Toriel stood in front of the exit to the Runes lost in thought; Frisk had gone to bed a short time ago having exhausted herself from magic use leaving her to her own thoughts, and her concerns for Frisk. Despite what Frisk had said about being alright Toriel had seen through Frisks smile all too easily, after all that was the same smile, the same mask, even the same excuses that she practiced in the mirror every morning for over three centuries. "Oh Frisk, there is more to your condition than you said isn't there my dear child? Why, why won't you tell me the truth?" Toriel whispered to herself. As Toriel stood looking at the doors, distressing thoughts flowing through her mind a faint green glow appeared behind Toriel causing her to turn only to come face to face with a Dragon made entirely of white bones. For a moment Toriel's magic flared and fire erupted in her hands as she prepared to defend herself before she remembered that Frisk had mentioned that her magic could summon Dragon skeletons. Toriel took a deep breath and closed her eyes as she extinguished the fire and recomposed herself before she reopened them looking into the dragon's eyes, the two stared at each other for a moment. As Toriel studied the dragon she noticed that its right eye socket glowed green and and the left glowed red, almost as if there were two magics in it.
Kindness studied the Monster before them, when they had approached the monster it had seemed upset, they hadn't meant to startle the Monster but now they were standing in the middle of a corridor stuck in the middle of an impromptu staring contest, Kindness shuffled uncomfortably not knowing what to do or daring to look away. "Um...Could you please move so that I may pass?" The Monster asked. Kindness tilted their head in thought. Master was behind them, if they let the Monster pass they could hurt Master but Determination was with Master and no one was stronger than Determination, Kindness didn't know what to do and so chose to do nothing and continued to stare at the Monster.
"Let her through, Toriel won't hurt Frisk." A voice said, causing Kindness to break the staring contest to take a side look at Shadow; Shadow said Monster Toriel was safe, she would trust Shadow knew what it was talking about. Kindness stepped aside and let Monster Toriel through.
Toriel sighed in relief as the Dragon slowly and somewhat reluctantly moved aside, allowing her to pass by as she started to climb the stairs, the Dragon turning and following her up. As they reached the top of the stairs the two monsters turned and approached the room Frisk was in. The door was open a crack allowing Toriel to peer into the room only for two red eyes to stare back, freezing her in surprise. The eyes rested right next to Frisk and slowly they began to approach the door allowing the faint light to illuminate the small Dragon that they belonged to. The Dragon was no larger than a mid size dog but Toriel knew that for monsters size meant nothing. Determination stared at Toriel for a moment before returning to Mama.
Frisk awoke the next morning to the sound of rattling bones and looked down to see Determination nestled in her arms snoring. Frisk smiled and hugged the little Dragon skeleton, while the other six Dragons were fully grown and able to care for themselves, Determination was still a hatchling. Despite what she had told Toriel, Frisk knew why she was able to use magic after all, it took the combination of both a Human and Monster soul for anyone to be strong enough to pass the barrier and return to the surface but Frisk hadn't used a Monster's soul. Instead she passed through after having absorbed the other six human souls to defeat Omega Flowey.
Frisk sat up slowly as to not wake up Determination, she had learned quickly that he was not a morning Drake, and groaned as she rose to her feet and noticed that Kindness had been on guard duty last night. Frisk smiled and tucked Determination into the covers and grabbed a spare blanket before going over to the other monster and covering her as well. After that was done Frisk walked out the door and walked to the main room, seeing that Toriel wasn't up yet she walked over to the bookshelf and pulled a well worn book from it, 72 uses for snails. Smiling at her choice Frisk walked over to the fireplace her hand lighting with a small ember of Fire Magic which she threw onto the wood in the fireplace before she walked over to the large chair and sat down opening the book and beginning to read, sometime later Kindness walked in along with a very sleepy Determination who yawned and jumped into Frisks lap before falling back asleep. Kindness shook her head and lay down next to the chair, however the faint crackle and warmth of the fire soon lulled them to sleep as well. Frisk smiled at the two and returned to her reading, waiting for Toriel to wake.
