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Sans and Frisk walked through what Sans had dubbed, the Old Lab. Sans held one of his hands high into the air, illuminating the decrepit corridor with a soft, reassuring blue light, while Frisk clung to his other one, completely and totally terrified. They had taken a small break for Frisk's sake before moving deeper into the Old Lab, until Frisk was as calmed down as they could be in a creepy place like this. Their footsteps on the grimy tiles sounded like it was booming, and the echoing, empty halls made it sound like there were many, many more people than just Frisk and Sans in the Lab. A door, with a blinking, red, blue, and yellow light on it stood at the end of the room they entered, and Frisk was merely glad that they were out of the hallway. Beds were set up around the room, some overturned, obviously by monsters. Sans brightened the light emanating from his hand, leaning down to inspect something on the floor. There was a note, and the paper had drops of... Something on it. Sans turned it over to read anything on the back of it, before re-reading the front of it to Frisk. "it says: something's wrong. everything's wrong. all of us, ther smthn wrng wit uss.' ... the rest i can't read. it's just gibberish. well... that's a good sign." Sans mumbled sarcastically, putting the note on top of one of the beds that wasn't overturned. "there's more drops of that weird stuff... on the ground." He mumbles. "there's definitely something down here. tell me if you hear anything..."

Frisk nodded, glancing around, their nerves immediately set on edge. "it's okay, kid. don't worry. you're going to get out of here alive. alright?" Sans reassured them as they walked through the rows of beds to the door with with the lights on it. "pff. i'd blast this thing open in a second if we weren't supposed to not attract whatever's down here. looks like we're going to have to look around for the keys. unless you wanna stay here and wait for me to get done?" Frisk shook their head quickly, tightening their grip on Sans' hand until his expression was forced. Well that hurt. "alright alright, i get it. there's another hall down here, come on. it looks like it splits into two other halls, so you get to pick which way we go." Sans said, walking down the other hall. "left... or right?" Frisk pointed right, and they began to walk. "hopefully, this is the 'right' way." Frisk was impressed the he could still crack jokes at a time like this. He chuckled, despite the fact that they didn't give any response as they walked. The hall opened up into a room where there were dirty mirrors set onto the wall, and the light from Sans' magic lit up the entire room as a result of the mirrors. Frisk paused, looking at it, staring at the hairline cracks racing down the surface of it, and their reflection. They were still slightly wounded from their fall in the elevator, and their face, knees, and arms were bruised. It was still them though. Sans paused, looking at his own reflection.

"huh. never knew i looked so tired all the time... i wonder if my mask actually works." Sans mumbled, before pulling his scarf over his mouth. "yup. cool." He muttered, before putting a hand on Frisk's shoulder, gritting his teeth. "kid. you see that too, don't you?" Sans whispered down to them, and their eyes traveled up the mirror. A white blob loomed over them, its form appearing to melt and shift. They nodded slowly, and Sans turned around, his eye flaring blue and yellow. A drop of white fell from it's surface, splashing on the floor. The creature quickly backed up, a warped growl coming from a hole in its body, which must be its mouth. Frisk couldn't help but stare at it, noticing the dark red around it. Fun. "well, hello there, beautiful." Sans hissed, staring at it with a burning hatred in his eyes. "who do you think you are, picking on a kid?" Sans said, and it began to howl, running forward to attempt to body slam the two of them, its massive body sliding towards them across the ground. "not much for talk, eh?" Sans said, before using a wall of bones, shoving it backwards into the wall. Frisk wielded their stick, and attempted to slash at it, but Sans stopped them midair, his hand glowing blue.. "leave this to me, kid. if you kill anything, all of the monsters will put an even bigger target on your back. focus on dodging this thing's attacks." He dropped Frisk, letting them move again, and turning back to his enemy, which barked at him, its 'mouth' foaming with a white froth. "that is not a good look for you." Sans muttered, before sending out more bones to attack the monster. More drips of its body fell onto the floor as it moved, unable to dodge the attacks. In fact, it almost looked like it was trying to get hit by the things. At least, near its mouth. It took a leap to catch one of Sans' attacks, but merely got hit, and fell to the ground once more.

It bounded towards Sans, a bark coming from it. He prepared to dodge it, getting pissed from the fact that it was barking so loudly. It was bound to attract anything else in the lab, and Sans did not want to deal with it. Frisk however, stared at the monster. It had been barking like a dog, and had even been trying to catch Sans' attacks, despite the fact that it would have hurt it anyways. It barked again, attempting to bite Sans, and that was when Frisk realized... "Sans, wait!" They called, and he immediately stopped, setting up a bone shield. He knew it must be important whenever they talked, this must be important. "That's a dog-"

"duh it's a dog of some so-" Sans gritted his teeth, attempting to pull his shield out of its jaws in vain. "hey, let it go-" He hissed, and it was ripped out of his hands.

