Thanks again to my friend, Latent Kindly; he's very helpful and will gladly look at any work you want edited.
"Normal speech"
"Thought"
(I recommend starting this music music at sans' second fight when he says Dirty monster killers: youtube dot com/watch?v=sOkoFKOUSjo or if you don't want to slowly type the link in look for: Undertale - Megalovania - heavy metal cover. by MegaShredd, who was kind enough to allow me to link his music)
Sans was sitting on a chair in the new sentry post the guards made. He had woken up early after Papyrus' 'intervention' and had decided to relieve the current guard on duty, who was an almost frozen R2 who had immediately thanked Sans. He was currently trying to stay awake, but failing and he slowly drifted into sleep. He was immediately woken up by a crashing sound, his head snapped up in alarm, and noticed the flower bashing through the door to the Ruins with a large vine. The flower looked up at Sans maniacally, before diving into the snow. Sans backed up, just in time to evade a vine that Flowey had smashed through where his skull was. The flower burst out of the ground and cackled devilishly, before he engaged Sans in battle. Sans was too busy fighting to notice the Demon sneaking behind him through the woods.
Papyrus had woken up to find Sans was gone. Luckily, Papyrus spotted the messy note Sans had left for him, telling him of his decision to relive the current sentry. Papyrus was now walking through the forest towards the post, wishing to continue their conversation, when he spotted an odd figure rushing amidst the trees.
"HALT! THIS AREA IS OFF LIMITS, YOU NEED TO STEP OUT OF THE TREES NOW!" He yelled at the figure, who giggled in response.
"WHAT'S SO FUNNY?!" Papyrus yelled. The figure just giggled again, before rushing towards him. Papyrus immediately recognised the figure.
"NO! NOT YOU! I MUST STOP YOU! FOR SANS! IN THE NAME OF THE KING THE GREAT PAPYRUS ORDERS YOU TO HALT! HALT!" He yelled, sending attacks towards the Demon, who cackled madly and punched through a wall of bones as they continued their charge.
'Why did I have to get up early today? Why?' Sans contemplated, as he dodged another wave of bullets.
He countered with a cluster of Blasters, before teleporting out of the way of a thorned vine. Flowey seemed to be enjoying himself. Sans grimaced, before sending another wave of bones at the flower. All of a sudden, sword magic swung out from behind him and cut apart some of the vines.
Sans smirked as Flowey grew less confident.
"what took you so long?" He said, as the guards swung their weapons at the weed.
"Hey, like, we only just heard the noise bro." R1 said as Sans pulled back for a breather.
Papyrus was sweating, the Demon just went straight through his attacks!
"JUST GIVE UP ALREADY! DO YOU REALLY WANT TO DO THIS?!" He yelled, summoning even more complex bone patterns, the Demon just ignored him.
"STOP! NYAGH! SPECIAL ATTACK TIME!" Papyrus screamed, pooling all his magic into his special attack. He summoned a large Blaster, shocking the Demon for a few moments before they cackled and continued running at him. Papyrus grimaced, before firing the blaster. The Demon was engulfed in a bright light, and Papyrus had to look away for a moment. He turned back just in time to see the Demon busting through the blaster with half HP and some scorch marks. Their face was lit up with sadistic glee and their fist was aimed straight at his sternum.
Flowey dodged another round of sword swings before being smashed into a tree by a close range Blaster. He shook his petals, before grinning at them and disappearing into the ground. The guards stayed alert for a moment, before allowing themselves to relax.
"heh, thanks for the save guys. i'm gonna head home for a nap." Sans said, grinning as he started walking back.
"Like, See you later then bro!" R1 called out after him.
"O-Oh, well then..." Papyrus said, his strength failing him.
He looked down and saw the Demon grinning back up at him, their entire arm was lodged through his sternum.
"E-Even that attack... W-What are you?" He gasped, falling to his knees.
The Demon simply cackled as they placed their foot on his rib cage, roughly pushing him to the ground and pulled their fist out of his sternum. Splinters of bone and dust covered their glove. The Demon looked at the mess, before laughing and shaking it off of their hand.
