Sans left [Y/N] with Papyrus and Aliza as he trudged through the snow and to the center of town. Sans used to dream of him too before the C.O.R.E malfunctioned and after Gaster fell. He was pretty damn certain they weren't dreams, which meant Undyne really was coming for his mate and baby. Sans was going to do exactly what his dad suggested. Sans put a finger and thumb to his teeth and whistled, waiting for the monsters of Snowdin to crawl out of the darkness and back into the light. It didn't take long at all, the dogs came running, snarling, and snapping at each other, rabbits, bears, and other creatures that Sans didn't question. "Grrrrr, what do you want, Sans, rrrrrrr." Someone asked. "the child of snowdin has returned and repaired the c.o.r.e." A murmur rose immediately. "the queen wants our savior dead though." Sans quickly cut in before it got too loud. Sans lugged his axe onto his shoulder. "she wants all the credit, so she's coming to kill the child of snowdin. i don't know about you, but i won't stand for it." Growls and outrage exploded through the crowd and Sans lifted his axe. "i say down with the queen!"
"DOWN WITH THE QUEEN!!!" Snowdin cheered.

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With the entirety of Snowdin now informed and preparing for what they very well knew could be their last fight, Sans went to inform Papyrus and yourself of his plans. "WELCOME HOME BROTHER, WHAT DID YOU HAVE TO DO?" The three had looked like they were in the middle of a conversation. "sugar had a warning from dad, we're taking down undick once and for all." You stood quickly from your position on the couch. "Then I'll fight with you!" Sans shook his head quickly. "nu-uh. you need your magic for the baby, besides, you're the target. i can't afford to put you in harms way again. not with so much at stake." Papyrus stood up. "SANS IS RIGHT. YOU MUST STAY HERE AND WATCH THE LITTLE HUMAN." He looked down at you. "we'll be ok, sugar. it won't just be us. everyone in snowdin is fighting, plus she's gotta go through the temmies first. she'll be weakened by the time she gets to the fog." That admittedly did make you feel better. "Fine... just be careful, ok?" They both nodded, smiling.

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Undyne ripped the last Temmie off her back, loosing for flesh and scales as she did so. The creature was quickly turned to dust after. Undyne had no patience for anything that stood between her and her goal. The human. Would. Die. She was DETERMINED to kill it and Sans no matter how much she was attack and no matter how much she bled. She continued forward without much care as to anything else, the Queen had lost her Justice long ago. The crystals of Waterfall started to glow dimly, the magic stored within them restoring ever so slowly. Undyne ignored the dust around her, kicking it up as she trudged through them. She could see, finally, her goal. The fogbank that signified that Snowdin was before her. She expected a fight from Sans and Papyrus. They cared about the damn girl after all. She could feed her to the rest, since that's what Sans had convinced them to do and the soul could go with her to break the Barrier. She thought her plan was flawless, but she had no idea h o w w r o n g s h e w a s .

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Her first three steps inside were met with disaster. Teeth tore flesh and it darted away before she could grab it. She summoned a spear, weak, she should've eaten before she left. Still, it was effective, as soon as fur collided with her again, she stabbed it. The canine turned to dust on top of her. A series of howls rose up, surrounding her. The Canine Unit. She realized. Sans had them on his side. She found herself being attacked on all sides. She threw up a multitude of spears quickly. There was some yelps, but her weakened spears broke quickly. She didn't know if she killed any of them. Undyne was wasting time, she had to kill the human, these mutts were insignificant. They continued after her, slowing her down as she tried to turn their souls green or run them through. Ultimately though, she continued forward, eventually breaking through the fog. They all attacked before she could comprehend it, fire, teeth, claws, bones, and attacks from all manner of monsters struck her over and over and over. It wasn't a battle, it was a massacre. One vs an entire town.

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A lone red eye stared through the fog as the once glorious fish woman tried to stand. She was already torn up before the town attacked, the Temmies had done a number on her. Bites and scratches and littered her legs, back, and shoulders. Then the dogs sneak attacks only proved to further irritate Undyne's wounds along with creating more. Papyrus had lead the main force waiting outside of the fogbank. Sans would've if he'd had the magic too, but he didn't. So he'd been left to the final task. Fitting for a Judge, really. Tap tap tap tap. Tap tap tap tap. Sans noticed her freeze and tense as his phalanges tapped against the handle of his axe. Sans approached slowly, a predator who knew that his prey couldn't fight back. A sadistic grin was in place. "how pathetic. i thought you'd put up more of a fight." Undyne glowered at him. "I'm not done, sadistic bastard! I'll kill h-" With a thump, her decapitated head hit the snow and melted, as did the rest of her body. Sans huffed, pausing to look up as he noticed the snow fall gently around him.