Toriel awoke with a groan as she climbed out of bed and walked to her dresser, retrieving her robes she slipped them on over her head. "I may need to lay off the cinnamon." She grumbled as she walked down the hall passing Frisks room and the stairs that lead to the exit before finally reaching the main room. As Toriel reached the main room she came to an abrupt stop as she tried to stifle her laughter at the sight before her and only partially succeeding. Frisk sat in her green chair reading, the small Dragon nestled in her lap with another larger one curled up by the fire. A giggle escaped Toriel causing Frisk to look up and smile warmly. "Morning mom." She said without hesitation.
"Good morning my child, I hope you slept well." Toriel asked, receiving a nod from Frisk.
"Mom… there is something I want to talk to you about." Frisk said reluctantly, causing Toriel to tilt her head at Frisks tone, a look of concern appearing on her face.
"What is it Frisk?" She asked as Frisk shuffled in the chair for a moment before looking up to Torial.
"Will you join me as I cross the Underground?" Frisk asked as she looked at the old goat monster.
Torial froze for a moment before sighing "I'm sorry, Frisk I would love nothing more to go but I...I can't. Seven souls, seven souls to break the barrier and free us. I can't watch you go and die. No, when you leave I will remain but let us move away from dreary talk and have some breakfast."
After breakfast Torial walked Frisk to the exit and said her goodbyes, Frisk opened the doors and exited the Runes before turning and watched the doors close and Toriel wave goodbye one last time before the doors sealed shit behind her. As the doors closed a maniacal laugh came from behind Frisk causing her to sighed and put on her friendliest smile before turning to meet the flower. "Well, well, well, you know for being the goody two shoes you sure are a sadist. Not even I'm cruel enough to do what you just did. Now poor Toriel will have to live with the fact that she willingly sent you to your grave twice!" Flowey exclaimed, smiling and laughing.
For a second the mask slipped and Frisk growled approaching the flower, her right eye flaring red and a fireball appeared in her hand, with a roar the fireball slammed into the ground missing Flowey by millimeters. "You're lucky flower, if not for the fact that you are the only chance to bring back Asriel then I would eviscerate you without hesitation or regret. But I wouldn't be able to forgive myself if I ever hurt my baby brother." Frisk said the anger turning to sadness at the end. "We will bring you back to who you were."
Flowey stared at Frisk as she walked away before bursting into laughter. "Tell me Frisk, how far are you willing to go to bring me back? If you had to, would you give me your soul?"
"If that's what it takes?" Frisk asked as she stopped and looked over her shoulder at the giggling flower. "Then yes." She said as she turned, pulling her old beaten bluish purple ball cap on and walking out the doors to the ruins.
Flowey froze and turned to stare at Frisk but she was already gone the sound of the Ruin Doors booming shut echoing in the chambers. "You really are an idiot." He said darkly before he plunged into the ground.
Sans sat at his sentry station thinking when the sound of the Ruin doors closing with a boom echoed through the forest. With a sigh Sans rose and snapped his fingers, teleporting to the doors to the Runes and walked back toward the way he came, every time a Human exited the runes he would meet them at the gate his brother made but as he walked down the path he noticed that it was unusually quiet and there were no footprints so when a loud crack came from behind him he did what his instincts told and ran all the way to the bridge however once he got there though there was no Human. "Ok, this day is just getting weirder and weirder." He whispered but before he could take a step the sound of snow crunching underfoot approaching him from behind caused him to freeze in fear.