"S-Sans... Brother... I love you..." Papyrus choked out as his body turned to dust.
The Demon embraced the addictive rise in LV, before giggling and skipping away.
Sans noticed something fluttering in the wind ahead. Something red. His soul almost fractured as his max HP lowered to 5.
"no...no No No NO NO! PLEASE GOD NO! NO! NOT NOW!" He started screaming, as he ran up to the pile of dust and grasped the scarf. His HP dropped down to 1 when he truly realised what had happened
"PAPYRUS! NOOOOOOOO! NOT AGAIN!" He shrieked, falling to his knees and hugging the red scarf tightly to his chest, crying loudly.
"Pap... Please... Come back... Don't leave me like this... Please... I don't want you to die... I only just got to tell you..." He cried, rocking back and forth.
Undyne found him in that exact same position at least 2 hours later. He was still crying.
Chara snuck behind another sentry, before cutting their head off with a pair of ice skates. They giggled insanely before shaking the dust off of their murder weapons. They had killed all of the few guards and monsters they saw on their way into Hotland. The bulk of the guard was in Snowdin, drawn out by Flowey, and the monsters were hiding. Chara did not mind the lack of monsters to kill. They had a better plan. And their host agreed
Alphys woke up at her desk as small alarm went off on her computer. The DT Extractor was being activated! She ran down to the true lab just in time to see the Demon using a somewhat modified DT Extractor on themselves. A pitch black soul was pulled out of the Human's chest, and into the DT Extractor. Alphys ran over to the human just as they woke up. They looked at Alphys, crying as they ran towards her and Alphys braced for an attack. She was not expecting the hug she received from the crying human...
Nor was she expecting the cold and painful knife plunging deep into her gut. Alphys gasped silently and her eyes went wide. The human called Frisk pushed her roughly off of the knife onto the cold floor. Their brown, teary eyes glinting madly as they began cackling. The last thing Alphys saw was Frisk turning back to the machine, cleaning the blade carefully before sticking it back in their pocket. Then everything turned white. There was a new member for the crusade.
Sans walked up to the barrier, red scarf in his hands and face drenched with tears.
"You will pay for this Demon... I shall show you the true meaning of the word suffering... For Paps." He vowed, as he shot his hand into the air.
The soul containers rose up out of the ground and the souls rushed into his body. He groaned and dropped to his knees as the souls started changing him.
A strange door slowly took form in the depths of Waterfall. It stayed there for a moment before it was opened cautiously from the inside. A tall, lanky skeleton in a lab coat inched his way out cautiously. When he realised there was no danger, he walked over and looked into the nearby river, taking stock of his current form. A wide grin split his face as he adjusted his tattered lab coat with his holed hands. He had a reality to stabilise.
"Hey, Alph? You here nerd!? We need to evac!" Undyne yelled. She noticed a door open, and went through.
A short elevator ride later and she was stepping through the true lab.
"HEY NERD!" She yelled. Only to gasp as she stepped on a dusty lab coat.
"NO! NO! I'LL KILL YOU DEMON!" She screamed.
"Then try it Fishy!" The Demon giggled as they stepped out towards Undyne. Tossing away an empty DT syringe. Their entire body looked shaded and gooey. They were made out of Determination.
"NGHAAAAAAA!" Undyne screamed as she ran towards the Demon, only to have it dodge out of the way and cut her leg off.
"AUUUUGH!" She screamed, before her determination kicked in. She slowly stood up as a goopy leg reformed.
"Y-You're gonna have to try better than that!" Undyne spat, before throwing a barrage of spears at the Demon managing to slice their HP down to dangerous levels. Her barrage was soon cut off as a knife was slipped into the back of her neck. The Human giggled before pushing her to the ground.
"N-No... Not again... NO! I CAN'T LOSE! NOT YET!" Undyne yelled as she colapesd to the floor and started melting. In front of Frisk.
