TSU! (Team Switch UP!) Inverted Battle: Underground Fate

Main article: The Inverted Battle: Underground Fate Wiki
For Unofficial Soundtrack Names, Please See Inverted Battle: Underground Fate OST

Warning! This article may be hard to read to some viewers, so please be considerate of the writers who are trying their best.
**Side Note! This is The Underground Version of the AU, The surface part is most likely not going to be in production... You'll have to wait and see XD**

**Side Note! The OST doesn't have any music just yet, at least not of it's own, and the names are not official yet, so please be patient, thank you.**

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## AU Information

 ### Created by

 UltraGalladivor

 ### Status

 Currently Being Rebooted (Sprites and Story)Incomplete FANDOM Story See Inverted Battle: Underground Fate Wiki

 ### Type

 Self-Insert

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## AU Information

 ### Created by

 UltraGalladivor

 ### Status

 Currently Being Rebooted (Sprites and Story)Incomplete FANDOM Story See Inverted Battle: Underground Fate Wiki

 ### Type

 Self-Insert

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TSU!Inverted Battle: Underground Fate is an AU created by UltraGalladivor there they and their friends take on the roles of Undertale characters. It also has undeveloped variations for Swap, Fell, Swapfell, SwapSwap, Storyshift, Storyswap, Dusttale, and DustSwap versions of this AU. Furthermore, the roles of the swaps for Storyswap and Storyshift are NOT the "normal" swaps; not "Chara is Sans" or similar swaps.

Long ago, two races ruled over Earth: Humans and Monsters.
One fateful day, a human attacked a crowd of monsters, igniting a War between the two races...
After a long and difficult battle, the humans barely won
Using 7 of their greatest Magicians, they sealed all of Monsterkind Underground. The 3 humans who helped the monsters in the War, were sealed away with them...
The 3 humans that were in the underground, all hid after Both of the Royal Family's Children Died...
Monsters needed 7 human souls and 7 monster souls to break the Barrier once and for all...
The King already had 7 monster souls from Boss Monsters that died in the War...
Mt. Monster November 3rd 202X
It is said that those who fall down the mountain... Would never return...
6 Humans all suffered the same fate after falling down the mountain

Genocide Run
Before The Events of The AU, A Genocide Run Was In Progress, Chara VS Sans, In The End Sans Won But... When Chara's Soul Shattered, The Timeline Glitched Out, Swapping The Characters, Now The Main Cast Of UNDERTALE Are Now Living On The Surface As Humans, While Some Humans Are Living In The Underground As Monsters...

## Characters

* Frisk - Felicity
* Flowey - Triton
* Toriel - Chara M. (NOT the canonical Chara)
* Napstablook - Troy
* Sans - UltraGalladivor (Matthew just for the sake of making it easier for people XD)
* Papyrus - Josh
* Grillby - John (A reference to Papa John's)
* Monster Kid - DJ
* Undyne - Kendall
* Gerson - Ray
* Temmie - Nigel
* Muffet - Autumn
* Catty and Bratty - Angelina and Aubrey
* Alphys - Ashlynn
* Mettaton - Charlie
* Asgore - Caleb
* Asriel - Rei (Nickname of my friend, don't ask ;-;)
* The Fallen Human - Avery
* W. D. Gaster - ??? ("Star")
* (Additional Characters)
* FatalError!Avery
* Subject 19-20-1-18 (A.K.A. Comic Star)
* (The Humans The Are ALIVE in the Underground)
* Matthew (Half Human, Half Monster)
* Josh (Half Human, Half Monster)
* Comic Star (Half Human, Half Monster)

Creator/Editor's Note: Roles are based off of Personality (If Applicable) and Are in their Correct Genders

Example: Matthew is a Boy and Sans is also a boy

Creator's Note: The Characters in the Frisk and Chara roles are both Girls in this AU

## Major Differences

Frisk (Felicity) is a girl, unlike canonical Frisk (who is genderless)

Undyne (Kendall) and Alphys (Ashlynn) in this AU are sisters instead of mutual love interests.

