~Fellswap Lore

Updated: Apr 30, 2020

Alternate “Nicknames” Info:



Sans: Crimson- Also goes by The Crimson Lord or Bloody Lord. Crimson the harsh ruler of the lands of Tundra and known to be a loyal “dog” to the Queen. His eyes used to be an icy blue but now they are primarily red. If you manage to pull that old him out then his eyes may turn blue again. It astounds him when Frisk causes him to enter this state. A dog without a leash rather. He is frigid towards real affection/emotion unless he has the goal to manipulate you. The only exception would be that of his brother. His pride and ego are legendary and rarely ever takes no for an answer. He is nicknamed the bloody lord for a reason as he has a vampiric nature. His love of the finer things in life leaves him very possessive and greedy as well. His kingdom, being the closest to the Capital, is the most lavish. He is not easily amused, however, if you are able to amuse him he will most likely keep you alive until your amusement wears out. He is also the younger of the two brothers.




Papyrus: Grimm- Crimson’s older brother though even with his stature most think the opposite. He could be classified as the wild one. His eyes are usually a golden/yellow color looking more like pupils then the typical skeleton blank sockets. When he is more in his feral mode those sockets will turn black with that blazing yellow pupil. His eyes in this state resemble that of a wolf. He will be more docile unless it comes to the hunt. That is really when he is in predator mode. Grimm is also incredibly needy and does not care about the state of his captees which he usually brings to his brother. He is submissive to Crimson but that does not mean he will tolerate being treated like a dog. He is still the older brother after all. He is a flirt just to get what he wants and he loves it when others fight back. Unlike his brother, Grimm could care less about all the finery all he cares about is the pleasure, fun, and thrill. Grimm is curious by nature so if you draw his attention you may survive long enough to get on his good side. He also has a well known sweet tooth though his brother tries to discourage him from the habit. The running joke is that he had to have his canine teeth replaced with gold because the sugar rotted the true teeth. That, of course, is nothing but a lie.


Chara: Fuji- Fuji is the twin sister of Frisk and the two could not be further opposites. She is mild-mannered and easily spooked. Her kind heart is often betrayed but she continues to struggle onward despite that. Her physical appearance forces her to cover her left eye due to horrific damage. Under those ebony bangs, she has a scar that is the opposite of Grimms. It is one of the reasons she first draws his interest (that and chocolate). Grimm eventually calls her his Chara-mell apple which is a reference to her name as well as how sweet her personality is. Unlike her sister, Fuji is relatively weak which is why Grimm becomes her protector. She is his little dove.

