Tyrant Xilian enters the Undertale Universe

Incapable of finishing his task in this timeline, Dust Sans decided to take it to a different timeline, however, as Dust was about to take off, Nightmare's blob stopped him. Dust turned around, not knowing it was Nightmare as he formed 7 gaster blasters. The blob formed into Nightmare as it stared at Dust with an annoyed expression "IS THIS HOW YOU TREAT YOUR KING?!" Nightmare shouted out. Dust's hand lowered, looking embarrassed and intimidated. "No, I am sorry." said Dust, his voice a little more quiet. 

Nightmare huffed out, his tentacles wriggling behind him as he put his hand on Dust's shoulder. "You will be getting someone who will help us, someone who will be our replacement if one of you falls." Dust was confused as he asked "And who will that be? He better not be another one of your freakish monstrosities." Nightmare just grinned. "Oh you'll see, I promise he has a wonderful connection with his brother, just like you have with yours."

Nightmare opened a portal towards the special timeline, Dust was hesitant, but he went in either way. The portal closed behind him as Nightmare then vanished into the ground.

Dust, looked around and was met by what looked to be a snowdin town. "This place is deserted, just like the previous timeline.. Is this supposed to be happening nowadays?" Dust muttered as he walked down the ravaged snowdin town. Bones were impaled into buildings, windows shattered and there were craters of destruction visible everywhere. Dust continued walking, his guard up in case anything jumped on him.

In his home, was the creature that Dust needed to retrieve, he looked to be playing as he had a wide smile. Everything looked normal to the creature, but the sight would be different to others. "Say Papyrus, what do you think of this?" He said, showing Papyrus a figurine made out of sticks, moss and pebbles. Papyrus, standing there just responded, their smile not present and their attitude not as lively as it should be. "It looks good brother, but please wake up from this nightmare and set me free.."

The creature resembled a sans, his bones looking a darker shade of gray as his outer pupils were a more light red with the insides getting whiter. His clothes also had a darker shade than usual, as his attention was then taken away. "Hush now brother, someone has come to visit us." Papyrus, not bothering to stretch out his hand, started to fade away like a puff of smoke as everything started molding back into reality. The house was burnt down, mossed over and in shambles as there was no Papyrus standing there, instead, a skull of Papyrus with a bone stuck through the top of their skull.

As the creature walked out, his grin grew wider as visible determination stained his teeth, clothes and arms. The determination awfully resembled blood as the top of his skull was ripped apart with three claw marks. "This is going to be so exciting, I can't wait to meet them. What about you Papyrus?" The skull remained silent, not uttering a word as the creature's name awfully fit the scenario he was in.

Insanity!Sans

HP: 8000

ATK: 66

DEF: 99

*A determination experiment that met a fate worse than death

Dust stopped, his hood covering his face as only his pupils were visible through the dark. "There he is." He said, smirking as he could feel an uneasy pain in his soul. "Gh- Do I have to have more problems?!" He looked at his soul, seeing the red tint have a little black and purple vines growing on the sides. "Shit, I don't know what the hell is going on, but I reckon it has to do something with the Alphys I took out." As he looked forward, he saw the silhouette of Insanity approaching.

As they both came closer to one another, the intensity between their two presences clashing was so intense that it formed an invisible bubble of hot air. The snow under both their feet started melting rapidly as Insanity just kept his wide grin. "Look, look! There he is brother." Dust, surprised he still had his brother asked. "Brother? Ohoho, now I am curious where your brother is." Keeping his hands in his pockets, he was ready if Insanity pulled out a dirty trick.

"Here! He is right here, come say hello!" He pulled out the Skull of papyrus as its closed eyes slowly started opening up. Thousands of cries yelled out into Dust's mind as Dust's eyes were set aflame, he took out his arm from his pockets and into the sky with such swiftness he nearly ripped off his own jacket. A massive bone uppercutted Insanity's chin which sent him flying to the top of the mountain. Insanity's teeth broke as he let go of his brother's skull which Dust immediately picked up with a hint of sorrow.

Phantom papyrus appeared next to Dust, putting his hands on his shoulder. "BROTHER, I BELIEVE WE NEED TO PUT THIS PAPYRUS TO REST." Dust, without a word, summoned a trident as he set the skull to the ground. Moments after, he impaled the skull as its bound soul cracked, shattering violently. The voices in Dust's head stopped immediately, thanking him.

"We are going to murder and erase that fucking scum." Said Dust, completely ignoring Nightmares orders of getting Insanity as the ally.

Dust Sans LV ?? 

HP: 12000

ATK 99

DEF: 40

*Attained a new power of which increased his statistics tremendously.

As dust stood his ground, the entire mountain began rumbling. On guard, Dust looked around only to get blinded by a bright light that was coming straight from the sky. An incredibly loud roar echoed through the open underground, vibrating the walls of the mountain which tore down building sized stalactites from the top of the mountain. Insanity was bolting down from the sky like a meteorite, his clothes burnt off completely as his skeletal form was completely revealed with his soul of determination.

Dust, clenching his hands formed out thousands of fireballs that moved in zig-zag patterns, impacting Insanity forming a ball of highly concentrated fire. Insanity ripped through the ball of fire, like a wild animal, clenching his fist and preparing it for a devastating punch.

Dust formed out layers and layers of gaster blaster shields whilst also infusing them with spears to make them be covered in spikes. Insanity blew his fist straight through the shields, punching Dust's face with such an impact that his body spun in the air. Dust opened his mouth as he was spinning so fast his body formed an illusive circular shape, he then bit down and summoned a gaster blaster to stop his spinning. He impacted it, cracking its shell as Insanity just went in for a bite, not uttering a word. Dust pointed his finger to the right as blue magic enveloped Insanity, stopping his movement.

Dust got on his legs, but Insanity broke out of the blue magic hold, clearly holding superior power.

Insanity!Sans (Determination Unleashed)

HP: 80000

ATK: 666

DEF: 999

*A wild animal loose, ready to ravage its prey.

Dust, looking intimidated by this sight, didn't back down as he summoned hundreds of blasters all over the place. All the blasters fired in unison, whilst Dust just threw hundreds of heat tipped spiky bones, tridents and spears. Insanity took the brunt force of everything as his eyes flashed a deep blood red. The beams became distorted and bent unusually as the bones, tridents and spears started slowing down mid-flight, Insanity, full of unbridled rage, unleashed such a violent roar that it disrupted everything.

Dust's body flashed a dark color, as he had been holding back a newly attained power. "Let's see just how much you'll struggle." Said Dust, his face becoming pitch black as his teeth were completely white, his eyes also being one of the only things you could see from under the hood.

DustDust Sans (Suppressed)

HP: ???

ATK: ???

DEF: ???

*A harbinger of death, unleashed to this world.