The maximum LOVE is 50 and maximum HP is 2400 (Due to the set up being far longer than the normal Undertale map) Judgmental Vengeance or JV does 4 times as much damage as damage as normal KR would do as a result of high HP

Sans (UltraGalladivor) is not as lazy as regular Sans; he is more energetic and helps the human escape puzzles, but also helps design real, challenging puzzles which Papyrus (Josh) likes, but is still a lazybones most of the time regardless.

Papyrus (Josh) is more persistent at trying to capture the human (Avery) (considering the area is longer than Snowdin) and prepares 26 puzzles (Sans adds puzzles so there is a total of 50 puzzles before reaching town). (Note, Half of these puzzles are extremely difficult, the rest are actually fairly easy)

All vendors accept the items the human sells (with different sell values.)

There are 30 NPCs but only half of them are vendors.

Undyne is more aggressive towards the human when she hunts them down, but kinder towards after they help her.

Sans and Papyrus will follow the human if they ask Papyrus after his date, and Undyne will help to handle Alphys after the hangout.

If a Pacifist Run was failed specifically by not meeting the requirements (Not by killing), you have the option to go back to what you did wrong, regardless if you saved over it or not.

Matthew also mentions this in his judgement if you haven't met the requirements for the True Pacifist run, explaining who you need to go to and where to go. So it's pretty important to listen to his judgement.

Matthew's NORMAL fight is 4 Phases long, which is twice as long as normal Sans.

There are several funny cut scenes, Mainly if you were to choose to wear your role-playing outfit. It also depends on how many Main Characters follow you.

Matthew teleports into his position upon entering Judgement Corridor if you choose to let him follow you. Josh teleports back home, waiting for the hang out upon entering New Home.

## Character Info + Descriptions

Felicity is a girl in this AU. She Wears A Red Shirt with a Pink Sweatshirt, Pink Shorts, and Black shoes. She had Pink eyes in this AU. She generally is a pacifist that will refuse to hurt anybody. She is similar to Inverted Fate Frisk, she does wear different clothing in different areas. She also can speak and has several expressions. She normally has a happy expression after being healed by Chara.

Triton doesn't look too different from normal Flowey except for the petals, which are now purple instead of yellow. He also uses red magic, but not until the Omega Triton fight. He (obviously) holds Determination, but not too much. His "Friendliness Pellets" are Orange, but not the Orange attacks you move through.

Troy is a very famous DJ that had died and became a ghost, but nobody knew that he was a ghost, so nobody believe that he is Troy, He is Charlie's cousin (in the AU) but Charlie was the 1st idol (Charlie doesn't know he's technically alive until after Rei's fight.)

Chara M., The Former Queen of the Underground, is still a goat like Toriel, except wearing a blue robe with a red Delta Rune. She also can use red magic. She holds a fair amount of Determination, but it fails her in Genocide. (EXTREMELY IMPORTANT Side Note, Red Magic varies in this AU, Matthew and Josh's Red Magic takes away your max HP for the duration of the battle and can only be brought back during that battle with items you get from them, while Chara's Red magic is just normal attacks but double the power) The Main change is that she WILL follow you outside of the Ruined Area if you ask her by going upstairs after the fight, she will also heal you in battle in all fights. You get a very funny cut scene if you do the beginning of SnowedOut with her following you outside.