Frisk: Frisk is known as the “bad” girl type. She picks fights that she knows she can win and likes to get into trouble. She is rather brash but if she sees a fight she knows she cannot win then she will not take that on. The monsters are one such factor of this. She adores her siblings and will do anything to keep her safe even if that means self-sacrifice. She is sassy and overconfident which makes her a perfect match for Crimson. Eventually, he refers to her as his little huntress as she takes just as much joy harming humans as the monsters do. They hurt her sister and therefore they must pay with blood. Her standoffish attitude is also a huge bonus for Crimson as he gets to learn more about her and break down those walls. They both do that for each other. She enjoys Crimson’s darker side rather than his gentle side. Aside from that only she and his closest family ever see. Undyne: Undyne is the Royal scientist and resides in her lab in Windyspires. A place that revolves around aviation. Undyne has a fascination for any kind of flying machines and is more an engineer than a scientist. In order to keep up with the hunt and help her Lord, Alphys, she creates a series of drone-like devices that monitor the “air” of the entire Underworld. It also doubles as a camera for those monsters not participating but watching the hunt take place. She has a very steampunk vibe to her work and likes to wear a pair of aviator goggles at all times. Her favorite type of anime is mech like Gundam or Voltron. She will occasionally wear her lab coat but she prefers her more casual attire. Unlike the rest of the monsters, Undyne does not directly participate in the hunts but rather helps Alphys instead. She has sworn off genetic or soul experimentation but no one knows the true reason why. Alphys: The Lord of Windyspires Alphys is the ultimate warrior type. She will do anything to win a battle which includes a little extra help from her scientist (eventually Lady) Undyne. She is the centurion of the Guard and usually participates fully in the hunts. Her desire for revenge and victory is something that drives her forward and takes extra delight in adrenaline that comes with the hunts. Just like Crimson, she is a formidable foe and usually brags that she will one day rule his kingdom which means their egos butt heads frequently. Alphys loves the spectacle even crafting an arena on the border of Magmire and Windy spires dedicated to combat. The weak cannot be a part of the Guard. She much prefers hand to hand combat and will rarely resort to any type of projectile attacks. She was the youngest sibling of 5 brothers and beat up frequently by her brothers which only made her stronger. She vowed never to be weak again though that mindset has made her into the bully she so sought justice for earlier in life. She likes to binge anime with Undyne when it is all Shonen. {probably a masochist… definitely a sadist} Muffet: Muffet works side by side with her husband and Lord Grillby. Their kingdom is that of Magmire. They are known for their industrial prowess creating weapons and armor for the elite of the Underworld. She takes great pride in her side job which happens to be the only confectionary in the entire kingdom making hard candies and gummies. She is known to indulge in Grimm’s sweet tooth habit as well. She appears kind on the outside but she is truly manipulative especially to those that are unfortunate enough to be caught in her web. Her original concept was that of Hansel and Gretel with her being the “witch”. She dresses in bright inviting colors which is a huge contrast to the rest of the monsters. Muffet also has the ability to spin sugar into horrifying amalgamations when she harvests the souls of captured humans. Human/ monster no more these creatures will do as she commands even sometimes devouring their targets. Just add a pinch of monster dust, a little bit of candy, and some soul. Grillby: Grillby is the Lord of Magmire. Unlike most of the Lords in his position, he does not sit on his throne but rather helps and works with his wife in the confectionary. He finds it relaxing though he does still have to attend to. Grillby is more laid back than most almost the opposite of someone who is sugar high. He is calm and collected which makes him a suitable warrior though he has placed those days behind him. His hobby is to work on new blacksmithing techniques even if his kingdom claims that is below him. His throne room is covered in metal work such as blades and armor only adding to the stigma of the industrial kingdom. He is not one for killing as he feels that there is no honor in such an act. He will send his captees back to the Capital or to whoever is willing to pay. He does not agree with his wife’s tactics however he knows that he can not change that mindset and doesn’t press for it. Toriel: Known as the Ice Queen possibly due to her frozen kingdom or her attitude toward any and all life. Unlike the original UT Toriel, The ice Queen no longer can use fire magic as her soul has frozen over. She has ice abilities and magic in its place. There are rumors that she can cause one’s heart and soul to become numb just being in her presence. She is what one would consider a despot as she does not care for much. Her grief causes her to lash out at others and is called by the lesser monsters, the Mad Queen. She is unaware that her son is still living and refuses to speak to her husband. Even the mention of his name can send her into a spiral of rage. Asgore: The former King of the Underworld Asgore was banished to The Ruins after Toriel’s maddened rage. He is kind and gentle though he knows his own limits. He is not a pushover. His time in the Ruins has shown him how insane his wife has become and with the help of his son they take care of the humans fortunate enough to make it to them. He does his best but even he has moments that force is required as much as he hates the violence. He is still a king through and through ruling over his own “kingdom” as the caretaker. Asriel: The former Prince of the Underworld and son of Asgore and Toriel. Asriel was presumed dead but survived only to escape to The Ruins. His father comes upon him later and they work to help the humans that have been forced to suffer under the tyranny of the Queen. Asriel is mild-mannered and very polite. Even without his station he still acts like a kind Prince. He will stand up for what is right regardless of his own possible sacrifice. When he meets Fuji he sees a lot of himself and he takes on the big brother role for her. In conclusion (Precious Goat boy).

