Reverse the Reverse Potion (Fgod Error)

"B-Brother?" Dream looked at Nightmare as he trembled in fear as he saw his twin, bleeding in front of him. 

Nightmare was now unconscious, but not dead yet.

Dream walked towards the pile slowly, trembling.

"You can't go near us! For all we know YOU caused this!" Killer shouted.

"N-No! Why would I do that?" Dream said, Nightmare may be evil but he still cares for him.

"You still can't touch him!" Killer shouted as Dream flinched.

"I just want to help!" Dream spoke, with tears in his eyes.

But his efforts were nothing, it was like the past, 

̶a̶f̶t̶e̶r̶ ̶a̶l̶l̶,̶ ̶i̶t̶ ̶w̶a̶s̶n̶'̶t̶ ̶t̶h̶e̶ ̶f̶i̶r̶s̶t̶ ̶t̶i̶m̶e̶ ̶t̶h̶i̶s̶ ̶h̶a̶p̶p̶e̶n̶e̶d̶.̶

"Brother, no! Don't do it!" Dream spoke as he was trampled by the villagers, with his brother holding a black apple.

But his efforts were nothing.

Dream shook his head back to reality and proceeded to get some food and bandages.

"If you don't want me to go near him, at least take these." Dream offered the stuff to them.

Killer was still eyeing Dream suspiciously. But the others persuaded him to take it, for Nightmare's sake.

"Fine." Killer snatched the items and they all tended Nightmare's wounds.

Nightmare's HP began rising, healing him quickly with all the negativity and the items.

"T-h-ank you.." Nightmare tried to speak to Dream.

"You're welcome, Nightmare." Dream spoke, emotionally exhausted and with all the negativity around, he fainted.

"Dream!" Blue shouted as he caught Dream before he hits the ground.

----

Dream woke up, now in a bed.

Nightmare, who is patched up, and the others were beside him.

Dream tried to get up, but fails.

"Don't try. You can't stand with all the negativity in the multiverse right now. Blue filled me in with information and I have to say that was a stupid idea to give Error a potion." Nightmare spoke.

"But- I need to help- I- can't be useless-" Dream said weakly.

"You did your part. Just lay down." Nightmare spoke, stopping Dream from even trying to get up.

"But-" Dream said, trying to protest.

"It's not about us, it's about the multiverse. We need to put the past away for now." Nightmare said, knowing why Dream is doing this.

"How-" Dream spoke. Then he remembered about Blue. He didn't expect Blue to tell Nightmare that as well.

"How would about a temporary truce for the time being?" Nightmare said. He doesn't even need to attack au's with all the negativity around.

Dream hesitated a bit, not sure if this is a trap.

But they need more allies to defeat Error, and they are desperate, with all the aus falling.

"..I accept the Truce." Dream agreed.