetting the team member that they had lost.

Nightmare arrives to the world he sent his followers to attack. He had just finished making a distraction for Dreams group in another world. He walks towards Snowdin. Knowing that Killer was going to take that small town, while the others took other areas.

They have to try to destroy this world before Dreams group realizes they've been tricked.

Nightmare arrives and glances around seeing all the death that's there. Knowing very well that this is all Killers handy work.

Killer finishes off that worlds Grillby who had tried to flee. He then turns as if sensing Nightmare nearby. He only wears the crown Nightmare gave him, the day he turned immortal, when it won't get possibly damaged. He loves it too much after all. He smiles to his mate in greeting. "You're late." He mentions as Nightmare had planned to arrive earlier.

Though Nightmare took a little more time than planned, to make sure the distraction worked. He grins at his mate. "Sorry. Guess I missed all the fun." He apologizes and the two share a soft chuckle. He gets a nod that Snowdin is empty, so he nods that they should go. He takes the lead as he and Killer head to go check on how the others are going.

Their hands, Nightmares left and Killers right, coming together to hold onto the others hand as they walk.

The end.

AN:

This was written on my phone. So hopefully I caught any autocorrects.

I did this as just a small idea so I kept it to one chapter instead of multiple. I had stopped working on this for awhile then I decided to get back to working on it.

I hope that you have enjoyed!

Kitkat.