"Human… In your world, I can only be described as one thing… The Grim Reaper.." Papyrus spoke quietly. He dropped his hands and turned his gaze to Chara. They stood in silence, each one looking at the other. They were waiting for who would made the first move, but neither moved from their spots. Chara's knife had been coated in a strange and menacing black aura while Papyrus's eyes had changed colors, his right a nearly black color while his left a blood-red color.
"You know, I wish your brother had a transformation like this. It's kind of disappointing he didn't. That just showed how powerless and weak that guy was." Chara grinned as he taunted Papyrus by talking foul of his brother. He could visibly see Papyrus's body twitch when he said both 'powerless' and 'weak'. He only grinned wider and said, "I mean, maybe if he trained more or took his life more seriously, he'd have been able to do something. Maybe he's even have more than 1 HP," Chara shrugged, "and…" Chara stared at Papyrus with his red pupils that were engulfed in darkness and finally finished, "..he'd actually still be alive." There was a sudden increase in temperature. It wasn't hot enough to be physically irritating or burn intensely, but enough to notice. Papyrus lifted up both arms grasped the long bone that stood out in front of him. The bone was encased in a deathly black aura, just like Chara's knife, and grew a crescent on end. The crescent was purely made out of the read aura Papyrus possessed, but it had somehow turned into a solid object. The bone resembled a scythe now.
There was a low growl from the skeleton as he rested the bone scythe on his right shoulder, the blade itself being forced downwards. The darkness around the pair disappeared and that's when Chara knew Papyrus was going to attack. Purely off of instinct, not must predicting, Chara jumped back just in time to dodge Papyrus's attack. Instead of swinging the massive blade at Chara, he slammed the other end of the crescent aura on the ground. The impact was so intense that Chara could feel his entire body shake in the air. The ground itself cracked and broke from the sheer force of the blow. The cracks extended to the three pillars behind the human and completely shattered them to dust. The skeleton slowly lifted up his weapon. As he was lifting it up, Chara placed his feet on the wall, pushed his weight on them, then sprung off the wall like a compressed spring being released from its hold. Chara flew at an incredible speed. As he held the knife out in front of him, it were as if the air was being pierced and cut in half.
He swung the blade three times at Papyrus. One aimed at his chest, one aimed at his exposed spine, and the last aimed at his knees. The three strikes from his knife sent out three curved black projectiles made purely from Chara's aura of hatred. However, the were nullified upon impact. Actually, they never made impact in the first place, they simply vanished. Chara dug his knife into the ground to stop his acceleration towards Papyrus. When he finally managed to slow down to a halt, his eyes darted to the skeleton. He immediately saw that Papyrus was covered in his red essence. The strikes had barely made a dent into what looked to be a cloak of red.
That's when Chara finally noticed. He saw the cracks on Papyrus's skull. From Chara's point of view, Papyrus's right eye, the red one, had a massive crack extending from his eye socket to the bottom of his skull. His left eye, the nearly black one, sported a crack from his eye socket to the top of his skull. Though they were minimal cracks, they were noticeable. The bone scythe he held began to spin in a circle rapidly. Papyrus was spinning the blade around him and released the weapon. It flung in the air wildly before encasing in a black aura and charging directly into Chara's direction. With barely any time to react, he rolled forward and barely managed to dodge the attack, the blade cutting off just a slight bit of Chara's hair. Almost immediately, the whirling blade came spinning towards Chara once again. Chara jumped off the ground and leaned backwards in the air, the blade just inches away from the back of his body. However, he jumped slightly too early and the blade cut half an inch deep into the back of his calf. He placed both hands on the ground and pushed himself back onto his feet. He winced at the sharp he felt from the impact of the yelling.
"What the fu-" Chara ducked to dodge the spinning scythe, "-ck! This is so unfair!" Chara yelled at Papyrus, quite angrily too. Papyrus, however, took no attention to him. The blade continued to move around sporadically while Chara danced around it. He would duck under it, jump over it, and dash to the left or right to simply avoid it, all the while gaining small cuts all over his body. Chara was soon panting from the lack of energy. All of the movement being dispensed was finally taking a toll on him. Sure, he's super-human, but so is Papyrus.
The scythe finally ceased its assault and began to idly float above Papyrus's body. The whirling slowly died down and when the bone became visible again, it completely stopped when the skeleton seized the bone's length. Papyrus looked down at the red aura that made up the blade. The aura itself was oozing a crimson smoke that became visible if held still. He noticed it was the same for the length of the bone itself. Papyrus slowly slid his index finger down the cracks on his skull and gave-way a quiet sigh.
"It seems as though I'm still not capable of maintaining this form. However, I shall sacrifice everything I have to stop you where you stand so you won't finish this world." Papyrus firmly grasped the bone scythe and charged forward at such a high speed that he left behind a visible shadow of himself that faded almost as soon as it appeared. With barely any warning or time to react, Chara, once again off pure instinct, dropped to the ground. His back roughly hit the ground, but he managed to dodge the swipe Papyrus made that would have cut Chara in half at his stomach, but he did gain a new cut on his forehead, exactly in the middle of it.
The point of the blade twisted so it aimed down at him, but didn't move. Chara had pushed his knife right against the intersection of where the red aura met the bone. He was barely able to hold off the strike. Slowly, the blade was descending and Chara had no way to escape. Black shadow-like arms began to sprout out from Chara's shadow and they grabbed hold of the scythe and of Papyrus. The vile looking arms wrapped around his entire body. They twisted and turned all over his chestplate and his boots, firmly holding him to the ground. The locked his arms and legs into place to prevent him from moving. He was utterly and completely trapped.
Chara rolled to his left and hopped back up to his feet. He wobbled slightly, but regained his balance. Slowly, he walked over to Papyrus who was now stuck due to the black arms that held onto him tightly.
"Well, sorry spaghetti maniac, but I have a king to kill and a world to destroy. I think you've held off my appointment with Asgore long enough, don't'cha think?" as Chara said all of this, he had a twisted and menacing grin all over his face.
"King Asgore... Sans… Undyne… Everyone..." Papyrus released his grip on the scythe as it clattered loudly on the floor in this deathly silence. The aura around it, including the aura that made up the blade, vanished instantly. "No, this is not where the Great Papyrus will perish.. Not by your hands." Papyrus began to struggle against the arms. He was winning the battle of gaining his freedom. His arms were slowly lifted up into the air. He could hear the darkness they were comprised of snap and break. However, Chara simply smiled and looked down at Papyrus. They both knew this was going to be the end.
Inside the mind of Frisk, well, Chara now, Frisk laid in the abyss still. He hadn't even bulged, but could see everything that Chara could see. He knew that Chara was having the time of his life. Frisk hated it all. He hated hurting the innocent monsters. He hated doing this to Papyrus. He hated killing Sans. Most of all, he hated every trusting Chara. Frisk's body twitched on the ground. His fingers slowly curled into a fist, then back into an open hand. His arms began to move. The sound was terrible. It sounded as if something was being ground against sandpaper. He laid his hands flat on the ground and pushed the dead weight of his body up into a sitting position. He nearly fell back on the ground a few times, but managed to sit up straight. Frisk looked up. There was a massive shadow that engulfed him from the light. He saw a pure white skull with two major cracks on them. Instead of being afraid, Frisk managed a smile and muttered out two words.
"...Uncle Gaster…"