"Alphys... I... I'm sorry..." she whispered, before she turned into a pile of goo.
The two psychopaths giggled together, before joining hands and skipping off to find a new victim.
A few hours later and they were at the entrance to the Judgment Hall, caked from head to toe in dust and joined by a scared yet determined Flowey and the souls of three monsters; Papyrus, Undyne, and Toriel.
"You got my back partners?" Chara asked.
"Y-Yeah, sure thing Chara!" Flowey stuttered.
Upon receiving a nod from Frisk, they walked into the hall.
The hall was pitch black. The windows were covered with drapes and a large form was blocking the light from the end of the hallway. The group of homiciders walked to the middle of the hall, with the spirits trailing behind. Chara needed no light, they were tracing the steps etched deep in their memory.
"This is different" Chara said.
"HEYA..." A booming voice rang out through the hall, disturbing their thoughts. The voice was dark and menacing, filled with malice and yet an undertone of smugness.
The one word alone would make an average person evacuate their bowels and a weak person have a heart attack.
"W-What was that?" Toriel whispered. She was terrified, and she was already dead
"YOU'VE BEEN BUSY, HAVEN'T YOU? HEH HEH HEH. I HOPE YOU PSYCHOPATHS ENJOYED YOUR MURDER SPREE WHILE IT LASTED. 'CAUSE KARMA IS ALWAYS DELIVERED IN THE END. HEH HEH HEH."
A massive shadow shifted at the end of the hall, with a shape that seemed to better fit in a mental patient's worst nightmares. Two bright rainbow coloured eyes shone as the voice turned even more menacing.
"G.U.E.S.S..W.H.O..G.E.T.S..T.O..B.E..T.H.E..M.A.I.L.M.A.N.. HEH HEH HEH."
All of a sudden, the windows burst open with such a force that they shattered and the drapes were thrown onto the floor, the light revealing a truly nightmarish monster.
A gigantic bone creature filled the corridor. He was so massive he had to hunch over on his knees to fit in the hall. His entire body was covered in wicked looking spikes like a cactus. The spikes dripped a purple poison, which was presumably Karmic Retribution. On his back, two massive, bird-like wings swept down from his back like a cloak, each coloured like a rainbow and they shone brightly with reflected sunlight. A long, barbed tail swept from his tailbone, twitching two and fro in anticipation. Large spikes were protruding from his elbows and knees. Thick, spiky bone plates were covering his arms, legs, neck, and tail like armour. His hands and feet were clawed, sharp enough to cleanly cut concrete judging by the gashes his claws left on the pillars and floor. Two smaller arms were mounted below his main arms. His head was shaped like a Blaster, with longer, sharper fangs, and long bone horns sweeping out from his forehead and back from the angle in his jaw bone. Papyrus' red scarf was tied delicately around his left forehead horn. Two large reptilian eyes blazed with an amalgamation of colour in the eye sockets, burning holes deep into the maniac's souls. A halo of 6 large Blasters circled his head, each shining a different soul colour and all facing outwards. Tatters of his hoodie were stretched on his large, armoured ribcage. inside the ribcage, a disc of powerful magic encased seven souls, the six souls were arranged hexagonally around a large monster soul, and streams of coloured magic were being leached from, no... Being given by the human souls to the monster soul.
Flowey was the first one to speak.
"S-Sans?!" he stuttered
"S-Smiley trashbag... really changed." Chara chuckled nervously.
"Wait... THAT'S SANS!" Undyne yelled.
"Oh my..." Toriel gasped.
"HEH, YOU LIKE THE NEW LOOK? THIS IS WHAT HAPPENS WHEN YOU CAN WORK TOGETHER WITH HUMAN SOULS. WE DECIDED TO STOP YOU FROM DESTROYING THE WORLD THIS TIME. BUT THAT'S BESIDE THE POINT. NOW, IT IS TIME TO PASS MY JUDGEMENT. HEH HEH HEH. SORRY LADY, BUT IT'S TIME TO BREAK ANOTHER PROMISE. WELP, HERE IT COMES... DIRTY MONSTER KILLERS!"
