Ok, the Ruins are probably full of puzzles just like everything else in the Underground so at least I'll have an excuse for why it's taking me so long to get through them, Sans thought. I guess all I can do is keep my eyes open and look for any monster there is… No that won't work, I have to make sure I find them all.
Just as that thought entered Sans head a small frog monster appeared in front of him.
"Ribbit. (You aren't from around here, who are you?)" the frog monster inquired.
"Someone who has a really tough job to do." Sans answered before gently setting Frisk's body and Chara's soul down and engaging the frog monster in a fight.
"Ribbit. (Huh, what are you doing?)" the frog monster inquired before creating magic flies that flew towards Sans only for him to disappear. "Ribbit. (We don't have to fight.)"
Sans just sighed quietly before appearing behind the frog monster. "Actually, we do."
With those words Sans created a wave wall of bones and slammed them into the frog monster killing it instantly before Sans lifted Frisk's body and Chara's soul again and continued into the Ruins. (1)
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"This doesn't get any easier, guess it makes sense. I'm not the one gaining LV, Chara is. I just hope this plan works, because it's taking everything I have not to just give up again." Sans said quietly before turning to look at the three piles of dust behind him. "Still, I have to be absolutely sure before I leave the Ruins that I got everyone."
As Sans said that, two more frog monsters appeared in front of him and started attacking him with magical flies.
"Ribbit. (Why are you doing this, you're killing everyone.)" one of the frog monsters mentioned as Sans dodged the flies.
"Ribbit Ribbit. (Did something happen to make you do this?)" the second frog monster asked.
Sans looked down before his eye started to glow and a skull appeared behind him and blasted the two frog monsters turning them both into dust.
Chara's Soul LV 3
"Are you going to keep following me through the entire Underground weed?" Sans questioned as the flower popped up behind him.
"I'm not getting in the way, I'm just watching this one." The flower answered. "This is really interesting."
Interesting, I guess from his perspective it is. Not how I would put it, but still it isn't like I have any choice, Sans thought. "What can I say, we've both been through the same song and dance so many times… I guess we both needed something different to happen."
"This is definitely different." the flower noted. "Well I'll let you get back to work, there's still a few more before you get to her."
With those words the flower went underground leaving Sans alone with the dust of all the monsters he had slain.
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"Now my child, the Ruins are full of puzzles." Toriel explained. "They are an ancient fusion of diversions and doorkeys."
As she said that, Toriel stepped on four of the six buttons on the ground before flipping a switch on the wall causing the door to open.
"So to get from room to room you have to solve puzzles?" Frisk asked.
"Yes, please come with me my child." Toriel answered with a smile as the two of them walked into the Ruins. "Would you like to try the next puzzle? I've marked the switches that you need to hit."
"Ok, thank you." Frisk replied before walking up to a switch with an arrow pointing to it and pulling it.
"Very good my child, now there is another switch in this room that you need to pull in order to open the way." Toriel told her.
Frisk smiled before walking across a small bridge and noticing two more switches with an arrow pointing to one of them and pulling that switch causing a wall of spikes to lower into the floor.
"Thank you, that really helped." Frisk smiled.
"I'm glad to hear that, now come along my child." Toriel smiled.
As Toriel said that Frisk smiled and followed her into the next room where a training dummy was standing by itself.
"Huh, what's the puzzle in this room?" Frisk asked.
"This is not a puzzle my child, in the underground you may encounter monsters that will engage you in a fight." Toriel explained. "If that happens try and strike up a friendly conversation to stall for time. I will come and help you my child."
"Thanks mom." Frisk smiled before suddenly freezing.
"Did… did you just call me mom?" Toirel asked.
"I'm sorry, it just happened, I…" Frisk started. Oh, usually I wait until I have the phone to do that. This won't change everything will it, I promised everyone would be happy and I'd break the barrier with Asriel.
"Would that make you happy, to call me mother?" Toriel inquired with a smile. "I suppose it is fitting my child."
"Yeah, it really is mom." Frisk smiled before walking up to the dummy. "Hello there, how are you today?"
The dummy just stared at Frisk without saying anything.
"Wonderful work my child, come let us continue." Toriel smiled.
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"Been a while since I've seen anybody in here." Sans noted to himself. "Guess that means I'm nearly done, all that's left is… her."
Suddenly Sans collapsed to his knees.
"Hello, where are you?" called a familiar voice. "Is the human alright, it's been taking you so…"
Suddenly the female goat monster noticed Sans on the ground with Frisk's body floating next to him.
"Actually, there's something I kind of need to tell you… um sorry I never got your name." Sans started.
"Toriel, but what's going on?" the female goat monster questioned. "Are you hurt, what about the human?"
"The kid, she's alright." Sans answered. "Actually Toriel, I haven't been completely honest with you. It wasn't that flower that injured the kid."