UltraGalladivor, (aka Matthew as he'd like to be called) has many differences to canon. He can use all types of magic, but mostly uses blue, orange, and red magic with the yellow, blue, and orange SOUL Modes but he can put you to any soul mode if he wanted to. He holds Determination, but doesn't melt when killed. He also has a battle body similar to Blueberry Sans, and wears it when he and Josh are fought. His fight has 11 phases (4 in normal difficulty), each harder than the last. He has the most Determination (apart from Avery) making all his stats rise during later phases in Genocide. He and Josh also have the most physical matter of all monsters. Unlike Most AU's, He DOES have a pacifist fight, but is pretty tough to beat regardless, having a mastery of all soul modes to his advantage, but instantly spares you if your HP is drops below 5. He also has a crush on somebody that can easily be figured out when you hang out with him and Josh after Josh's fight. (Note, Who it is will NOT be told until the game is released) (Another side note, Josh, Kendall, and Matthew will ALL bleed when hit at a certain point during those battles) He is already best friends with Felicity, knowing them before falling into the underground. Seemingly enough, he is also best friends with Kendall. He does call Felicity out throughout SnowedOut/SunnyOut. (Note, he wears this battle body during ALL hangout sessions regardless, cause he wants to match his "brother".)

Josh has a similar amount of change. Josh wears a jacket at times during puzzles. He also knows all the same magic Matthew does. He is EXTREMELY obsessed with Tacos, Pizza, and Spaghetti, using these food items as 5 of his traps. (At least you can pick them up, reheat them, and eat them later XD) He can also heal the protagonist in battle (with the exception of Kendall's fight, due to a fear of her). He wants to join the Heroic Royal Guard. Like normal Papyrus, losing to him goes only to Jail, but involves a random puzzle to escape. Unlike in Undertale, If he is treated kindly, and solve all puzzles without assistance, Josh's hangout will be unlocked. The hangout is mandatory on both Pacifist and Neutral Runs. His Disbelief fight has 13 Phases at max, which can be VERY tiring (Save points are given after certain Phases). He has the same amount of Determination as Kendall, third behind Matthew and the protagonist, making his fight harder. He is extremely scared of her when she is fighting, but is good friends with her outside of battle. Josh, Like Matthew, Also calls Felicity by her name. Calling her "Human" similar to how Papyrus calls Frisk "Human" in the comics. He will give you a Rainbow Scarf and Rainbow Shield that can be used as Armor and a Weapon, but these are Storyshift Asriel Based Colors, so don't assume things. However, Josh is COMPLETELY UNAWARE that there are humans living in their house, since they hide out in Matthew's locked room during the day, and they hide in the lab at night. He is also the Protector of SnowedOut/SunnyOut. (Note his disbelief fight has checkpoints after Phase 4, 7, and 11.) He does get into the Royal Guard after the Hangout with Kendall, and can be seen with him wearing his Royal Guard Armor for the rest of the playthrough unless you ask him to change back.

John is Grillby in this AU, which is a reference to Papa Johns, as Papa Johns is surprisingly the name of the Restaurant in this AU. Matthew AND Josh go there quite often (Matthew brings the 3 humans pizza 50% of the time, the rest of the time its what he can cook while Josh is asleep without waking him up.) But unlike normal Papa Johns, you can actually sit down inside and eat pizza and they serve pasta and drinks.

DJ is basicallust like the Monster Kid from UT, but in this AU, he is Best Friends with the Skelebros (Matthew and Josh) admires Kendall (She is his biggest idol, Just like Undyne is MK's biggest Idol)

Ray is Gerson in this AU. He is one of the few remaining survivors of The Monster-Human War. He also sells you some decent stuff, selling good healing items and decent weapons and armor. He looks like he is 75, but he is actually 1000 years old.

Nigel is pretty much similar to Temmie in almost every way except the appearance difference and it's not an in-game representation of a life person (i couldn't explain this right, what I meant to say is, like where The Annoying Dog represents Toby Fox, and Temmie represents Temmie Chang) He sells Nitro Armor, which unlike Temmie Armor, doesn't give the boosted effects, but is 30 Defense.

Kendall, the Fearless Captain of The Heroic Royal Guard, is more aggressive than normal Undyne. She uses swords and shields and can use green, yellow, and green/yellow SOUL Modes. She won't let Josh join the Heroic Royal Guard for how nice he is and how he would "Get ripped into little, smiling shreds", but lets him join in at the lowest rank shortly after the hangout. Kendall has the same amount of Determination as Josh has. Josh, as enthusiastic as he is, accepts and trains under her.