"It's a dog, and what do you know dogs like?" Frisk said, and Sans stopped, a bone appearing in his hand, and the bone shield suddenly disappearing. He held it over his head, waving it around, immediately catching the monster's attention. It stamped its many feet on the ground, barks coming from its mouth. In between its legs came the shapes of a dog's face, and they looked excited to finally have something to do, to have someone to play with.

"hey, c'mere!" Sans said, leaning past the dog-like monster, and spotting another door. "hey, go and-" Sans threw the bone, using his magic to speed it into the right direction. The monster turned, bounding towards it through the doorway. "fetch!" The stones above the doorway shone with a blue light from his magic, before crumbling as it squeezed through, blocking its way. Sans gritted his teeth, before sighing. "well then. nicely done, kid. it's not going to be too happy when it finds out that that thing will disappear." Sans explained to them, walking into a room, where the creaks of old generators groaned, and, on the floor, as if was slightly glowing, a yellow key. "lucky break. come on." Sans said, bending down to pick it up. "if you have any other ideas on what to do with anything else we find down here, tell me, alright? that was a really good idea." He said, before taking Frisk by the hand and walking out of the set of rooms. They were back in the hallway, and they didn't go back to the room with the beds in it, instead continuing forward to what would have been the left path to find another key. San only made it about one step into the next room before stopping in his tracks. Frisk leaned past them, their eyes widening upon seeing something that appeared to be a bird-skull shaped contraption hanging over the top of what appeared to be an operating table, which had a large red stain on it.

"What... The..." Sans whispered, walking forward to the machine. He paused upon reaching the machine. Carefully, he climbed on top of the operating table. Frisk walked into the room, staring at the bird skull and wondering what Sans was doing. With a clank, a piece of metal fell on to the operating table, and a red light flooded into the room, coming from the machine. Frisk realized that Sans was dismantling it, and ran up to look. The thing causing the red light was a red, glowing fluid in a large vial, which Sans carefully detached from the machine, putting his old skills as a Royal Scientist to work. "I know what this is." Sans whispered. "... Hey, kid. Can you tell me... If you smell that?" He asked Frisk, who nodded. There was a foul smell in this room that reminded them of the med bays in the camps they had been in. Sans leaned down to the table, inspecting the red stain on it. "This isn't that old. I'd know..." He whispered, before hopping off of it, still holding the vial. There was a large pit surrounding the room, which the terrible smell emanated from, and Sans took a step into it, a bone materializing to catch him before he fell, making a staircase of bones. Frisk began to follow him, cringing at the scent, keeping the red glow in sight. Lightning fast, Sans held out a hand, making Frisk stop. "Kid... Don't. Look." And that immediately made Frisk look into the darkness below them for mere curiosity. Their eyes widened, and their stomach did a full flip, a feeling of nausea coming over them as they staggered on Sans' staircase. Sans turned to steady Frisk, who couldn't tear their eyes away from the horrors in the pit. Corpses. Rotting, decaying, definitely real corpses from humans. Frisk just stood there, staring at the rotting bodies of their brethren. They swallowed hard, shaking all over. Sans seemed almost completely unmoved by the sight of so much death before him, more concerned about the red vial and Frisk. "Some of these are new." Sans whispered, and Frisk, unable to hold it back, gagged, the bile rising in their throat. Sans quickly took their hand to steady them as they threw up, only adding to the disgusting mess in the Old Lab. Frisk sobbed as they did. They just wanted to leave the Underground, and as Sans picked them up using his magic, they curled up into a shaking, sobbing ball of misery.

They found themselves set down on top of a bed, as Sans had returned them to the room with the many beds. "kid. take a few minutes, alright? lay down, sleep if you want to." Sans said to them. "i don't think you should see anything else in here." He explained to them, and as they opened their mouth to protest, he took them by the shoulders. "you need to stay here. i don't want you seeing something... Something like that again." Sans mumbled, his eyes turning pitch black as his gaze turned to the ground. He shook his head, and fixed on a smile. "just think about the things you liked about the surface and just stay on this bed, alright? if even the slightest thing happens, call me on your cell phone. and, as for light..." Sans said, before using his magic to conjure up a small, glowing bone. "kinda like one of those glow-stick things you humans have when you shoot those bright lights off into the sky, and they explode. i've seen a few of those shows before, when i could. anyways, stay safe kid. don't leave this room unless you absolutely have to. you know what to do. i think i know what happened in this place, and i need to find the other keys. okay? good luck." Sans said, before walking off. Frisk didn't follow him, holding the softly glowing bone to their chest as they lay down on the dusty bed, which was surprisingly done. They kicked the covers away from them, laying on the bare mattress with their head propped up against the pillow. That was something they wanted to forget, the piles of corpses in the room with the weird machine. But, apart from their useless longing to forget that memory, Frisk was wondering what happened here, the glowing red vial, and how they would be able to keep avoiding guards in the Underground if they even were able to escape.