Main Plot Synop:


The Surface: The surface has been overrun by corrupt leaders. It is very much the concept of big brother. They are a council that presides over the affairs of the world. If you are seen as a threat you will be immediately thrown into “prison” without a trial. They hold occasional public trials in the guise of being fair. Just as WTU claims, the very concept of magic is a threat to them so those that have it are quickly disposed of but leaders don’t always do the dirty work themselves. No. In fact, they use another source by means of execution…the monsters. More accurately it is very similar to the idea of throwing your enemies into a kind of gladiatorial arena. It is not technically considered an execution if circumstances lead to death. The humans are not stupid they know what is going on. Some believe in rebellion against the state and some wonder if the monsters could fix their corrupt world. Either way, the corruption continues and they are not above tossing innocents into “the pit” if it suits their agenda. “The Pit” (aka the Underworld/Underground): The underworld is broken up into different factions by location. The only location without a faction or any type of ruler is The Ruins, because of its size and its isolation this is where humans try to reach for some form of Salvation. Asgore, the caretaker, has made it into an encampment for those that have fallen (the innocent ones). It is almost like a refugee camp. Unfortunately very few make it to Asgore’s safe haven. He does his best. Poor goat dad. He is not like canon Toriel however as he will use violence if necessary as he knows that humans are simply using them as tools to get rid of who they deem criminal. There are signs of old campfires, broken tents, and habitation. Before The Ruins is, of course, the main factions. “Snowdin” is the beginning and Crimson is one of the most powerful in the Underworld.


LOCATION SWAPS {INFO in order}: New Home= The Capital Snowdin= Magmire Waterfall= Windyspires Hotland= Tundra The Underworld is backward to its original layout. The humans end up trapped in The Capital instead and they have to make their way to The Ruins to escape. So it would go like this: The Capital -> Tundra ->Windyspires ->Magmire. The closer the faction to the capital the higher the rank in other words because both Grimm and Crimson live in Tundra. Crim is the lord making him one of the most notorious. He is known for being a loyal “dog” to his queen. Whether that be out of loyalty or self-preservation is unclear. Each faction has a lord or lady that rules over it. The ones loyal to Toriel’s (As a side note she is known as the ice queen) regime and their supposed way of life. This also means the closest ones receive the most benefits. Tundra is the one with the most prestige and of course other monsters are trying to strip that title from its current holder, The Crimson Lord. Due to Crimson’s loyalty, he is almost exempt from any wrongdoing in the Queens’ eyes which means he can do pretty much anything he wants. Which is dangerous and I will explain why in a bit. I have a faction ruler list sitting here so I am going to add that to this as well. They are as follows, of course, this does not account for potential power struggles during the story: The Capital -> QUEEN: Toriel Dreemurr Tundra -> Lord: Crimson Lady: N/A Windyspires -> Lord? (I mean she wouldn’t want to be called a lady SHE IS TOO TOUGH FOR THAT!): Alphys Lady: Undyne Magmire->Lord: Grillby Lady: Muffet

The motto of this verse. After so many centuries of humans being disposed of by monsters, they become aggressive. In addition, the anger toward all of humanity begins to fuel violence in the monsters. The hunts deter monster on monster violence. It also adds fuel to Queen Toriel’s fire that one of the humans that fell down the first time killed her son. This, of course, is a lie as Asriel seeks refuge with his father in The Ruins. He helps as much as he can watch his mother lose her mind from afar. It saddens him but he refuses to be a part of this new world order. That is when they realized that humans weren’t just falling into the Underworld. They were throwing the worst of the worst. Their undesirables, criminals, and anyone that dare went against their own agenda. At first, they just captured them and held them in the Capitals network of catacombs but then some began to escape causing damage across their “New Home”. Toriel wouldn’t allow it. A proposal turns it into a game of cat and mouse. The humans are detained and released and then the monsters hunt them down. It used to be about protection but now it’s become a sick twisted death game. The forests of Tundra are littered with traps and deadly pitfalls along with the rest of the locations. A Human’s Fate: Not all the humans that are being thrown into the pit are criminals. The monsters of higher rank occasionally take humans they deem worthy to be servants or slaves. It depends on the monster or the rank but at least those humans are still alive. The hunt is an unspoken death sentence. One monster, in particular, seems to have an interest in bending humans to his will and that is Crimson. The conditions vary widely as some treat their humans well and others poorly. Crimson is known to go through humans quickly due to his bloodthirsty nature. It’s not a common occurrence. In fact, the Queen frowns in distaste over the very notion. The only ones that are spared of any of these fates are the children. Toriel is even more disgusted by humans sentencing their young to die. She takes care of the children that have fallen. In total, she has taken care of 5 children in total.


