Tyrant Xilian enters the Undertale Universe

"Hey smiley trashbag, who the hell are you trying to impersonate with that halloween outfit?" Chara snickered. From afar, the same hooded figure which had met Xilian ever since his arrival, had been observing, making his presence unknown to them. Frisk didn't do any gestures, they just stood there attempting to move their body, but their very cells and soul were sending danger signals through their whole body.

Tyrant Xilian (Heavily Suppressed)

HP: 75 000 001

ATK: ???

DEF: ???

Chara looked over at Frisk, slapping their faces. "Get your head in the game! We-" Xilian cut her off, grabbing ahold of their face as he dug both their heads into the roughed up ground. He spun around to dig his heel against their chins. The impact caved the entire surroundings into them. The two lunged out as Chara swung their scythe over their head and slashed downwards. Xilian looked up, his body forming multiple copies of himself. The copies copied the exact movements of the original as they then merged together with him.

Xilian grabbed ahold of the scythe's tip, gripping against the sharp tip, his bone-like hand being too tough to get cut, Chara's eyes widened as her whole body felt like it got pulled by an immense force. Chara and her scythe both got swung around as Xilian then threw both of them at Frisk. Frisk, like a wild animal, went on all fours and flash stepped all over the place, dodging the throw. Xilian's head followed her movements perfectly as his head looked like it was a blur.

Frisk opened their maw, their sharp, dagger like teeth glistening. Xilian slammed his heel against the ground, forming a violent impact blast behind him, he swung his fist forward straight into Frisk's maw. They dug their teeth down as hard as they could, unable to penetrate through Xilian's fist. They quickly opened their maw, using their legs to kick Xilian's side of the head. He let himself get flung to the side as their confidence grew, Frisk clenched their fists, forming bladed gloves. Chara landed beside Frisk, regaining her balance.

"This trashbag is tough..He is unlike the scrapyard we fought and my weapon can't dent his bone at all!" The two looked at each other. "We need to unleash all of the determination we have and merge our souls together." Frisk nodded, as they grabbed ahold of each other's hand, their bodies beginning to glow a bright crimson, Chara's body was confused by a mixture of black and red, whilst Frisk's body glew a bright white and red. Their bodies turned into pure energy of determination, the chaos within them allowing them to merge perfectly. 

A beam of maroon colored light beckoned into the sky. Outside on the surface, there was already human watching with the news helicopters floating around what was going on. The country's military had already been advised of the situation as the police force had already set up a large perimeter around the mountain.

Within the light, a fusion between Awakened Frisk and Chara was created, their imperfections now complimenting one another as they now stood at an incredible height of 7ft, bearing 4 eyes as they wielded a weapon which can switch between a scythe and close-combat bladed gloves. They adorned a glorious battle robe with the deltarune sigil implanted in the middle. On their head, a coronet was downed upon them as determination-like electricity surged through their arms.

Chashkal, the Determination Perfection

HP: 800 000 000

ATK: 340 000 000

DEF: 180 000 000

Xilian walked, unphased by their sudden change in appearance. He grabbed ahold of his clothed up mouth, ripping open the skull just so he could speak, the cloth dangling as he then let out an echoing groan. "Foolish gnats, are you unaware that the only reason you came to be..Was because of ME?!" Xilian disappeared as hundreds of afterimages formed around Chashkal.

Chashkal smirked cockily "Yeah, yeah, shut your mouth you bone bag." As the afterimages approached Chashkal, their scythe dematerialized and formed into miniature scythes which tore through each afterimage. The same scythes then went on full assault mode against Xilian, ricocheting off walls and moving in unpredictable patterns, Xilian moved around viciously, redirecting each scythe that came his way with his glance. As he formed in front of Chashkal, Xilians radiating green eyes impacted their body with an invisible force. 

Chashkal took the brunt of the force, ripping through the entire mountainside. The outside rumbled as each impact made a powerful earthquake which destroyed a majority of buildings in the city. Chashkal spun around, their battle robe releasing sharp blades everywhere like a maelstrom. Xilian took them face-first, getting some stuck to his body as they then detonated into large explosions. The explosions vaporized everything within them, each one yielding the explosive range of an atomic bomb.

The civilians outside got completely vaporized and the onlookers from the city looked terrified. Each explosion rippled violent shockwaves which obliterated entire parts of the city. Chashkal laughed, their arms ripping apart in a gruesome way and splitting in two, giving them two extra arms. "NOW DIE, YOU WEAK SHIT!" Xilian got pummeled by thousands of blows from Chashkal, each one being directly pointed into one region of his body. 

Xilian recovered in an instant, looking up only to see hundreds of manifested energy fists heading his way, his gaze tore the fists apart. Xilian's arms began to vibrate violently as he sent his own condensed air punches back, he then flash stepped to the side, clasping his hands together to form a golem out of all the destroyed debris. The golem let out a violent roar, blasting its massive fist down onto Chashkal.

Incomplete Chaos Golem:

HP: 1 200 000 000

ATK: 180 000 000

DEF: 200 000 000

Chashkal grunted, digging his arms into the golem, he lifted it off the ground mid-flight and decided to suplex it with just his core strength. The mountainous golem impacted the ground violently, causing worldwide tremors and cataclysmic events. Xilian looked at his arms, noticing some cracks forming on his bones, however, the thrill he felt in this battle is what he was made for. Xilian's body got coated by a scarlet jacket of light as he went completely rabid.

Lunging from rock-to-rock, he became so fast, that the very rocks he lunged off of became so superheated that they melted from even a picosecond of contact. Chashkal's eyes struggled to follow his speed as at the pace they were moving, everything around them was completely motionless. Chashkal summoned black humanoid skulls with their eyes completely gauged. They all let out an ear-wretching scream, distorting the soundwaves and light around them. This made the distorted soundwaves and light to become danger zones.

Xilian tore right through those pockets of distorted space, resulting in his clothes to be cut into ribbons. Chashkal's eyes widened "That fucker just went through- GRA-" Xilian latched his hand into their mouth mid-sentence as he threw them downwards. Xilian aimed his arm down, forming ruptures of space around himself. Each rupture fired a beam of condensed energy which went straight for Chashkal. 

Chashkal spun around, forming their scythe to spin it around, which redirected each beam to a random direction. The beams however, were homing in on Chashkal, impacting them from the sides. They screamed out in pain "N-Not this time, this wont go the same way like with the piece of scrap!". Chashkal was too distracted to notice that the Chaos golem had already had its arm in the air. The golem struck down with such impact that it completely knocked Chashkal out.

Xilian landed with a violent thump, his body melting the very ground beneath him to molten magma. He came closer to them, his body starting to rapidly crisp up their skin. The shock in pain woke up Chashkal, but Xilian wrapped his palm around their mouth tightly, muffling their screams as all Chashkal could see was Xilian's ragged up face. The bottom eyes of Chaskal began to melt out as all the muscle which kept the face together started snapping and tearing. They began gurgling in their own blood as they could not breathe.

Xilian then tore his fingers straight through their skull, ripping the very bone in half and completely melting the brain matter. He stood up, consuming Chashkal's very essence of what made them, getting the fraction of chaos they stole back. He turned to the incomplete Chaos golem, ripping open a rift to fit his size. The golem walked into the rift and as he closed it, he looked at his surroundings. The mountainside was gone, the luscious landscape now burned a cinder and the news outlets in the world went crazy.