Nightmare Sans, he looked so immensely shocked and stunned at what he is seeing before his very eyes. He has seen Sans use his powers of Evolution, and while he does admit that while it is impressive, it is nothing compared to Nightmare's power over using the Black Apple in order to use the negative emotions of other people to empower himself. But this...this is an entirely different part of Sans that he had never known existed. And to make things worse, when he senses its power...it didn't feel like Evolution at all. In fact, it didn't feel like any power that he has known of for a very, very long time. It felt way more different than ever. Too different to be a part of the Multiverse, almost as though it is from something else of its own. Nightmare stepped back, as he looks at Sans in his new mismatched eyes, with his Left Eye looking at Sans' own left eye, which is of a large red iris and aqua green pupils. The power that he senses from this thing that Sans has become...it is unnatural. Not to mention very destructive. More destructive than even Error Sans himself, and Nightmare knows how powerful Error Sans is, due to his status of being a Sans that destroys. But this entity that he is seeing before his eyes, it is more stronger than him, somehow, as his powers are nearly unparalleled. But Nightmare is not simply going to let this monstrosity outclass him and do whatever it wants with him. He steps forward, as he than spoke out.

"You may have a new trick up your sleeve, CELL, but you are still nothing compared to me!!"

He than extended his tentacles to try and attack Sans, stabbing him in the chest in order to cause a lot of agony to him, only for Sans to look at the tentacles, and used his own blades tentacles to slice up Nightmare's tentacles to small bits. And to Nightmare's shock, it happened only in a spot second, and he didn't even see the tentacles that Sans now has move, until it went through to the other side. Sans looks at Nightmare in the eyes, as he spoke out.

"YOU CANNOT WIN AGAINST ME, NIGHTMARE. GIVE UP."

Nightmare flinched at the way that his voice sounds to him. It sounded corrupted, and almost like it is very loud, magnified to the sound of a volcano eruption, and yet, Sans does not raise a single voice out to him. Nightmare snarled, as he than spoke out to Sans.

"I am not going to give up easily, CELL, your suffering is mine!!!!"

He than charged at Sans, as Sans raised his tentacles a little bit, and blocked the attack, as more and more spiked tentacles came out from his back. He than stabbed and hit Nightmare with them, as Nightmare continues to get sliced and diced to bits, only for him to regenerate and heal. Feeling rather annoyed, Sans than looks at Nightmare in the face, and fired a red beam with a small Aqua Green like in the center, and it his Nightmare square in the face, sending him flying, and causing so much agony to the Guardian of Negativity, as Sans spoke.

"HAVE YOU HAD ENOUGH YET, YOU FOOL?"

Nightmare returns back to Sans, a look of anger on his face present, as he spoke out.

"Not quite, CELL. Not at all."

He than launched more and more tentacles at Sans, as Sans than used his own tentacles to slice them up. He than charged forward, and tries to grab Nightmare Sans at the face only for Nightmare Sans to dodge the attack, and launched a powerful punch at Sans, sending him flying forward a little bit, until the black tentacles made into wings, and he stopped into the air, before he lands on the ground, and he turns to look at Nightmare in the eye again, with an unamused expression now present on his face, as he than spoke out to Nightmare.

"IS THAT THE BEST THAT YOU CAN DO? IF SO, THAT IS OUTRIGHT PATHETIC OF YOU TO DO IT."

Sans' personality is also much more different than ever before. He sounds cold and cruel, and he seems to be looking down at Nightmare Sans, almost as if he is an inferior being without a life that he can gain. Needless to say, Nightmare is not happy of the way that he is being mocked at, as he than spoke out.

"Grrrrrrr...I'll show you!!!"