"Sans the Skeleton, don't you know how to greet an old friend? Turn around and shake my hand." A female voice said in a cold tone causing Sans to gulp before turning, pulling his hand out of his jacket and shaking the person's hand only for a look of bewilderment to cross his face at the farting sound that followed causing the woman to laugh and let go of his hand. "Ah, the old whoopee cushion in the hand trick, gets them every time doesn't it?" Sans stared at the women before him in shock, she wore a dark blue sweater with a pair of brown jeans under an open black trench coat with the deltarune embroidered on both shoulders and the chest above her heart, a long tattered red scarf similar to his brothers was wrapped around her neck flowing all the way down to the small of her back, fingerless gloves decorated her hands and an old worn blueish purple plain baseball cap with no logos on it covered her head allowing the brown hair that was pulled back with a simple blue hair tie to fall straight down the middle of her back almost reaching the end of the scarf she wore. Despite the cap shadowing the upper part of her face, the smile and glowing red eyes filled with mirth that shone through the darkness illuminated someone Sans had not seen for over fifteen years, someone who had brought him the most joy and hope ever. "F-Frisk?" Sans asked, barely able to speak before he fainted.
Sans groaned as he awoke on the sofa. "Heh, what a weird dream." Sans muttered to himself but didn't move to get up, he just lay there listening to his brother and Undyne talk with someone in the kitchen. "... Wait what?" Sans shot up in surprise before quietly getting up and walking over to listen.
"So for the past fifteen years you've been traveling all over the world and learning all about not just your magic but about the barrier as well? That's so AWESOME!" Undyne yelled in excitement at the person who was sitting inside the kitchen with her and Papyrus.
"UNDYNE PLEASE BE QUIET; MY BROTHER IS STILL ASLEEP AND WE SHOULD NOT WAKE HIM." Papyrus said. "THOUGH I MUST ADMIT THAT THAT IS QUITE IMPRESSIVE FRISK, WHEN MY BROTHER WAKES WE SIMPLY MUST HAVE A REMATCH SO THAT WE MIGHT SEE HOW YOU FARE AGAINST I, THE GREAT PAPYRUS!
Sans gasped, it wasn't a dream, Frisk was back. Sans felt the ground rush to meet him again and was barely able to walk back to the sofa and sit down. Why was she back? Was she going to stay? What did Undyne mean by Frisk having magic? Sans was so lost in thought that he didn't even notice Frisk enter and approach him until it was too late.
"Hello Sans, it's been a while hasn't it?" Frisk asked as she stood in front of the Skeleton Boss Monster. Sans looked up at her in shock, his eye sockets widening as he looked upon Frisk, now all grown up.
"Heh, guess I can't call you kiddo anymore now can I Frisk?" he asked, his grin slipping into sadness as he looked at her. "Good heavens, it's been what, fifteen years?" he asked as he leaned back into the couch. "I'd of thought you'd go and forget about us but here you are back down here in the Underground, I assume this isn't a social visit?" he asked, receiving a chuckle from Frisk.
"As if you'd complain ya bonehead." Frisk said as she walked over to the couch and sat beside him placing an arm around him. "But you're right, I've come to break the barrier and free you all." She said, causing Sans to sigh, his mood darkening as look down at the ground.
"Not possible kid, we ain't got a single soul left." Sans said, earning a shocked look from Papyrus and Undyne.
"BUT BROTHER, KING ASGORE HAS SAID HE HAS SIX SOULS, WITH FRISK HERE WE ONLY NEED HERS AND THEN WE ARE FREE." He said, causing Sans to give a short dark chuckle.
"And that's what the king wants everyone to think." Sans said.
"What's going on Sans, you better spill or else I'll just go to the King and ask him myself!" Undyne yelled in confusion.
"Sans, I think you should explain what's happening." Frisk said as she looked at the Skeleton beside her with an understanding look. "I have an idea but I need all the facts before I can explain anything." She said and Sans sighed.
