Okay so here's the deal, this AU goes by two names for reasons that have yet to be revealed in the fanfiction I'm writing that is centered around it. But the jist of it is that the name "Bosstale" refers to the increased number of individuals of the boss monster species in this AU. The name "Undertrash" is used in that many "fan-made" characters make this AU their home.
Said fanfiction's prologue is found here:
*Insert a Profound Title Here* PrologueIn the overwhelming darkness of the Void, a cat floats alone clutching something to her chest fur. The tip of her tail twitches in fear. “I…I shouldn’t be doing this...I fear that they may try to stop me.” The cat had every reason to be afraid, for what she was holding so closely were two parts of two souls. One human. One monster. She had gathered these fragments from different points in different timelines from two individuals who have had some influence over the infinite number of timelines in the seemingly infinite universes. Her intention, to merge these soul fragments together to create a living being from souls that should have vanished in their respective times. This would be her greatest sin. The cat took a few shaky breaths before moving the soul fragments closer and closer together. The air felt so tense that it seemed as though the fabric of existence
Also I wanted to make a note on how I view the multiverse of Undertale which can be viewed here:
***NOTE: THIS IS A HUGE WORK IN PROGRESS. MORE INFORMATION WILL BE AVAILABLE THE FURTHER I GET INTO THE FANFICTION!***
Major characters from the original Undertale are replaced by boss monsters:
-Undyne is eventually replaced by the character Zauviel who becomes head of the royal guard after her passing.
-Asgore is eventually replaced by the character Lee who previously had a Papyrus-esque role in his youth. He is the current king of monsters and is the representative of the AU in whatever council there is for AUs.
-Sans and Alphys are eventually replaced by the mysterious character Subject 0-17.
Other replacements to make note of:
-The role of Papyrus is taken over by the character Erroll.
-The role of Sans was originally held by Chans, but was cast out into the Void to escape the persecution of other sanses of the multiverse. Lee has also taken over Chans's role.
Anatomical differences in (some) Boss Monsters:
This AU can have a neutral, a pacifist, and a genocide ending. The final boss however remains the same. This tragic hero is the skeleton-human hybrid Chans rather than Asriel. Chans's backstory will play out in the fanfiction. But at the end of their story, they lie just outside the AU and serve as a "guardian angel" figure protecting the AU from the threats of other AUs in the multiverse. However, when sanses of each AU have a meeting it is Lee that goes as the representative of Bosstale/Undertrash rather than Chans as the sanses of the multiverse believe Chans to be dead or lost in the Void like Gaster. Your actions as the player affect the fate of the AU and Chans.
With respect to Chans's appearances:
Neutral ending: While Chans does not make a formal appearance in the neutral ending, after the player defeats Lee they are presented with the boss monster's SOUL. Before the player is able to take the SOUL, a child version of Chans appears and snatches the SOUL away and absorbs it along with the other human souls, becoming a beast that will then fight the player. The player then defeats the creature and is allowed to proceed to either the end of the game or a chance to proceed to the pacifist ending.
Pacifist Ending: The battle starts off as a neutral battle would with a child form of Chans appearing; however, after a new stream of dialogue Chans assumes this form (leftleftthegecko.deviantart.co…) rather than absorbing Lee's soul and becoming the beast from the neutral ending. After some more dialogue where Chans seems to become increasingly irritated with the player, they assume this form(sta.sh/027wxk0zy2yp) for the remainder of the battle to the salvation phase where the player is able to SAVE Chans.
Genocide Ending: This ending is composed of two battles. There is the "sans fight" phase where you have to fight the "sans" of this AU: Subject 0-17. This fight is at the same level, if not more difficult than the Sans battle of the traditional Undertale. After finally defeating Subject 0-17, the player proceeds to the battle with Lee and instantly does away with the boss monster. A child version of Chans will appear to the player and fight them. Chans has a genocide-exclusive attack: Red Blaster. It's kinda like a Gaster Blaster, but it's red. And it's more of like a last resort than anything as it's an insta-kill. But they only use it in the genocide timeline. To see a visual of the attack see here: sta.sh/07mdqietf7o. However, it is impossible to win a genocide run due to the DETERMINATION in the human soul fragment that comprises Chans's soul, when you "kill" Chans the game crashes.
Other significant alterations to the original Undertale are as follows:
-Asgore ages while Toriel does not.
-Toriel meets her end long before the human arrives
-Asgore takes Toriel's role as caretaker of the RUINS
-Alphys does not get with Undyne, she meets her end long before the human arrives. Why she doesn't get with Undyne will be revealed later on in a one-shot.
-Undyne eventually meets her end in the Great Rebellion long before the human arrives.
-Mad Dummy meets their end before the Great Rebellion.
-It is unknown whether or not Alphys created Flowey or not, but we could assume she does not.
-Skelebros do not naturally occur in the AU. Skeletons from other AUs invade Bosstale but are driven out by Lee and the remaining monsters as well as skeletons who do not wish to have anything to do with them (the skeletons) such as Erroll in what is known as the Great Rebellion. THE AU DID NOT ORIGINALLY HAVE AN AU-EXLCUSIVE SANS AND PAPYRUS AND WILL NEVER HAVE AN AU-EXLCUSIVE SANS AND PAPYRUS.
To sum a bunch of stuff up:
Major Characters from Undertale that are present in Bosstale/Undertrash when the human arrives:
Major Characters from Undertale that are deceased/missing and are referenced in Bosstale/Undertrash when the human arrives:
Major Characters omitted from the original Undertale cast:
And if you get butthurt, oh well. The purpose of an AU is more of a "what if" scenario...so...yeah. Also if you have an OC that you'd like to be a part of the AU, shoot me a note with a ref and I'll consider it (more often than not I'll say yes x3)