He than charged and went as fast as he can to Sans, and punched him in the face, and he repeatedly punched him, before he than used a tentacle to stab him in the stomach, though he did not stab the CELL Core. Nightmare smiled...but than, the same red cosmic laser fired out of his left eye, and spit the tentacle, as he took it out of his stomach with no bad effects whatsoever. Sans looks at Nightmare in the eyes, before he extended his hand, and his hand turns into a black tentacle, which he than used ti who Nightmare as hard as he can, and sends him flying backwards into a tree, and the smack of the black tentacle actually manages to hurt Nightmare as much as the Red Laser had done.

Nightmare stood up from the ground, and he looks to see Sans looks down at him again, clearly not impressed with how weak he is compared to Sans himself, and that is if this is Sans that is in control of the body that he is in. Nightmare stood up, but he felt negativity being absorbed into his body, as he grew a bit more stronger than ever before, as he than charged at Sans as much as he can, and used a tentacle to hit Sans in the head, which only succeeded in stinging his head instead of causing a lot of pain to him. Clearly, whatever form this is, Sans is on a whole new level while he is in this form. Sans than looks at Nightmare with unamused eyes, as he than crouched down to the ground, before he then leapt at him, and he reaped his fist back, before he punched Nightmare as hard as he could, right in the face.

Unbeknownst to Sans and Nightmare, as well as Ravel Phenex and Atla Fayon, who are watching the fight, there is another person that is observing the fight, hidden in the shadows of the forest, and is standing on top of one of the branches of the trees. The figure is of a tall person, at the height of 8 feet. He is wearing a coat that is similar to Sans, being long with a fluffy hood and scarves. But that is the only thing that is similar to that of Sans. In fact, this Sans' coat is colored red with black wrists on the coat's sleeve. Below the scarves, at the lower part of the back, are 2 large pair of arms, that are red with claws that are big enough to grab a person by the torso, and a tail that is similar to a devil's, with horns on the top of his head. The fluffy part of the scarves are also covered in eyes, with the eyeballs being with with red irises. And the irises themselves are not even normal shaped. They are in the shape of a gem, the same gem that Sans has on his coat. The pants are also long, covering the entirely of the legs, and the coat goes down to the ankles. The scarves are golden in color, and the slippers that are on the feet, they are red with 2 black eyeballs on the top front of the slippers. The skin of the entity is red, and the main hands of the entity are red with claws as well. The face of the entity is also red colored, with teeth that are shape and jagged to like a shark, and has 3 eyes with the same gem-shaped iris, although there are also aqua green pupils on them. 2 of them are in the same spot as a normal person's eyes, whine the third one is on the forehead. The torso is exposed from the coat, and in the chest part is another eye, and on the stomach...is a large mouth with a large green tongue that is more sharp and jagged than the mouth that is on the head, with the mouth in the stomach smiling at the sight that is before his very eyes. In the place of where the gem on the coat should be, is a gem-shaped eye, wit the same gem shaped iris. On the palms of his claws hands, are eyes worn teeth that acts as the eyelashes, except that they smoothly bend over the eyes themselves.

And the power of the entity is immense. If he had released it to show himself, he would simply be using only 0.00000001 percent of his power to make it as powerful as an average monster. And it would still be like that if used against a powerful as strong as Error Sans, who is an immensely powerful Destroyer of the Alternate Universes. But if he were to raise the percentage of his magic even higher, making it more known to anybody else that is present in the area that he is inside of, than it would have a dire consequences on those that are not strong enough to handle it. It will not kill the persons that is in the radius of his magical aura, but if they are exposed to it, and are effected by it, the person effected by the power of the aura that he possesses will wish that they are still able to die, due to what it does to them. And his powers are even more bizarre, especially with what he could do to the battle next, if he had despised to step into the fight to intervene. The only reason that he is not intervening, is because he simply wants to observe wha this happening right now.

The entity calmly, quietly looks down at the fight, more specifically, at Sans, the one with the red left eye and the black tentacles, and he observed as silently as he can, as he looks to see how powerful it is. He won't deny it, though...he knows very well that this is not Sans, but rather something else, and his power is immense. It might someday become enough to push him into using more of his power, than even the strongest Sans that exist in the whole entire Multiverse, as he than spoke out soft to himself of this scene.