The Brothers Grimm: Grimm is the wilder of the two brothers and is very much a predator type. His name is derived from the mythos of the Grimm or Black dog. I wanted to keep that dark omen symbology in both his name and design. He slinks around in the shadows so that the black dog aspect is not far off. He also loves watching from trees. He enjoys the catching and hunting aspect of his job and even plays around with his “toys” when he finds them. He will specifically call anyone “chew toy” in a mocking kind of way. That does not mean though that he will not spare you if he catches you. He is naturally curious by things. He also has a little skele tail too. Unlike his brother, Grimm doesn’t really have an ego he just finds his job fun. He is like a giant untamed wolf. Grimm has a love of sweets as well. He admires his brother but he is not bound to his brother. In other words, this is not a master, dog dynamic. He is, however, the more accepting of the two. If he is asked to do something he doesn’t approve of then he most likely won’t. Also just because he has the whole puppy thing going on doesn’t mean he isn’t smart and cunning. Again he likes to play around with those he finds sometimes not even dragging them back to his brother for a while. If you are a threat he will kill you but if you’re not you can probably get on his good side. If he thinks you are cute he will probably flirt with you too. He is not beyond that. He plays the part of the dog quite well. Crimson is more sophisticated. He doesn’t go out on “hunts” himself often as he has a faction to rule over but those brought to him will see first hand that he is an insufferable flirt. He is prideful, egotistical, and commanding. He also has a bad habit of keeping mementos from those he deems worthy (what those are… you don’t want to know). He is stern with his brother and seems very outwardly cold to most unless he is playing up his charm. He is not someone you want to make angry as Toriel considers him to also be the Bloody Lord. His weapon of choice is a scythe. His drinks of choice are red wine and champagne specifically the pink kind. Crimson’s incisor teeth also have that vampire point to them. They are longer than the rest of them. There is far more to Crimson than just a ruthless skeleton lord.


