Hey, everybody! I can't believe how much this story has been viewed, favorited, followed, and reviewed. I'm kinda in shock at the 2,300 views. This is the last battle One-Shot I plan on doing, and any following ones will probably be about something different. Just a heads up.

Also, before we start, shout-out to Ponythekidrs and Eric566 for an awesome job of beta-ing. You two rock! Now without further ado...

Description: As Sans pondered what to do with the kid who was murdering everyone he knew, everyone he cared about, he was approached by Asgore. Sans was shocked at what Asgore asked of him. How will this affect the final battle of monsters and humanity?

Sans looked at Asgore, bewilderment on his face.

"you want me to absorb the souls of the humans?" Asgore nodded.

"Yes. I feel that you would be better accustomed to them. After all, you have mastery over two. I can only use one." Sans nodded.

"yeah, yeah, but i-"

"We both know you're going to stay here. The human is coming this way, and you volunteered to destroy it. To be quite honest, you're our last line of defense. The way… the way Undyne fought was beyond what I could do. You seemed to think you could do better, however." Sans opened his mouth to protest, but Asgore raised his hand to silence him.

"Don't deny it. I saw how you watched the battle. You'll do better than her, Sans, and you know it. So you deserve this far more than I do."

"king asgore, don't you think you'll need the souls to protect you?" Asgore laughed.

"Sans, if you have them, you'll protect me more than I ever could." Sans looked down.

"are you sure?" Asgore nodded.

"fine. i'll absorb them." Asgore gave a grim smile and they walked down to the basement where the SOULs resided.

OoOoO

Sans felt like he would die. The burning sensation of six human SOULs was killing him. Then… he felt nothing. He looked up at Asgore, who was looking at him worriedly, and gave him a bright smile. Then a horrible pain arose in his head, along with shards of memories that Sans was sure he couldn't have had. Why was he friends with the kid? Why was the kid friends with everyone else? Why was Papyrus alive? And then he realized.

He was viewing every one of the kid's RESETs. He saw what he would do if he passed Sans. Sans let his smile drop for the first time in his life. Then he fainted.

When he arose, he saw Asgore looking over him, clearly worried. He got up, and strangely enough, he felt… fine. He could still remember everything, but the pain in his head had ceased.

"Sans! Are you alright?" Sans nodded.

"yeah, i'm fine. Where's the kid?" Asgore looked grim.

"He's at the old house. He should be arriving at the final hall at any moment." Sans nodded.

"then i'll just show him what it means to… actually, i've already said that enough." Sans disappeared from the basement.

And reappeared at the Hall of Judgement. He saw the kid across from him, staring at him with hungry, evil eyes.

"frisk." The kid's eyes widened minutely.

"i know what you've done. i know about the resets. and you know what? all that you've done, every friend, every death, it's all led to this. this final showdown. i know you've killed me. multiple times. but, something happened. you changed reality with your actions. papyrus. chara. you've made everything better after you defeated him, and you still want more. you're not chara. he hated existence. you just kill monsters because you can. because it occupies you. and that makes you worse. you know, during the time you were content with making friends, i told you something. i told you that if i hadn't promised to help you, you would be dead where you stood. I think it's time to make good on that promise. Don't you?"

Black. A single red heart, no sound, barriers enclosed. Frisk looked around for Sans. His eyes spotted the skeleton, standing there.

"now, this would be where i would open up with my blue attack, some gaster blasters, and a phrase that i believe to be true. you know what that phrase is? kids like you… Should be burning in hell." Sans gave a bone-chilling smile. His arm swing down, and Frisk's now blue heart came down with it.

Frisk was about to jump when he saw Gaster Blasters come at the corners of the barriers. He jumped to the side in order to dodge them, and he smiled as the bones came up and the Blasters came up at the same time. This would occupy him amazingly. Good.

Frisk's heart turned to red, and he had to move quickly as a wave of bones came from the right, leaving only a small path to navigate. He had just dodged all of the bones when another barrage came from the top, with the same narrow path present. He dodged all of those, and two paths came from the bottom and left. He just managed to travel the path that was formed by these two bone waves colliding.