"SO, IT APPEARS THAT THE MALESGROW EYE BUG HAS BECAME SENTIENT ON ITS OWN, AND IS NOW FIGHTING AGAINST NIGHTMARE. I WONDER HOW POWERFUL IT IS, ESPECIALLY SINCE IT HAS BOTH THE SOUL OF EVOLUTION, AND THE CONDUIT SOUL OF LIFE TOGETHER, ALONG WITH THE EYE BUG NOW HAVING GAINED A WILL OF ITS OWN.FOR NOW, I AM GOING TO SPEAK TO SOL ABOUT THIS. ESPECIALLY IN REGARDS TO THIS NEW, MAIN VERSION OF ABYSS SANS, NOT THAT THIS VERSION WOULD MATTER TO HIM ANYWAY, FOR IT IS SIMPLY BENEATH THE NOTICE OF THE GREAT UNNAMEABLE. BUT THE MALESGROW EYE BUG EITH BOTH POWERFUL SOULS, IT IS SOMETHING ELSE ENTIRELY. IT PERHAPS MAYBE EVEN MORE WORTHY OF ATTENTION THAN EVEN MALESGROW HIMSELF, MORE POWERFUL THAN MALESGROW HIMSELF."

The entity than vanished without a trace, as if it had never visited the snowy forest in the first place, hopping to see Sans and fight against him in order to see how powerful this entity is.

Back with Nightmare and Sans, the both of them are fighting against each other in a very fierce fight, and needless to say, Nightmare Sans cannot believe that he is having a very bad time trying to deal with what is seemingly a unique Sans. He thought that he was going to be weak enough for Nightmare to take and torture him. But instead, he is now facing off against a monstrosity with powers that are far beyond his own. And it is something that he simply just cannot believe this easily. Lucky for Nightmare, though, he has grown powerful himself by having been able to absorb the strength of the Negative Emotions that Sans had, which made him more powerful than ever before, and it is allowing Nightmare to stand his ground against this version of Sans that he is fighting before his eyes. But even that is not easy, due to the fact that his powers has increased to an alarming degree. And even now, it is still increasing, becoming more and more powerful with every hit that he does to Nightmare, as as he continues to fire his eye laser at Nightmare, which causes a lot of damage to him, and even made Nightmare explode once. But Nightmare is still able to regenerate, as he than appeared right above Sans, and slammed his fist down to the ground, sending him crashing down to the ground hard. But Sans rose up from the ground, and made a bunch of electrical spheres, the same ones that he had made when he was surrounded by the dome of energy, except that unlike the last ones, these spheres are red in color, and look far more deadlier than the unpowered version of it. He than launched the Red Spheres at Nightmare, who made a bunch of tentacles to block agains the attack. But the Spheres exploded very violently, destroying the defense that Nightmare had, and hitting Nightmare in the main body, causing it to explode and splatter all over the place. As Sans landed on the ground, though, he looks down and sees that the black stuff they made Nightmare's body began to regather at the position that Nightmare had stood in, as Nightmare than began to recollect and reconstruct himself with the black slime that he is made of. Nightmare snarled with pure anger and rage at the sight of Sans, as he than spoke out.

"I do not know how you had gotten this much power, but I am not going to go down this easily!! I will make sure that you pay for how much you had humiliated me!"

Sans than looks at Nightmare, as he than spoke out.

"THE FIGHT THAT YOU ARE IN HAS DOOM YOU FROM THE START, BEFORE IT HAD EVEN BEGAN. LEVAE THIS PLACE, AND I WILL LET YOU LEAVE WITHOUT FURTHER HUMILIATION OR PAIN. IF YOU DO NOT LEAVE, YOU WILL DIE, AND I WILL MAKE SURE THAT THERE IS NOTHING LEFT OF YOU TO BE REMADE RVER AGAIN."