"Fine, but just know that anything I say now can't leave this room." He said, receiving nods from the three. Sighing again Sans leaned back and began his explanation. "Fifteen years ago when Frisk first fell down we did have six souls, when Frisk managed to travel the underground befriending every monster we were all rooting that she would not die but of course she was the last soul we needed. Of course everyone also knows that Frisk fought the King and that she obviously won but what everyone doesn't know is that Frisk single handedly saved Asgore's life that day. Asgore told me that after Frisk beat him she offered him mercy and in exchange he offered to make her a part of his family and she accepted."
"Wait, so doesn't that mean Frisk is now technically the princess?" Undyne asked in shock, receiving a nod from Sans.
Sans nodded. "Yeah, Frisk is technically a princess but before anything could happen someone attacked Asgore from behind and knocked him out, however before he fell unconscious he saw Frisk take what was meant to be the killing blow in his stead. When he came too Frisk was exiting the barrier and there was no sign of his attacker, or of the six souls we'd spent all those years collecting." Sans said, his voice growing tired as he finished. "From what the King's figured out a monster tried to kill him and take the six souls and Frisks stopped him but as a result the six souls were lost."
Frisk nodded. "He's close but that's not exactly what happened." She said as Sans, Papyrus and Undyne looked at her. "Yes someone did attack Asgore and stole the souls, I fought them and beat them but the souls didn't just disappear." Frisk said slowly as she looked down. "I… what you and no one else has asked or wondered is how a single human crossed a barrier designed to allow only one with both a human and monster soul through."
Undyne frowned in thought as Papyrus looked confused; however Sans's eye sockets widened as the eyelights in them seemed to tremble. "Frisk… you have the souls." He said in shock causing the other two monsters to look at Frisk in shock as well.
Frisk nodded. "During the battle I was able to convince each of the souls to help me and after the fight I thought they were gone but instead they had stayed with me. Since they had nowhere to go they eventually were absorbed into my soul."
Sans nodded. "I overheard Pap say that you could use magic and if that is true then it makes sense how you can now. You walked straight through the core during your travels, no doubt you were saturated in monster magic as you went through it and combined that with the power of the six human souls and your own. Kid, you have seven souls plus the magic of a monster all trapped in a single body and given your magic's unique power it's a near guarantee that there would be massive side effects, the least of which being you could use monster magic and worst case being you become at least part… monster…" Sans trained off as he looked at Frisk.
Frisk shifted as Sans looked at her intently. "So… I didn't think you'd find out this soon but yeah…" She said trailing off as she scratched the back of her head. "The uh... side effects changed me in several ways both physically and mentally." She explained as she leaned forward and pulled her trench coat off. "One of the mental ones is that I became really laid back which is more of a small side effect but well…" Frisk sighed and snapped her fingers allowing the illusion of her human form to disappear once more. Just like with when she showed toriel the skin on her right arm and around her left eye slowly started glowing red and fading till all that remained was the bone, her eyes changed as well with the sclera disappearing and turning black on her right eye and her left became an empty eye socket with only a red eyelight. "I guess I'm part Skeleton now, well I mean I've always been part skeleton since I always had bones but I guess it's just a bit more literal." She said with a nervous chuckle as the three monsters looked at her in shock.
"Frisk… why didn't you tell us about this sooner, better yet why didn't you come to us sooner?" Undyne asked as she looked at Frisk with sadness. "We could have helped you." She said as she moved and placed a hand on Frisk's shoulder.
Frisk looked down, not answering for a moment. "Because when this happened I was on the other side of the planet in Egypt researching the barrier. It was that trip that actually allowed me to come back here so soon." She said as she looked at the gathered monsters with a smile. "Because the other six souls merged with my soul I have the power of seven souls but if I were to use my soul to break the barrier I'd die so I had to find an alternative. While I was in Egypt I found documents explaining the original use of the barrier before it was repurposed to imprison monster kind and because of this I know how to break the barrier." Frisk said with a smile causing the monsters to freeze in shock.
"Wait, you actually found a way to break the barrier!/YOU CAN BREAK THE BARRIER!" Sans and Papyrus yelled in shock as Undyne sat in shock.