Sans walked through the dirty, foggy halls of the Old Lab, pulling out the red vial. "so, i guess you're the reason why there's loads of bodies in that room? hmph. what a dead loss. get it? ya know, because, dead bodies..." He said, talking to it, and waiting a few seconds before sighing. "of course. you're an inanimate object. you won't respond." He mumbled, and rubbed his eyes with one hand as he walked. "keep it together sans, you gotta do this for the kid. then everything will be back to normal when they hit that reset button... right?" Sans said, before realizing, once again, he was simply some crazy skeleton talking to himself in a room with a million corpses, and a skull shaped machine. "... you're determination, i know that. the essence only humans have. so that... explains all of the dead bodies. and this machine... extracts it. when it's done, the bodies are thrown into the pit below. gruesomely effective. but, there is always the question of 'who.' who mercilessly and so expertly murdered all of these humans, while extracting determination? isn't it amazing, having a mystery to solve?" Sans said to the vial, before facepalming, forcing himself to walk out of the room and to shut up and stop talking to himself like a psycho. As he walked, he stared into the various hallways, seeing a shower at the end of one. Now that was... Really weird. Sans pulled apart the curtain, obtaining the red key by doing that, and continued on his way through the Old Lab. His footsteps sounded thunderous on the dirty tile, and it made shivers run up his spine as he walked. Now, where was that blue key? Another room opened up, with several fridges, and a few sinks were there, with a single red blinking panel stuck on the wall. Sans walked up to the panel, beginning to read it, before his hands dropped to his sides, staring in shock at the writing on it. No, it wasn't in a conventional, readable language that every monster and human could recognize, but odd symbols... That he knew how to read.

LOG 1: This experiment will focus on the effects of Determination on young monsters. I have two subjects, which I have named 1 and 2 for my convenience. I didn't take them from the surface, and instead, I made them. It's fascinating, isn't it? First, I need to see how they react to me before I attempt any further testing on them.

LOG 2: The shorter one, number 1, was hostile. I think it attempted to use a magical attack on me, but it failed. Number 2, the taller one, on the other hand, seemed to be almost friendly. It's gotten attached already.

LOG 3: Testing begins. Number 1 will be injected with small amounts of Determination, while Number 2 will not. I will compare their power after each injection via physical and magical tests.

LOG 4: Number 1 attempted to resist. I have to be careful not to break these monsters. They are too valuable for science. If I can find a way to inject determination safely into monsters, we will finally put an end to this damned war once and for all.

LOG 5: Number 1's first injection was catastrophic. They nearly broke everything. The next time I injected it with Determination, it escaped using magical attacks, taking Number 2 with it. I need to get out there and find them... Or sit back and observe their growth. After all, even if I grew them myself, they are still little monsters. I believe I should stay back and watch them. In the meantime, I should find out what else Determination does...

- WDG

Sans took a step back. WDG. There was something about those initials, about those symbols... A ringing came from Sans' cell phone, snapping him out of his trance, and the second he saw it was from Frisk, he ran through the halls, teleporting back to them, nearly running in right there and then, when he noticed a figure standing over Frisk. He paused, waiting for a good moment to ambush it. He could barely see the glow of the bone he had given Frisk, because Frisk had buried their face into the pillow, hiding the glowing bone. An extension of the creature's body melted out of its body, and the shape of a hand appeared. But, instead of reaching for Frisk, it reached for the covers on Frisk's bed, pulling them up to their chin. With a few drops of its body splashing onto the covers, it reached to pat Frisk's head, before walking off into the shadows of the True Lab. Sans was astonished. There was a creature that had shown compassion, even in its barely functioning form, and to a human. Sans walked forward, going up to Frisk, who was shaking, their red brown eyes wide in fear. "i'm here, don't worry." He whispered, and Frisk sat up, closing their phone. "was that monster what you called me about?" They shook their head, before digging into their pocket. They pulled out something blue, and Sans' eyes widened. "you found the last key! i guess it was a good thing that you stayed around here, huh? you used your detective skills like a pro. nice job, kid." Sans said, his smile genuine, and he helped them down from the bed, leading them to the door which was lit up with blue, yellow, and red. Frisk and Sans shoved the door open, and it occurred to Frisk that the doors reminded them slightly of vault doors. Sans leaned in first, his hand shining with blue light to illuminate the space. A warbling moan came from inside the room, and immediately, Frisk darted as close as they could to Sans' side, terrified. In the very corner of the room, its form shifting and warping as it did what appeared to be standing up, was a disgustingly multicolored creature, drops of its body splashing on the floor as a result of the determination. A call, a mix between a squawk, a sweet, gentle voice, and a growl, came from the creature as it shifted towards them. Frisk could see the form of one of the dragon-like monsters that lived in Snowdin's forests appeared for a moment before disappearing back into the mass of the creature, replaced by one of the eye-monsters they had seen in the Ruins. Frisk and Sans were both terrified despite themselves. But who could blame them?

They had fallen down an elevator, chased through the Underground by Undyne and her Royal Guards, fought a dog creature, ran into the determination extraction machine, saw a pile of dead bodies, found a mysterious science log of sorts, and now... They were faced with a monster made of many, many other monsters.

"holy... shit." Sans whispered, as the beast lunged, its cry piercing through the Old Lab.