But Nightmare, being Avery stubborn and persistent Sans that he is, spoke out.

"I am not going down, not now. I am not going to stop until you pay."

Sans glared at the Guardian of Negativity before his eyes, as he than spoke out to him.

"WHY DON YOU COME AND TRY ME?"

He than summoned an Abyss Blaster, but it now has black tentacles coming out from the eye sockets, with a red left eye on each of them, before he than fire them at Nightmare Sans, who than got hit by the attack. Instead of the attack simply being Aqua Green, it is now red with the middle part of the blast Aqua Green, and it caused way more destructive damage then ever before.

Nightmare Sans got angry, as his left eye began to glow brightly, as he than looks at Sans, his tentacles moving more in a threatening way than ever before. He cannot believe that he is having so much trouble against a single Sans, and too him, very few have been able to match him, and only another very few have been powerful enough to surpass and even nearly kill him, and these few are on a level more greater than Error,

Ink,

Dream,

and himself. So to see a Sans that is like this is an outrage to Nightmare Sans, who than raised his tentacles a little bit more than ever before, as he than tries to stab at Sans, only for Sans to made a red crystal wall, and the Tentacles are unable to pierce it, in fact, they seem to be useless against the red crystal that Sans has made, as Sans than teleported in front of Nightmare, and punched him as hard as he could in the face, which sends him backwards. Nightmare landed on the ground, as he than tries to stand up, and has dodge Sans, who has tried to stab Nightmare with a bladed tentacle. Nightmare then stood up from the ground, and looked at Sans in the eyes, as Sans looks back, as Nightmare and Sans stared at each other, and both Ravel Phenex and Atla Fayon looked shocked at what they are seeing before their very eyes.

They cannot believe what they are seeing before them. They had seen Sans powerful, sure, but not to this extent. This is beyond what they had known Sans as being capable of doing. But Atla can tell that there is something else in play. She can see that Sans...he is not acting like himself, like it is another entity that is in the place of Sans. But despite this, she can sense that Sans is still present, still in there. As he is fighting to protect them.

Sans then fired a bone that is black in color with ansi glow red eye. The eye nearly hits Nightmare, but he dodged it. But it is only after 4 seconds that the bone began to glow and explode with red energy coming out in 10 directions, and some of them were able to hit Nightmare directly. Needless to say, Nightmare cannot believe that he is having immense trouble in such a way, as Nightmare then turns around to face Sans, only for Sans to make a punch at Nightmare, and even though he is far away, it made an Aqua Green projectile come at Nightmare, as he than spoke out.

"EVOLUTION PIERCE!!!"

The Evolution Pierce lived up to its named, but piercing through Nightmare's body. If he was simply a normal monster, he would have been killed on the spot. Nightmare Sans smiled, as he than spoke out.

"Try handling against this."

He than raised his arms, and than summoned an army of Papyruses, but they are black in color with shape jagged teeth.

Needless to say, these Papyruses are huge in numbers, as Nightmare smiled, before he than spoke out.

"How do you plan on dealing with that, CELL?"

Sans than looks down at the ground, as he thought for a minute, before his eyes widened. His chest began to glow, but it is not from the CELL Core. Inside of his body, is a Soul, upside down, with an Green Color, and a black vertical center of the soul is present. Inside of the Black Vertical Line, is a Red Eye, with black tentacles having wrapped around and fused with the soul all over. The ground then erupted, and out of the ground appeared Black Colored Papyruses with a left red eye of their own, and tentacles, 10 of them, coming out from the back, as Sans looks back at Nightmare Sans, and spoke out in a smug smile.

"I'M SORRY, WHAT WERE YOU SAYING TO ME JUST NOW?"

Nightmare could not believe what just happened, before he than snarled a little bit, as he than spoke out to Sans.

"I've had enough of you!!! My minions, attack!!"