As the bones left the field, Gaster Blasters came in at the corners and at the middle of the left and right side. Frisk moved up and just managed to reach a safe area as the Blasters fired, covering everything but the top and bottom in white lasers. As the Blasters moved away, Blasters appeared at the middle of all four barriers, and just as the first four lasers were fading, eight Blasters appeared at the ends of all four barriers. Frisk just managed to move out of the lasers' path as they fired.

When the Blasters left, Sans threw his arm down again, and Frisk jumped in the center of the square confinement. All around him, bones extended to the point of him feeling cramped as they closed in around him. As the bones retreated, Frisk heard Sans sigh.

"welp, i guess i should've expected that. After all, your reflexes are the best in the world, aren't they?" Frisk gave a feral grin and nodded.

(Megalovania Dual Mix – Iwannabethecollector)

The true final battle has begun.

As Frisk was going to fight, he noticed bones propping up and moving around him. He smirked. If Sans was bringing the non-attack bones out right away, this would be fun. He swung at Sans, who jumped out of the way and shrugged.

"you and i both know that doesn't work. but it can't hurt to try, i guess." Sans' arm swung down.

Frisk was enclosed in a tower of bone, with platforms leading up. At his sides, walls of bone were closing in. Frisk jumped from platform to platform, some jumps bringing him in close proximity to the ever closing walls. As he reached the top, a very small gap appeared in the bone wall across from the platform. As the walls were about to touch him, Frisk jumped through the gap and escaped the death trap.

Sans is smiling smugly.

Frisk swiped at Sans, hoping for him to dodge. Sans snickered and jumped out of the way.

"ya know, this is your only attack, isn't it? well, you'll have to do better than that. 'cause guess what? with these souls, i have control over every soul mode there is. so… let's try them out, shall we?" Sans right eye flashed green, and the barriers shrunk and formed an octagon of white. A bone formed in Frisk's hand, and he had to defend against bones hurtling at him from all directions. Bones came from up, down, left, right, up-left, down-left, right, left, and the pattern went on and on. Just as the bones stopped hurtling at Frisk, the barrier extended to its normal shape but kept its small size. Sans' arm shot to the left, and Frisk had to suppress all of his reflexes as he saw the bones enclose his SOUL, making any jump deadly. Just as the bones above him started to retreat, Frisk jumped to avoid the bones that rose from the barrier below him.

You feel your sins settle in your mind.

Frisk grinned and threw his knife at Sans, who just dodged and shook his head as Frisk's knife hit the floor next to him. He barely saw Frisk move as he ran towards him and grabbed the knife. Frisk swung again, but to no avail.

"i guess that's a valid strategy. you don't seem to tire at all, and i'm not sure if this energy is limitless. the only problem with your strategy is that if you get hit enough, you'll die. and then that strategy is kaput. but first you'll have to die."

Sans' right eye flashed light blue, and Frisk's heart turned that color as well. Frisk stood as still as he could, as bones whizzed by him, going straight through him. Sans' right eye flashed orange, and Frisk did not stop moving as Blasters filled the entire area with lasers. Sans' eye changed to blue for a second, then orange for a few moments, then blue for a while, and orange for a second. As the bones came, Frisk's heart turned light blue, and he stood still. Then without warning, Frisk's heart turned orange, and he barely managed to get moving as the bones continued to come at him. Frisk's heart turned light blue again, and he was hit by a bone as he tried to stop. Frisk's heart turned orange, and he moved as the bones continued to come. As the attack ended, he realized the heart's colors were synchronized with Sans' eye.

You feel like you're going to have… well, you know.

Frisk swung at Sans, who jumped out of the way. Sans gave a smug grin.

"so, how'd you like that last attack? i promise you, you'll like this one more." Sans' right eye flashed purple, and Frisk's heart followed suit, being strung along a string of bones. A wave of bones came from the left, and Frisk had to jump between the strings as one path ended and another began above him. He kept doing this, sometimes jumping between two strings at once, when another wave of bones, albeit sparsely spaced, started to come from the top and bottom. Frisk barely managed to move between the strings while also dodging the bones coming from above. After a while, attack ended, and Frisk's heart returned to red.

You feel the SOULs' will to defeat you.

Frisk swiped at Sans, who dodged. Sans sighed and shook his head.

