A/N:
(Before we start, Dream in this version of my AU will die after eating the black apple, Shattered doesn't exist. It's just a voice in Dream's head but it's not real.)

OKAY THIS IS IMPORTANT
THIS CHAPTER WILL BE KINDA GORY FOR SOME PEOPLE (I didn't go my full, but still made Dream a bit psychotic lol)
If you're not okay with that, It's completely normal, please leave for your own mental health.
(Because the first thing I publish after a long absence is gory and angsty BS, that's normal)

Nightmare noticed that since some time he was being feed by a lot of negativity in the night. Well, of course he was just enjoying it. But after some time it was just becoming weird. Someone was suffering whole night. Like they were hiding true emotions and were letting them out when no one will notice.

The king of negativity wasn't accepting it, but he was worried for his brother. Such pain would really hurt him, so Nightmare decided to check it. He looked where it was, Dreams castle? After some time he realized it could be just Ink getting his vials ready. But then something hit him.

He knew that Ink was checking his vials once a month. But that wasn't what Nightmare realized, everytime he was fighting with the star sanses... It was odd, Blueberry and Ink seemed... Afraid of something, what if Dream took his words personally? What if he was slowly corrupting?!

He opened a portal and begged that it wasn't too late. First time he felt that aura was a week ago. Nightmare knew it was very late to try and save him. It was surely not possible to help him now, yet poor skeleton still wanted to try.

It was one of the first times he regretted something. Nightmare had flashbacks of everytime Dream agreed to his brutal and not true words. It was his fault, and he wanted to fix his mistake.

Nightmare was inside of his brothers castle, everyone except for Dream was sleeping. When he got closer to negativity source, which was his brothers room Nightmare heard a deep voice repeating his brutal words followed by Dream's sobbing.

Nightmare entered surely angry. Dream quickly got up, deep voice disappeared and some kind of shadow escaped by the opened window.

Smaller skeleton smiled as cute as always and his aura was all happy again. It was scaring The King of Negativity even more, because he saw that immediate change and how it was possible.

For how long was Dream pretending everything is okay? Why didn't he look for help? Was it his fault? Was he so blind he didn't noticed?

-What do you need here brother? I hope that I wasn't doing anything wrong, if so then please tell me and I'll just fix it myself don't worry! - Dream smiled like nothing was wrong.

-I know that something's up, just explain and make this easier. - Nightmare was angry, mostly at himself for letting Dream suffer something like that.

-I really don't know what your talking about brother! - Dream was panicking, he was terrified that Nightmare will find out.

-JUST TELL ME THE TR- -Dream looked at Nightmare in anger which was new to the negative sibling what nade him just stand there in shock.

-Leave me alone Nightmare. - Dream hissed with hatred in his voice. Nightmare was just shocked, it was too much for him. Firstly he realizes that Dream has a negative aura every night, then someone is talking with Dream, and when he comes in the only person there is his brother.

Later on Dream calls him by his name and not "brother" and of course he never really saw Dream so furious.  He just teleported away.

Dream layed on his bed, he was tired, it was pretty late so he feel asleep.

Nightmare quickly got up, made breakfast for his team and came back to Dream. He sat down on his bed looking at sleeping skeleton, his brother was so... Peaceful in his sleep, just like in the old days..

-What are you hiding from us Dream? - Night smiled while stroking his brothers head.

-What have you gotten through without me knowing? - Nightmare got closer and closer to him.

-W-What are you doing..? - Still tired Dream asked just wanting to sleep again.

-Hugging you, is that bad? - Nightmare asked, as Dream quietly answered "no".

-Go back to sleep, you are do obviously tired, and I want to talk with you later. - Nightmare said looking at his again asleep brother.

-You're such a dumbass - Nightmare said being afraid of what could happen to his brother. He was angry by how he allowed himself to be so close, but if Dream felt like they were on good terms then he would say more right?

~good old time skip~

Dream finally woke up because of his bad dreams, Nightmare was asleep on the other side of their bed which was great.

Dream quickly got up and ran to the bathroom, he closed the doors and smaller window that he quickly covered with blinds. He just sat down on the floor trying to process his nightmare. He knew why his brother came to him. Should he even call that THING his brother? Was his beloved Night still in that corrupted body? The only way he could ever know would be if he became like him. If he asked, Nightmare would probably just lie about it.

-I hate him, he's N O T my brother, not anymore - Dream mumbled to himself still trying to process what is even happening anymore. All the emotions inside him were getting more and more hard to keep inside, he knew that Ink and Blue were afraid of him since his first breakdown. He remembered every second of it, he hurt them, both mentally and physically.

The worst part is that he didn't regret it, he enjoyed everything that happened every. Single. Time.

Was he even the hero anymore? All he wanted to do now is to destroy everything and everyone that's in his way. It wasn't right, but it felt good.