The Papyruses on Nightmare's side begs to charge, as the Papyruses on Sans' side charged as well, and it is when it became one heck of a violent fight, as the Papyrusea began to claw, scratch, punch, kick, rip, tear, and bite at each other as painfully as possible, as Sans and Nightmare went into combat again in order to try and give one another as much pain as they both are able to dish out. Nightmare tries and was able to succeed int being able to stab Sans in the stomach, only for Sans to stab Nightmare back with his own bladed tentacles, as Nightmare and Sans stared at each other, anger and frustration filled them both, though Sans is much more restrained, before a Fireball came out of complete nowhere and struck Nightmare at the side of his head. This made him get launched out of the way, as he then crashed into a tree, and was hurt a little bit from what had happened. He than looked to see that it is none other than Ravel Phenex, and her eyes began to glow with a lot of unhappiness present in her face and her expression, as she than spoke out to Nightmare.

"How long will it take for your to finally leave us be?"

Nightmare than got up from the ground and spoke out.

"Until I finally decide it is."

He than launched up at Ravel and tried to hit her very painfully. But Ravel Phenex than made a shield with a magic circle, and blocked the attack, and surprisingly, the magic circle is much more powerful than ever before, due to the fact that the CELL inside of her soul has increased the power of her magic more than ever before. Ravel Phenex than launched another Magic Circle in the air, and began to rain down hellfire form above, and it began to hit Nightmare and the Papyruses that are fighting each other, destroying them, while Sans simply hides right underneath his tentacles, in order to not get hit by the Evolved Hellfire that Ravel Phenex is using to try and cause a lot of damage to Nightmare as much as she can. When the raining Evolved Hellfire rainstorm was done, the snow on the ground has been shown to have melted, though a bit more has covered up the spots that had been exposed, as Nightmare than stood up, and he looked a little bit angry at Ravel Phenex, as he than spoke out.

"You are going to pay for that!!!!"

He than leapt as fast as he can at Ravel Phenex, in order to try and attack her, but than, Nightmare Sans is met with a fist to the face, as Nightmare is then sent flying into another tree, and he got up from the ground, only to see that it is none other then Atla Fayon, her fists clenched, as she spoke out to Nightmare.

"If anyone is going to give you pain, it will be me."

She charged at Nightmare Sans, and revealed her fist back, which glowed an Aqua Green color, before she hits Nightmare Sans in the face, as he than was launched into a bunch of trees, before he then landed onto the ground. Nightmare Sans than stood up, and he sees that Atla Fayon is rushing at Nightmare, and Nightmare began to use his tentacles to try and stab Atla Fayon from above. But Atla Fayon sensed them coming, as she than avoid and dodged the attacks that were attempted onto her. She than jumped into the air, and she landed a very hard kick in the head, sending him flying to another direction. Nightmare then stood up, and saw that Atla Fayon has leapt to try and attack Nightmare again, but this time, Nightmare was ready, as he then swung his tentacle and succeeded in being able to hit Atla. Though Sans had teleported fast and was able to catch her, as Sans puts her down onto the ground, before he than looks at Nightmare in the eyes, as he fired his eye laser, hitting him and causing him a lot of pain, as Nightmare snarled, with Ravel Phenex landing beside Sans, and her hands opened up, manifesting a bunch of Magic Cirlces, ready to strike. Nightmare snarled...but he than sensed something...as he spoke out.

"It seems that one of my minions has finished his Genocide Run."

He than smiled, as he looked at Sans in the eyes, before he than spoke out.

"Hm. break time is over it seems, oh well. It's a shame I won't be able to see you with all of your powers. We will see each other again in the future. Make it more interesting, CELL."

Nightmare then teleported out of the AU that Sans and the others are still in, and Sans puts Atla Fayon down, as he looked like he has become very exhausted with what it is that he has done. And than...the red iris began to vanish...and after that...Sans had fainted, and blacked out.