About the AT

A written AT (alternate timeline) created by NovaHeart8 and SwapTale10.

The description is as follows: "An Undertale AT (alternate timeline) that takes place in a timeline in which everything, overall, goes right. The game of Undertale but with emotional twists. Most of the dialogue, and all of the characters, belong to Toby Fox. Major spoilers for the game. I will let you know when triggers come up. Foolishness makes a promise, but wisdom keeps it."

(Everything going right is a matter of opinion, of course.)

Frans does become canon in this AT, but this will not take place until much later.

The author is NovaHeart8, editor is SwapTale10. Though according to NovaHeart8, "not much needs to be done (edited) by the time I finish [each] chapter."

AT Synopsis*

After multiple resets, Frisk collects pieces of Gaster's soul, which combine to bring him back to life. Once this happens, Frisk frees Gaster from the Void. Frisk returns to the Surface, then takes their own life to defeat Chara, who would have otherwise possessed them due to a deal they made at the end of a Genocide run. They reset just as they die, forever trapping Chara in their fallen body, and putting everything back in its place. However, Gaster remains alive, and a new Frisk enters the Underground.

This story puts an emphasis on the power of promises and trust, especially the promise Frisk made to their late mother that they would stay determined and fulfill their dream of exploring the world, helping others in the process.

As Frisk travels through the Underground, they realize that the impact of their choices- and their words- is far greater than they could have ever imagined.

*: This synopsis will be updated at a later date.



Main Protagonist:


Secondary Protagonists:





Major Characters:

With a Point of View*:







Without a Point of View:

-Gaster Follower #1**

-Gaster Follower #2**

-Gaster Follower #3**


Other Characters:

Any other character in Undertale is included in this story also. This includes Goner Kid.

Additional Information About Characters:

*: All P.O.V.s are third-person limited.

**: The Gaster Followers have been given names depending on what character they are based off of or their character traits. Gaster Follower #1 is named "Ficus" since his sprite closely resembles that of the Ficus Licker character met in the restaurant at MTT Resort. Gaster Follower #2 is named "Rhyme" since he speaks in rhyming couplets. Gaster Follower #3 is named "Smile" since his sprite is a smiling head.

Point of View varies. The protagonists and antagonist all have their Point of Views, but the major characters come in one at a time. Those without a Point of View do not arrive until much later in the story.

The ages of the characters are as follows:

-Frisk is 15

-Sans is 19

-Papyrus is 18

-Gaster is 37*

-Flowey/Asriel is 20

-Toriel is 50

-Asgore is 51

-Undyne and Alphys are 24

Ages will be added as characters are introduced, and are subject to change. However, they most likely will not.

The ages listed are the ages of the monsters in human years. Monsters age differently than humans. For example, Asgore is at least 100, but in human years, he is only 51.

*: Gaster stopped aging when he was in the void, since he was stuck in time.

Additional Information

This story is currently in-progress, on both and

SwapTale10 is currently uploading chapters to DeviantArt.


-PromiseTale was once a roleplay.

-This AT was inspired by GlitchTale since in GlitchTale, "everyone important was dying".

-Although Frisk is a "they" in this AT as they are in canon, they are much more feminine.

-Frisk wears faded grey pants in this story rather than shorts as in canon.

-Gaster is very kind in PromiseTale since he's made into an abusive villain in other AUs (according to what NovaHeart8 has seen).

-The author said that she would draw for the AT if she had any talent.

-All characters (except Napstablook) have an affinity for acting, though never mentioned in the story.

-The author makes an appearance in the second-to-last chapter. The notebook she's writing is passed on to Frisk at the end of the epilogue.

*:This list will be updated as the AT goes on.

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