He started to cry and chuckle quietly. Was he insane? Maybe, it didn't matter anymore, he should kill them all. Kill them. Just get rid of them.

He got up, and left the bathroom still chuckling and letting his tears flow even though they blurred his vision.

Dream went to the kitchen and grabbed the dullest knife he could, he should make it fun. But at the second thought he also grabbed the sharpest one because Nightmare would be a harder opponent

First Ink, as long as he's sleepy it will be easy.

Dream entered his room quietly and walked up to the sleeping monster. Dream smiled and grabbed Ink's neck just to stab him with the dull knife making the skeleton wake up. But he couldn't move.

Dream was good with biology and a healer, but he could use his knowledge in another way.
For example stabbing Ink in the spine in such a way that his old friend couldn't move anymore.

-Good morning, sorry that I'm waking you up so early, I just have to do something really quickly.. I'm pretty sure you can do it for me. It's a matter in hell. Don't worry I'll take care of Blue. See you later! - Dream laughed taking the knife out letting Ink die in pain as his HP slowly got lower and lower. He just watched until his old friend turned into dust and a bit of black ink.

-It wasn't that messy.. I prefer when there's blood and organs everywhere - Dream complained about the death not being gory. He should try something different with Blueberry.

He felt watched the entire time, but couldn't understand what was watching him. He will know soon so it didn't really matter.

Dream left the room with dust on his hands, everything was so quiet you could hear the wind outside the house. The voices were getting into his head, he laughed while walking around licking off the dust from his knife.

He stopped by Blue's door and tried to open them.

Locked.

-you saw me kill Ink, didn't you? - Dream asked and laughed louder.

-ANSWER ME BLUEBERRY. - he yelled as Blue got further away from the doors.

-It doesn't matter, you're trapped in there. Your window can't open because the lock is broken, and the glass is hard to prevent someone from breaking in. - Dream slowly got away from the door.

-But you know that.. - Dream stopped and suddenly started rushing into the doors.

-DON'T YOU?! - He destroyed the doors, he was stronger than normally, what was even happening?

Blue fell onto the floor not knowing what to do. He couldn't give up and let Dream kill him, but what could he even do anyway..?

Dream got closer and closer with every slow step while Blue was paralyzed by fear.

Blue broke out of it, created a sharp bone from his magic to fight, but it was too late.

Dream charged with the sharp knife and the bone broke in half. Dream took the sharp part and put it through the weaker skeleton's eye socket while quietly chuckling.

Blueberry screamed in agony. Dream enjoyed every pain filled scream the monster made.

Dream picked him up by his neck and was holding it so Blueberry would choke on anything that was leaking from his mouth. Was it blood? Liquid magic? Dream didn't care, as long as it would make Blue die it was good enough.

Blueberry began to slowly turn into dust, Dream's smile only getting wider. But then a voice ruined it. Dream started to panic a little.

-Dream.. the hell are you doing..?! - a black tentacle grabbed him making Dream drop his dull knife he was holding. The grip was strong not letting Dream to take a breath.

Nightmare was more than shocked. He was woken up by Blue's scream, and expected everything but Dream to be behind this.

As Dream got weaker and weaker because of no oxygen his body stopped being so tense, and his aura slowly got back to normal.

That's when Nightmare realized that Dream was slowly getting corrupted and was losing his sanity everyday. He remembered dreamtale, how Dream was sometimes talking to himself.

Dream was always psychotic, it's just that back then he was taken care of, people treated him nicely, he had a brother right next to himself that would protect him.

But after the accident..
He was alone, and everything became a danger, everyone hated him for not protecting them, his beloved brother hated him and wanted him dead. Because of his loneliness he just surely got tired, and just gave in to the voices he heard, only these understood him unlike anyone else in this multiverse.

-I'm sorry.. - Nightmare dropped him and backed out still facing his brother.

Dream slowly got up and got closer to Nightmare who couldn't go anywhere else, he was in a corner.

Dream only hugged his brother who responded with hugging him back. Dream took out the sharp knife he still had and stabbed Nightmare in his soul.

-Goodnight little moon. - Dream blushed a bit and watched as his brothers goop faded away and the skeleton underneath dusted. Dream looked at the knife and stabbed himself.

-I love you brother.. I love you so much, I couldn't protect you then, so I'll keep you safe from everything in hell that we both deserve. - Nightmare pushed him away, he felt so weak, and betrayed. It was his fault it happened, he could have saved Dream and everyone he have killed in all those years.

The multiverse was now going to become a stupid place with no emotions and everyone living like machines. Slowly disappearing as the creators understand that something is wrong.

And now Ink was dead, so no one could stop Error, and because Nightmare died Bad Guys will surely try to take a revenge for his death..

It's funny isn't it? How everything can change in just a single night.