The battle engaged. Naturally, Sans started, lifting up his huge clawed foot, before he brought it crashing down onto the ground. Reality around them cracked, before shattering like glass, leaving them in the void. Sans was able to stretch up to his full height, towering above the killers like a building. His wings spread open,wingspan comparable to a commercial jet His Blaster halo split off and fired off some blasts before circling around his maw. He took a deep breath and gathered magical energy in his mouth while the Blasters did the same. His eyes blazed like rainbow wildfire as his jaw split open to reveal a large ball of white energy, which he released in one huge blast. The circling Blasters used their coloured blasts to focus the magic into a pure, compact ball of rainbow magic, before Sans sent it shooting towards the maniacs at the speed of sound. They barely dodged in time before the small ball hit where Frisk was standing. The ball instantly exploded into a massive blast of energy that sent the killers flying. Sans looked somewhat astonished, before a crocodile like grin spread onto his maw.
"HEH HEH HEH, I LIKE THIS. DO YOU? HEH HEH." Sans chuckled, a deep rumbling laugh.
"THAT WAS AWESOME!" Undyne cheered.
"I BELIEVE IN YOU BROTHER SANS! I ALWAYS WILL." Papyrus yelled.
"You can do it, Sans." Toriel said.
"NO I DON'T LIKE IT!" Chara yelled at the taunting monster, before getting up and sprinting at Sans, only to be swept away by his tail.
Chara screamed in pain as the barbs pierced their skin and Karmic Retribution bled in.
Flowey rushed over to Chara before healing them.
Frisk checked the towering monster.
THE MERCILESS JUDGE, EPILOGUE SANS
AT: ABSOLUTE DEF: ABSOLUTE
The weakest monster in the underground just got a big boost.
Weaknesses: "HEH, NOT A CHANCE IN HELL 'BUDDY'"
Run while you can. Mercy is off the table now.
You cannot win this fight. He is only toying with you.
"YOU SHOULD HAVE LEFT US IN PEACE AFTER WE GOT TO THE SURFACE. BUT YOU JUST HAD TO KEEP GOING DIDN'T YOU? I WANTED TO BE FRIENDS, HECK, YOU WERE LIKE FAMILY TO ME. HEH HEH HEH. GUESS YOU DON'T LIKE FAMILY HUH? HEH HEH HEH."
Sans chuckled mirthlessly, before slamming his claws onto the 'ground'.
Their souls turned blue as they were slammed down, and huge forests of bones shot out of the 'floor' at the psychopaths, requiring them to dodge quickly and accurately. They were forced to run for their lives when Sans swiped his tail across a massive group of bones, causing a huge wave of bones to wash over them. A thoughtful expression crossed his face before he grinned and crouched down. His wings rose above him, before they slammed downwards, propelling him into the air. The maniacs tried to run as soon as they realised what was happening. Sans slammed back down onto the 'ground' with his claws, causing a massive shockwave of bones to smash outward from him. The killers were pelted with bones until their health was less than half.
Flowey tried to hold Sans still with vines so Chara could attack him. Sans simply shrugged and the vines burst. He slammed a clawed fist down at a charging Chara, who was forced to dodge. Frisk healed.
"KEEP GOING SANS! DON'T GIVE UP!" Undyne yelled
"I JUST WANTED A HAPPY ENDING. IT NEVER HAD TO COME TO THIS. HEH HEH HEH. DO YOU REMEMBER THOSE TIMES? PAP WAS A GREAT CHEF, UNDYNE AND ALPHYS WERE MARRIED HAPPILY, THE KING AND QUEEN FORGAVE EACH OTHER AND TOOK YOU IN AS THEIR OWN... YOU WERE HAPPY, RIGHT? HEH HEH HEH. WHAT AM I SAYING. SOMETHING LIKE YOU COULD NEVER BE HAPPY."