Ashlynn, The Royal Scientist, has built a huge lab in Fire Cove. She watches over the human through her cameras. She also helps her through Fire Cove. Hunter assists Ashlynn in her experiments. She wears a fuzzy, blue blanket over pajamas and pink bunny slippers. She holds Determination as well, but not as much as the rest. She uses blue magic and Pink (Similar to the Cyan Mechanic from Storyswap Color) and Blue Modes. She IS fought in Genocide, but she hides in the beginning,

Charlie, The LITERAL Star of the Underground, fights the protagonist several times on Pacifist. He initially looks similar to Mettaton and Napstaton in appearance, except he's blue with a DJ set and red headphones. Charlie NIGHT, unlike Mettaton NEO, has a proper fight and ANOTHER form after it. His Determination is fairly strong, but not as strong as Josh or Matthew. He uses blue, orange, and white magic and yellow and blue SOUL Modes. He fights along side of Ashlynn in Genocide.

Autumn is Muffet in this AU. But unlike Muffet, she looks more human, but isn't actually human. Instead of spiders... she uses a variety of Animals for her attacks. Like the Snakey Bake Sale (Pun VERY MUCH Intended) in the Ruined Arena. The Fight works similarly to Muffet's when it comes to soul modes, otherwise the battle is very much different. Animal life does exist in the Underground.

Angelina and Aubrey act a lot differently than their Undertale Counterparts. They look more human, even though not actually being human, the items they sell you are very good compared to Undertale. This Junk food has an ACTUAL name and heals 50 HP.

Caleb, The King of the Underground, holds a ton of determination, but falls short of Josh. He oversees all the Underground, having access to Ashlynn's cameras (which even permeate the castle). He is a very peaceful ruler, and unlike Asgore, frequently visits all the Underground (Mainly SnowedOut when it's not snowing, so SunnyOut basically). Like Asgore, he regrets his "all humans that fall in the Underground shall perish" law, and every human he kills by hand, or ANY human for that matter, he stays in his castle upset. Matthew is his best friend, which is why he visits SunnyOut so often, and vise versa with Matthew. He uses red, orange, and blue magic. He is also very good friends with Matthew, but nobody but himm knows that.

Seth, The Prince of The Underground, was a very kindhearted child. Despite having half a human's amount of Determination, his doesn't surpass Josh's or Kendall's DT (explained next sentence). He doesn't have attacks before the story (not including absorbing the soul) due to still being a minor when he was killed by the humans. His "Hyperdeath Fusion" form uses Shocking Blasters, The Prince's Swords, Fire, Blades of Determination, and Hyperdeath Blaster. You CAN save him, by bringing him back to life. If you have Any healing items given to you by the King. these items can be used to bring him back to life, if you used up these free items, you have to get the Chocolate bar from Matthew at his house. Avery HAS to be saved 1st, as Triton will not appear unless she is present.

Avery **(formally Ari, but due to my past with her, I had... lots of problems thinking about that again, I decided to make Avery as Chara rather than Ari)** , The adopted sibling to Rei, was a kind human who was tortured on the surface. She jumped down the mountain to attempt suicide but failed. The royal family took her in. She lived with them for about 9 months until, one day, she had a plan to free all monsters. She poisoned herself with raw food. Rei absorbed her soul, and then he went to the surface, only for him to end up going back to the underground and perishing from human attacks. She was awoken from death by Avery, and now follows her everywhere she goes. She can take control of Avery sometimes on the Pacifist route (mainly when it comes to anything related to Chocolate, Anime, or roleplaying.) She IS the narrator on all routes, On the Pacifist Route, her dialogue is Green Text, Yellow on Neutral, and Dark Red/Orange or both on Genocide. She CAN be saved if you go back to the Ruined Area, however, you have to sacrifice half of your soul to do so, but this 2nd of 3 things needed to do to get a TRUE happy ending, as well as the extra gameplay.