The Ultimate Unlikely Hunters: This backstory will involve Grimm and Crimson’s unusual infliction and conditions. They were both experiments under Gasters research team in the beginning. Having been weak monsters as children unable to gain any LV they had to think of a way to survive. They did not seem to possess the ability to wield magic. Tired, injured, and without hope, Papyrus carried his baby brother all the way to Windyspires banging weakly on the metal plated doors. The Royal scientist at the time, Dr. W.D. Gaster, took the boys in. Unlike Darrius FS Gaster cares about the two brothers. He gives them a choice if they want to become stronger as their souls are not capable of it on their own. Grimm takes the offer hoping it will save his baby brother offering to be the first test subject. At the time Unyne was nothing but a teenage prodigy lab tech watching the events of soul manipulation take place. At first, the process works. Pap is able to conjure new bone-like attacks with magic and all seems to be well. The results cause Gaster to start the experiment on Sans next. By this time complications have already begun to show signs. Pap seems to be more short-tempered and aggressive even with little things. His mood swings cause him to lock himself up being monitored day by day. Sans has never seen his gentle brother this aggressive before forcing himself to look away as they have to strap him down for a follow-up experiment. He tries to help his brother the best he can and takes on the older brother role due to Pap’s inability to think clearly. Even he is starting to change. The longer this situation continues the more Sans becomes numb to the feeling. That is until one day Pap’s condition takes a turn for the worse causing him to lash out, bones shifting and elongating. He drops to the ground in agony transforming into a skeletal beast like wolf tearing the entire lab apart. Sans, on the other hand, continues to take care of his brother but he too is feeling some strange side effects to the soul manipulation. It turns out that each monster’s ancestry buried deep within their soul draws upon a primal power. Not all monsters were about love and compassion in the beginning. Bringing this primal trait to the surface causes adverse physical and biological changes within the two. Sans is more gradual as he starts to be in immense pain. His soul struggles to keep itself together but even he snaps lunging at a lab tech. He zeros in on their soul pulling it from their chest and sinking his teeth into it, draining it of its life force. The pain is suddenly gone. He realizes that he needs souls essence and power to keep that hunger/thirst at bay. It gives him extraordinary abilities. He remembers a long time ago reading about a monster that humans had such a fear of, the vampire. As he comes into power he realizes that humans concentrated soul traits are even better than monster souls. The blood has a high concentration of soul essence which sustains humans as well as monsters (yes the monsters bleed in this). His brother learns to control this new beast within himself but not before he nearly claws his brother’s socket out, hence the signature scar. Crimson has scars on his entire body from trying to reason with his once feral brother. They slowly work their way up to eventually ruling the second most powerful kingdom in the entire Underworld with exception to The Capitol. The constant hunts keep both the brother’s conditions satisfied. No one is quite sure how the two skeleton brothers became this way after Gaster’s disappearance, all except Undyne.



The Story: There are two siblings that fall into this world both twins. One is Frisk and the other is Chara. Since this is a swap, Frisk is more aggressive of the two and highly protective of her sister. She tends to be classified as the “bad girl” type. Chara is the sweet and kind one that will abstain from any violence at all. Frisk is not the usual Chara swap because I want them to find their place amongst the world. She has no problem using violence as a means of protection and self-defense but she won’t actively look for a fight if she thinks she can’t win. The monsters are one such variable in the unwinnable category. Sadly they have magic within their souls hence the soul traits. They both also have the same soul outwardly, Determination, however, there is one other trait that is housed within their soul that makes them very different. Frisk’s is perseverance and Chara’s is kindness. As usual, the leaders of the Ebott Empire are threatened by their potential for magical abilities and as such are sentenced to be executed. Thus they become part of the hunt. Frisk is the first to be captured by none other than Crimson and Chara is found by Grimm. It is strange that Crimson is not his usual self in their circumstances as he can tell, unlike so many others that they have captured in the past, that they are very different. Grimm can’t bring himself to harm Chara due to her innocence and Crimson enjoys Frisks headstrong and sassy attitude. In other words *slaps hands on table* you get a two for one. One Papyrus X Chara and one Frisk X Sans. Both the twins are of adult age. Eventually much to Crimson’s reluctance they decide to help them escape as unlike most of the AU the monsters have no problem staying this way. Not all of them agree but the Lords certainly love their titles and don’t want to give up that power…that is until Frisk mentions that all those horrible corrupted humans on the surface could be like one giant hunt. In which case Crimson is all for. Grimm has his own motivations enraged that the humans did something so terrible to Chara but he would not sacrifice everything to get to the surface because of that vendetta. They make it to Asgore who has all the souls as the Barrier is in The Ruins. He tries to get them to stay instead of sacrificing one of them for their freedom. It’s obvious that the brothers actually don’t want either of them to die. As Crimson says: “What is another century or two? We have all the time in the world.” Frisk and Chara become integrated into the Underworld and though Grimm continues his hunting he doesn’t want Chara to witness it. Crimson just has Frisk as his little huntress. It is unclear if they will make it out of the Underworld in this AU. It really depends upon how I feel the story would make the most sense and I think having the two sisters happy and accepted into their lives is all they really wanted. They were considered “monsters” on the surface so why return there? Frisk wants to watch it burn… of course… for putting her precious sister through all this.


#lore #underworld #Fellswap #AUlore

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