The Blaster halo circled around his maw again as he sent waves of bones against the maniacs. Instead of letting all his energy out in one blast, he let it out in a beam. The Blasters used their beams to concentrate it into a powerful rainbow beam that Sans used to almost cleave Chara in half and cut through a forest of vines Flowey had summoned.
Flowey healed his partners as they went in for a team attack. They charged at Sans' legs, only to have him use his wings to pull off a seemingly impossible backflip, before a wall of bones blocked them off from him.
The souls of the humans and the monster spectators yelled encouragements at Sans, who grinned wider.
"YOU KNOW... I KINDA WISH I'D HAVE DONE THIS SOONER. BUT... POWER CORRUPTS..Y.O.U..S.H.O.U.L.D..K.N.O.W."
Sans threw the bone wall forwards as he charged at the killers, talons scraping against the ground. He was very close to them when he attacked. His talons swung up, carving huge trails of magic into the air, before he slammed his claws back down. The trails shot forward, slicing clean through Flowey's defensive vines and through him, his HP was immediately depleted as one large slash cut him clean in two. His eyes widened in shock and a strangled noise left his mouth, before he melted.
"HEH, ONE WEED WACKED. HEH HEH HEH."
"YEAH! ONE DOWN SANS!" Undyne yelled.
"I... I WILL STILL LOVE YOU SANS. EVEN IF YOU KILL THEM. I WILL ALWAYS LOVE YOU!" Papyrus screamed.
Toriel looked away before sighing.
"It... Had to be done. I forgive you Sans." She said.
"FLOWEY! NO!" Frisk yelled, running over to his puddle. Sans looked surprised.
"SO YOU DO CARE ABOUT OTHERS... HEH HEH HEH, YEAH RIGHT! THINGS LIKE YOU HAVE NO FEELINGS!" Sans sneered, as he moved back to his position.
Chara yelled in rage, before running straight at him. Sans smirked deviously as she got closer, before using blue magic to push them onto their back right before she swung her knife. As he held them their with blue magic, he simply reared up and slammed his clawed foot down hard on the screaming Demon. He chuckled deviously, before scraping his bloody foot on the 'ground' like he had just squashed a bug.
Despite having a tough stomach, even Undyne vomited along with Toriel. Papyrus, due to not having a stomach, simply winced.
"TWO DOWN. ONE TO GO. YOU GONNA GO QUIETLY, OR DO I HAVE TO DRAG YOU TO YOUR DEATH KICKING AND SCREAMING?"
Frisk looked scared for a moment before they yelled and ran at him, swinging at his leg. Sans reeled back and kicked them away as he summoned a bone column. He grinned wider as their body hit the column with a sickening crack before they fell to the 'floor'. Frisk screamed as they felt their spine snap, and they moaned as they tried to move. The spirits winced at the noise.
"PITY. I HATE DOING WORK. BUT I GUESS I COULD MAKE AN EXCEPTION FOR YOU. HEH HEH HEH." Sans chuckled.
He channelled his power into his maw as the Blasters took pot shots at the paralyzed maniac. When the whining noise his charging was making turned ear splitting, the Blasters flew over to his maw, circling as he released it all at once. After adding their magic to the blast, the ball of energy was shot straight at the human. It slammed into them at full force, detonating with enough force to shatter the column and turn the screaming Human into just a bloody stain on the 'ground'.
"GEEETTTTTTT DUNKED ON YOU DIRTY MEGALOMANIACS! HEH HEH HEH. DON'T GIVE UP YET... IT'S NOT OVER. I STILL NEED TO PAY YOU BACK FOR ALL THOSE GENOCIDE RUNS."
Sans channeled his power into loading his last save. The world re-winded, and the trio of psychopaths were facing the Judge once again.
Hey, hope you enjoyed Sans kicking some major ass!
I got my ideas for his look by mixing some parts from TratserEnoyreve's Seraphim Sans and abadtime's BOTWOT story's Sans.
I then added my own messed up imagination to create what I like to call Epilogue Sans.