"kid, i understand why you're doing this. but it's still wrong. murdering everyone… in what world do you think that's right? do you even care about what's right anymore?" Sans' right eye flashed yellow, and Frisk's heart turned upside down, now the color yellow. Bones came flying down, and Frisk had to blast through sections of each bone by shooting it multiple times. The bones came again, but they were moving across the screen, and some bones were almost about to hit Frisk when he destroyed the section in front of him.

Sans seems like he's pondering something.

When Frisk swung his knife at Sans, Sans jumped aside and scratched his chin.

"this probably won't end anytime soon. so, let's make your time even worse." Sans' right eye flashed green, and Sans' left eye flashed orange. Frisk's heart turned into those colors, the right of the heart green, and the left of the heart orange.

"i wonder how that works. well, that's for you to figure out, isn't it?" The barrier shrunk to a small octagon, and Frisk found himself with a bone in his hand. Bones started to fly at him from all eight directions, and as he braced the bone in his hand for impact, Sans' bone crashed into his with a jarring force that made his arms hurt. He swung at the next bone, worrying that he was too late, only to find as he hit the bone, the bone flew away and he felt no impact. Frisk kept swatting at the bones just as they came close, and there was a lull.

Then Sans' left eye flashed blue, the orange part on Frisk's heart changed blue, and seven bones came at him at once. Frisk panicked, but as the bones drew close, his face lit up in understanding. Frisk aimed his bone away from all of the bones coming at him, and grinned when he saw the bones pass through him like they did not exist. Sans' left eye flashed orange again, and Frisk swatted at the bones, which were steadily speeding up. After a while, Sans' left eye flashed blue again, and Frisk avoided the bones like he had before. After what seemed to be a long time, the attack ended.

You feel excited for Sans' next attack.

Frisk smirked and swung at Sans, who dodged.

"so, after this, will you stop? if I lose, will you stop doing this? or will you keep devouring timelines until… until everything ends? when you're the only one left? will you be satisfied then?" Sans' right eye flashed yellow and his left eye flashed purple, and Frisk's heart was turned upside down and set along a string of bones. Small, spinning bones rushed at him from the left and right, and he had to move up and down to avoid the bones while shooting at the bones coming from above. As he moved up and down, the spinning bones started to loop back to the direction they came from, and Frisk had to manage that on top of all of the madness that Sans had caused. As the bones on top drew closer, Frisk began to shoot more and more frantically. With a sigh of relief as he passed through the bones, the attack drew to a close.

Sans is giving you a bone-chilling smile.

Frisk dodged the non-battle bones and ate some steak he had bought earlier. He felt his wounds healing, and Sans rolled his eyes.

"so why do you get to be the only one who can heal mid-battle? i mean, can't we eat too? Well, it's too late for me to do anything now." Sans' arm shot to the right, and a sea of bones crashed around on the right barrier. Platforms came from the bottom, providing the only safety from the right barrier, which was now covered in bones. Frisk had to be especially careful not to fall off as his perception was skewered due to the change in gravity. As he kept jumping, all four barriers became awash in bones, and Sans' look became something akin to that of a predator's. Platforms started to float above all four sides of bone, and Frisk's eyes widened. Sans' arm swung up, and Frisk's heart was thrown to the top barrier. Frisk carefully jumped from platform to platform, and he almost fell off of one. As he was in mid-jump, San's arm shot to the left, and Frisk had to realign himself before he plummeted to the sea below, and he landed on the edge of the platform under him. As he jumped, Sans' arm shot down, and Frisk returned to a normal gravitational pull. Frisk easily jumped the remaining platforms, and the attack ended.

Sans is looking angry.

Frisk swung at Sans, who jumped out of the way.

"you know, i've said this before, but i don't think you'll ever be happy. you'll just keep devouring this world, until there's nothing left at all. even if we resist, we'll just be extending your playtime with us. but i know everything you've done, and i can assume the that this little fight is the only thing you've never done. so if i can just present a hard enough challenge to keep beating you, eventually you'll get bored, and the world will finally be rid of you." Sans' left eye flashed a dark blue, while his right flashed green. The barriers morphed until they were small and octagonal, and bones rushed at Frisk with amazing speed. As Frisk blocked the bones, Sans' arm shot to the right, and Frisk's heart rotated to accommodate for the gravity. Frisk, panicked, blocked the bones, some coming dangerously close to him, but he came out unscathed as he kept the bones off of him. Sans' arm swung up, and Frisk prepared himself as the bones continued to rush at him. Just as the bones drew close, Sans' arm shot down and Frisk could not recover in time to block the bone. He managed to block every other, and the attack ended, leaving Frisk slightly irate.