"What are you talking about?" Toriel asked.
"It's… complicated. The short answer is it was someone who really considered the kid a friend and didn't want to put them through something worse than death itself." Sans answered before turning to Toriel. "Sorry, but I have to do this."
As he said that Sans entered a fight with Toriel and launched a wave of bones at her.
"What in the world?" Toriel questioned as the bones struck her. "What are you doing?"
"You wouldn't believe me if I told you." Sans answered before closing his eyes. "It's a beautiful day outside. Birds are singing, flowers are blooming. On days like these monsters like me, should be burning in hell."
"We don't have time for jokes, the human needs to be…" Toriel started only to have to jump back as a wave of bones rushed towards her. "I don't know what you're doing but we don't have…"
"I'm the one who hurt the kid." Sans told Toriel. "I'm carrying around a nearly dead human that I attacked and I lied about what happened."
Hearing that Toriel gasped in shock. "You, why would you hurt such a poor innocent…"
"It's your turn, if I were you I wouldn't waste if with words." Sans interrupted. "You're the only one left you know, every other monster in the Ruins… I've already dusted them."
As Sans said that Toriel's eyes widened before her hands started glowing with fire magic. "You harmed a poor innocent child, and for what? We don't even have the seventh soul so absolutely nothing good can come from this."
Sans didn't answer and simply dodged out of the way of Toriel's fireballs before throwing more bones at her only for them to get destroyed by another wave of fireballs.
I guess a boss monster won't be as easy to take down as the others, then again this is for everyone's sake, Sans thought. Paps, you Tori, Asgore, and especially Frisk.
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"Ok, mom told me not to leave the room but I need to so I can go and make friends with everybody and we can finally make it to the surface for good." Frisk told herself before looking down. "It isn't fair what Sans has to do, if there was any other way I'd take it but… No, I made a promise that I would be there to break the barrier and that's what I'm going to do."
As Frisk said that she continued through the ruins only to pause and take out her cell phone. "Oh yeah, I almost forgot."
"Hello, do you need something my child?" Toriel's voice inquired.
"No, I just wanted to call and say thank you mom." Frisk said with a smile.
"Did… did you just call me mom?" Toriel's voice asked in shock.
"Huh, oh. I'm sorry, if that wasn't ok then…" Frisk started knowing how Toriel would respond.
"It's fine child, if that would make you happy, to call me mom then feel free to do so." Toriel's voice replied.
"Ok, thanks again mom." Frisk smiled before hanging up. Ok, now then next should be the rocks.
As Frisk said that she walked up to a sign that read three out of four rocks recommend you push them before she smiled and pushed a rock onto a switch causing a wall of spikes to recede into the floor as she walked past only for her phone to suddenly ring.
"My child, for no reason in particular which do you prefer, cinnamon or butterscotch?" Toriel's voice inquired.
"I prefer butterscotch mom." Frisk answered.
"I see, thank you for being honest with me my child." Toriel's voice mentioned before hanging up as Frisk walked and pushed two more walks onto switches only for her phone to ring again. "You do not dislike cinnamon do you, I know what your preference is but would you turn up your nose if you found it on your plate?"
"No, cinnamon tastes good too." Frisk answered. 'Mom's pie's are so good.'
"I see, thank you for telling me that my child." Toriel's voice said before hanging up.
"Ok, now to push…" Frisk started as she went to push the third rock.
"Hey, who said you could push me around?" the rock asked.
"Oh, I'm sorry." Frisk apologized. "Could you please move for me?"
"Well, since you asked so nicely I suppose I could." the rock stated before moving slightly closer to the switch only to stop.
"Could you move a bit more please?" Frisk requested only for the rock to move in a different direction. "Oh, my mistake, I meant could you please move onto the switch?"
"Oh, well I suppose I could do that." the rock mentioned before moving to the switch as a wall of spikes receded into the ground but as Frisk walked up to the spikes they suddenly reappeared.
Smiling Frisk walked back to the rock. "If it isn't too much to ask could you please stay on the switch?"
"Stay there, you're giving me a real workout kid. Ok." the rock said before moving back onto the switch as Frisk walked into the next room.
(Sans has slaughtered every monster in the Ruins except Toriel and is engaging her in a fight while Frisk is progressing through the Ruins in her own timeline and is working on making friends with everyone. Next chapter the two of them will exit the Ruins. As always any reviews or critique is appreciated.)
(1) (In Undertale the more willing you are to harm someone the more damage you can do to them. In Sans case his ATK might only be one, but because of the reason for the genocide and the goal he's ultimately working towards he's able to deal massive amounts of damage to most monsters because he's ultimately trying to save them. However more powerful monsters, and boss monsters are able to take more than a single hit from Sans and as such will require more effort from him to kill.)