UnderVanquish
- Reads 3,029
- Votes 404
- Parts 200
MatureOngoing24h 17m
Last published Sun, Sep 7, 2025
The story officially begins when Toriel dies in her universe mysteriously. Gaster with his allies show up and take her soul remains back to his lab to save her life. Toriel then had DETERMINATION injected into her. Most of the DETERMINATION was collected from humans in multiple different universes. Gaster created the perfect solution to end RESETs and genocide routes that plague The Multiverse. A new kind of boss monster with the ability to utilize the power of the savestar.
With Toriel at his side as his daughter, he embarks on his quest to bring peace and balance to The Multiverse. However the savestar becomes corrupt, doing more than its intended function.
If the RESET function is over-worked, it will erase a universe. The more universes that are gone, the more The Multiverse dies. They explore every universe they're able to, attempting to fix the savestar and rid the ability to RESET, helping others and themselves.
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Note: This AU has themes such as Suicide, frequent swearing, mentions of needles and more medical equipment. Be careful upon reading incase you are sensitive to these topics!
Also moments in the story of characters smoking and mentions of Alcohol.
Note: All 7 of the finished Chapters are published.
Chapter 8 will start in 2026.
The AU is still in progress.
Enjoy.
UnderVanquish has two creators: SoulerClash and C!rquette.
Co-Writers: Capt.Gunscar, Eversius, JK, Darkswaver, Hollow,Marble and Thegreatjade_yeet.
UnderVanquish-Comic Creators: SoulerClash,Hollow and Marble.
UnderVanquish-Game Creator: SoulerClash.
Update: March 2026/Comic is not going to happen for a while but there is an UnderVanquish game in progress and it will be massive, same amount of chapters as the fanfic and each chapter will be a game. Chapter 0 which is prologue is getting new lore. Chapter 8 is going to be delayed. I will enter new content sometime this year once I have enough content done.
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An Undertale Story: As most know, the soul of Justice died trying to escape the monsters in Mt. Ebott, I'm here to raise the question, what if they didn't fall at their time and die? This story provides one of the answers of what COULD happen if Justice never fell alone, but with Frisk, a child who holds the soul of Determination and is the MC of Undertale. The reason why I chose Justice is because they would be a challenge for Frisk; Frisk would try to stop Justice from killing. The soul of Justice will be known as David Mason, a 17 year old white male high schooler, the events that will occur will most likely not be the same. *I do not own anything, all credit goes to Toby Fox for making Undertale Warning: Blood, harsh language, and disturbing imagery included. Mature audiences only. Milestones: 100 reads - 4/13/19 200 reads - 5/3/19 300 reads - 7/5/19 400 reads - 10/20/19
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