"hey, kid?" Frisk looked up at Sans, who seemed to be sweating.

"i'm actually getting kinda tired. guess this energy isn't unlimited after all. you wouldn't mind lying down your weapon, would ya?" Frisk gave a shark-like grin, and slid the knife along the floor, towards Sans. Frisk approached Sans, as if asking for a hug, all while Sans looked at him with wide eyes. As Frisk came close, Sans grabbed the knife and shoved it into Frisk's stomach. Frisk's eyes widened as he looked down at the knife, clearly not expecting it. Sans chuckled.

"i actually think you did this to me in snowdin. hurts, doesn't it?" Frisk looked at a Sans with a thunderous expression, then gave a grin as he took the knife out of him and slashed it at Sans, tearing open a hole in his stomach. A red substance leaked out, and Sans chuckled.

"i should have expected that, to be honest. well, at least you'll be coming with.." Sans could not speak as he saw Frisk eating a slice of butterscotch pie. Butterscotch pie, the ones that are made by Toriel. Sans felt his insides heat up in pure, undiluted rage as he saw this human using TORIEL to MURDER EVERYONE AND SURVIVE!

Frisk saw Sans' eye turn black, and he watched as the six souls Sans had absorbed float out from him, behind his head. Sans' chuckled as he gripped his chest with one of his hands. Sans' eyes widened, and his eyes glowed, a myriad of colors blending and clashing in his retinas.

"huh… the souls…. they're giving me one last shot… to kill you." Sans grinned.

"better not waste it." Sans' arm swung down, and Frisk jumped in a very precise manner. He almost winced as the bones closed around his position, extremely close to hitting him. Sans' arm swung to the left while his eyes flashed green and dark blue, the barrier turned smaller and octagonal, and Frisk was defending against lightning-fast bones hurtling at him from every direction. As Sans' was swinging his arm to change the gravitational pull, his eyes were turning light blue and orange in bursts. As the bones stopped, the barrier returned to its normal shape and Gaster Blasters lined up around the barrier. They all fired sporadically, and Frisk got hit when he switched from moving to staying still a second too late. Sans' eye flashed yellow and purple, and Frisk was shooting at bones coming down at him at an extremely fast rate while dodging the bones that shot through the strings at the same speed. While Frisk was dodging, Sans' eyes were flashing orange and light blue again, but Frisk could barely concentrate over moving through the the strings and shooting. Sans' eye flashed green, and the barriers moved back to an octagonal shape, with bones coming at Frisk faster than before. As Frisk was defending, half of his heart changed to light blue, and bones came at him, seven at a time. Frisk frantically moved away from the bones and let them pass through him. As a wave of seven bones left, the blue part of Frisk's heart changed to orange and he swung at each of the bones as they were drawing close to him. Sans' eye flashed dark blue, and Frisk was jumping on platforms above a sea of bones. The sea had just covered the entirety of the barriers when Sans swung his arm up, down, left, or right, causing Frisk to constantly readjust himself as he was flying through the air so he could land on a platform. Sans' eye flashed purple, as a barrage of bones came from all sides, making Frisk jump between each line as fast as he could.

Frisk flinched as a bone struck him across the back, but he didn't dare stop. Frisk's heart changed back to red as bones came from all sides, leaving only a tiny path to navigate as they rushed about him. As the last bones left, Gaster Blasters lined up around the box and shot at Frisk's heart. If it weren't for the brief charge-up period, Frisk would have died as he avoided the blasts. The Blasters lined up in a circle, and they fired in a rotational pattern that Frisk remembered from his first fight with a Sans. As he was dodging, Sans' arm shot to the left, and Frisk barely stayed ahead of the laser as it rotated. The Blasters left, and Sans' arm swung down. Frisk jumped , and he could feel the bones brush his body as the entire area, besides where he jumped, had been filled with bone. The bones retracted, and Sans kneeled on the floor, hand clutching his chest. The hearts around his head started to swirl, and a multi-colored protective coating formed around Sans, eventually turning yellow. Frisk stepped forward, and a yellow form lifted off of Sans, morphing until it took a girl's shape. On her was a gun and a cowboy hat. Frisk paused.

