The idea of finally reaching this fight scene... it fills you with determination. Thanks for the support, all!
A few hours later, the underground was lifeless and still, and the skeleton in question stood alone in the judgment hall that he had so many times stood in before.
He really, really hated this part.
Of all the possible outcomes of his lifetime, the many different options of this world, throughout each reset, nothing seemed to tear him apart more than when he stood here, his eye sockets sporting a dim white glow as his pupils got smaller in anticipation, and his heart began to race.
Sweat began forming on his skull as he heard those all-too familiar pattering steps making their way through the ancient building, towards the throne room. Towards the place where Asgore would normally reside. Towards him. He felt a rage beginning to build up inside of him. Somehow, it was different this time around. He began to feel calm. Determined. The sweat began to dissipate. He was ready.
This ended, now.
The human stepped into the light, red ribbon shining, and knife in hand, it's sharp blade gleaming against the sunlight filtering into the hall. The minute they saw Sans, they smiled.
To their surprise however, Sans smiled right back.
"Where?" they signed, before making a throat cutting motion with their hand. Sans stuffed his hands in his pockets, and shrugged.
"I wouldn't worry too much about that, kid… this one's between you and me. Much to your displeasure, it's gonna be the last one, too."
"Dont be so sure..." they signed right back, a sick chuckle bubbling up from their throat. Sans watched them calmly, and stood taller, snapping his fingers as his right eye began to glow, and his gaster blasters stood at the ready.
"Then let's go, dirty brother killer..."
Undyne had her hands on either side of Alphys's desk, gripping the wood so hard it was beginning to splinter.
"T-This is crazy!" Alphys cried. "What are is s-stats? Does anyone know?"
"LOW…." Papyrus piped. "TOO LOW…"
"How low are we speaking?" Asgore inquired. "Perhaps he has a fighting chance yet"
"HE ALMOST DIED WHEN HE ACCIDENTALLY FELL DOWN A FLIGHT OF STAIRS IN OUR HOME." Papryus cried helplessly, and Undyne screamed in anger.
"This aint good…" she muttered, watching the screen intently.
The battle had officially begun. The human screamed in frustration as Sans dodged attack after attack. He stood back as the human was engulfed in blue, and sent flying across the judgment hall, before they were thrown into a pillar with a sickening crack.
"I can't understand for the life of me why you do this, buddy…" he said with hatred. "You aren't going to win. We're gonna stand here forever… no matter what happens…"
The human began laughing again, their knife held high as they charged him. Sans made a hasty dodge, which resulted in his hoodie getting torn, but luckily, not him. He gasped in surprise, his eye sockets growing wider in worry as the red-eyed demon smirked at their sudden progress. Damn. They were getting better… and the fight hadn't even lasted that long.
"I'll give ya that one, pal…." He said with a huff, suddenly teleporting behind them, and sending a blue bone straight into their back as they screamed in pain. "But don't get used to it…."
The human sped away from him, trying to catch their breath, but Sans wasn't going to show mercy this time around. A gaster blaster let out a sudden explosion of energy, and they got knocked back even further, their HP getting lower, and lower.
"Not yet..." The evil human signed with a twisted grin, and as Sans hit them for the last time, their soul shattered, and they collapsed to the ground. He heaved a sigh of relief, but knew this was far from over. He had quickly found out through his further research long ago that they had to power to LOAD, and Sans knew that if he didn't destroy them for the last time soon, he would be in real big trouble.
Sure enough, from just outside the judgment hall, a loud and evil laughter was heard. Undyne and the others were still screaming about what they were minutes ago, unaware of the current set back in the timeline. Sans however, knew all about this. This was going to take everything he had. Though he was certain before the fight started that this was going to be it… now? He wasn't so sure.
"Hopeless..." The kid signed once more as they came into view, knife resting heavily in their hand, and a smile on their face. Sans felt more determined than he had in years, and returned that same smile again as his magic came to life.
"That all you got?" They charged forward, knife at the ready, and he grabbed them at once with his blue energy, throwing them with such force, he was surprised their HP wasn't down to nothing already. "I could do this all day…"
The human began to laugh, quickly maneuvering until they were right beside him. Sans dodged one swipe, flipped away from another, and slid far from the last. They let out a scream of frustration as their knife missed it's target, and collided with a pillar, a piece chipping off. They turned around, looking at the knife before turning their hateful gaze back to him.
He wondered what the purpose of all this was. The monster was just going to RESET again, so why were they putting so much into this fight? did they really like toying with everyone that much? He gasped as the human's blade missed his skull by inches, and he slid under the approaching blade, skidding sloppily across the floor before teleporting to safety. That was close. Too close.
He had to focus. He couldn't afford to give up yet. He teleported to a higher ledge in the hall, sending his gaster blasters down to try to stop the threat. The human let out another cackle, destroying all four effortlessly, and grabbing a hold of Sans's ankle, trying to sink their knife into his leg. He snarled, using his height to his advantage, and throwing himself onto the human. They went tumbling down toward the ground below, and Sans made sure they landed below him with a loud crack. He fell away from their lifeless body, breathing heavily, his eye blazing, and fear in his stare. The unmistakable sound of their soul shattering was soon accompanied by the golden light of a LOAD, and the same menacing footsteps outside the hall were bound to drive him mad.
The cycle continued. The fight kept going, and going, and going. Hours upon hours for Sans had passed, but with each LOAD, he noticed the human had been getting more and more frustrated. They were downright ruthless the next few times around, not even bothering to sign anymore threats, simply speeding across the hall toward the smaller skeleton with LV in their eyes, and a soul out for downright murder.
Sans knew he couldn't keep this up much longer either, though. He was tired, oh so tired, and if the fate of his brother and all he loved wasn't resting on his back right now, he'd be more than content to snooze, and head on over to Grillby's once the human had taken his life. He breathed heavily; sweat forming on his skull as they readied their next attack.
"Come on, kid…" he smirked, even though he was swaying. "Let's get this over with…" They smiled with something that wasn't a normal equivalent to joy at all, and Sans knew exactly what they were going for next.