"Star" is W. D. Gaster in this AU, reason of this because he is unfortunately the guy I have the least information about. Everybody else is known in some way, but Star nobody has info on. Matthew and Josh can still see him even though he was erased from existence. Matthew would talk quite often with him when nobody else is around. Felicity later on is able to see him. You CAN save him as well, if you have obtained the key to Matthew and Josh's Lab (by doing BOTH hangouts with Josh).

## Additional Characters

Subject 19-20-1-18 (Comic Star) Is the Brother of Matthew and Josh. He is he is an experiment like Matthew and Josh, they were all used by human remains, from their original bodies which were conveniently buried in the mountain they were trapped in. The all became brothers after they were revived with a monster soul.

## Areas

All areas have been changed.

* Ruins - Ruined Arena. Ruined Arena used to be an Underground arena where people could have fun and watch movies in the day and people could wrestle and fight in the night. It's not abandoned like the Ruins are (the Ruins aren't abandoned either, but still pretty underpopulated)- It was used to the point where it became worn out.
* Snowdin - SnowedOut. SnowedOut is a snowy city where it snows a lot, but not infinitely like Snowdin; the town is called SunnyOut if the snow is not around.
* Waterfall - Crystal Cove. Crystal Cove is special, because unlike Snowdin's neighboring of Waterfall, SnowedOut/SunnyOut is *inside* Crystal Cove. It acts similar to Hotland/the CORE, having 2 separate encounter rates.
* Hotland - Fire Cove. Fire Cove isn't too different from Hotland. The weather is fairly random and occasionally even snows. The Lab is much larger than normal. The area is also twice as long as Hotland and the CORE combined.
* CORE - Main Central Power Control. This area isn't too different from the CORE. It's thrice as long as The normal CORE, but smaller than Fire Cove. There is also a town here called FiredAround between Fire Cove and Main Central Power Control. Main Central Power Control is the main power source (The Real Lair being backup power for the entire Underground system). This also has a separate encounter rate from Fire Cove.
* New Home - True Home. True Home is almost the same except the color is blue.
* Last Corridor/Judgement Hall - Final Hall/Judgement Corridor. Very different from Judgement Hall. There are no pillars in the Corridor, the Hall is illuminated Green and Red in the Pacifist and Neutral Run, and Dark Purple (Like Fallen Stars and Swapfell) and Dark Red on Genocide, and Pure Dark Red on Higher Difficulty Genocide.

## Items

For the Items, see Inverted Battle: Underground Fate Items

## OST

For the soundrack, see Inverted Battle: Underground Fate OST.

## Stats

Monster LOVE is calculated differently from human LOVE. ATK and DEF are formatted `*[Check information]* (*[Actual information]*)`

But if the split area's are combined as one area, if a Genocide run has been started, you should be up by 10 levels every time (Excluding the final area, you will be level 45 before fighting Matthew)

This part is the EXP chart, it's a work in progress and will be updated when I figure out what would be fair

(Note, All EXP is insanely high due to more an excessive amount of encounters, with Extremely INSANE EXP per kill, So after LV 25, Leveling up Starting at 25 and ending at 34, always requires 20,000,000, excluding the Auto setting EXP, the rest of the levels only require 10,000,000 EXP.

Killing Chara regardless brings you to LV 10, Killing Josh sets you to LV 20, Killing Kendall sets you to LV 30, Killing The Final Encounter (Other Than The Final Bosses of the area) sets your LV to 40, Killing Ashlynn and Hunter (Without the secret bosses) sets your LV to 45, but if all secret bosses were killed, you get set to LV 49, and Killing Matthew (Which is EXTREMELY difficult even on normal mode) you set set to LV 50.

Getting to LV 100 is impossible for now, due to there being no planning on how to plan the surface part of the game yet, but at some point there will be aftergame experiences that Undertale didn't have, there will be extra gameplay for those who want it, a Post-Pacifist, Post-Neutral, and Post-Genocide Extra Playthrough eventually.

## Gallery

\*Keep in mind that Matthew's outfit DOES change in hard mode