"You know, you should stop this. This causes chaos, and the Royal Guards are gone too, because of you! Now, people can do whatever they want, with no regards to the law! Don't you care about justice?" Frisk's answer was a slash of his knife. As the knife hit the girl, she shattered, a sad expression on her face. As the various shards fell to the floor, they steamed and evaporate until there was nothing left. Frisk watched as the coating around a Sans turned to a purple. A purple form swirled around Sans, until a small boy with big glasses and a notebook in hand stepped towards Frisk.

"I won't let you do this. I don't care if you try to kill me, I'll survive. And you'll lose." Frisk could feel the boy's eyes boring into his own, and Frisk smirked before bringing down his knife onto the boy's purple body. The knife clinked off of the body, and Frisk swung again, and again, and again, and again, until a swipe brought a crack to the boy's body. Frisk gave a sharkish smile as he hammed down on the cracked area, and watched as the boy shattered before him. The boy looked surprised, then gave a sad smile.

"I guess… perseverance isn't everything…." The purple bits on the floor boiled and evaporated, and the barrier turned into a light blue color. A form that looked to be a older boy emerged from the barrier, a knife in his hand and a ribbon tied along his arm. The older boy smirked and twirled his knife around.

"You know, before I came down here, I wanted to be a surgeon. When I fell, I was crushed. But I could wait. And wait I did. Now I'm here, and I know that this is almost the end. But I have patience, and not just for my job. I have patience that you'll eventually go back to being Frisk the friend." He was still smiling as he was shattered into pieces by Frisk's knife, and the pieces of the boy bubbled, and after a long time, evaporated. As he turned back to the coating surrounding Sans, a green form walked up to him. The green girl, wearing an apron and carrying a frying pan, smiled.

"I know what you're here for. And I know I can't stop you. But… can't we sit down and talk? Maybe share a couple of stories? I know you have quite a few. Don't worry, you don't have to tell every one of them." As Frisk swung through the girl, he felt a pang in his chest as he was reminded of the way he cut Toriel down. He ignored the feeling, however,when the parts of the girl evaporated and an orange boy with gloves and a bandana strode forth, looking Frisk dead in the eye.

"I'm not scared of you, kid. I'll never be scared of you. And if you want to get to Sans, you'll have to go through me." Frisk swung his knife at the boy's chest, shattering him into many pieces. The boy's face still remained in one piece, however, as the boy stared Frisk dead in the eye. The eyes of the orange boy bored into Frisk's until the face steamed and evaporated. As Frisk looked at Sans, the coating changed to a dark blue as a tall girl, clad in ballet shoes and a tutu, walked up to Frisk.

"You know what you're doing isn't right, Frisk. Even if you have nothing else to do, does it make it right for you to murder everyone? Frisk, I know you've done some bad things, but it doesn't have to be this way. You can start to make the right decisions now, and live a better life. You just need to have some integrity." As Frisk's knife shattered the girl, she gave him one last smile.

"I know you have it in you. Just act on what's right, and you'll do fine." As the girl's pieces evaporated, the coating surrounding Sans disappeared and he gasped. Sans looked at the wound in his chest.

"well, i… guess that's…. it." Sans' body started to disinigrate.

"asgore…. alphys…" Sans' feet were blurring.

"undyne….. toriel…" Sans' chest was blurred.

"p..a..p..y..r..u..s.." Sans' face was blurred.

"i..m..s…o…r….r…" As Sans disintegrated, his last sight was Frisk looking down on him with a sad smile.

So, before you go back to searching for other books to read, I want to say a few things.

1. This collection is mine, but I'll gladly accept ideas to write, and give a shout-out to whoever gave me the idea. Just PM me with the details. I don't want any reviews of the story to be spaced between ideas you guys send me, so please PM. I WILL TAKE DOWN any and all ideas that are posted on the reviews section. Sorry if it's a bit harsh, but I don't want people to be looking at reviews for this story and see a clutter of ideas for other one-shorts. I want them to see only reviews. Can you guys do that for me?

2. PMDF is still alive. I've just been focusing on Undertale a bit more. I'll have a chapter up eventually. I promise.

Alright! See you guys next update!