This post is a summary of all the evidence that the person speaking in the “vessel creation” portion of Deltarune, and by extension the Game Over sequence, is W.D. Gaster.



1. Connection to the Twitter

For those that don’t know, on October 30th, 2018, the day before Deltarune came out, the official Undertale Twitter changed its icon and display name, and tweeted a number of cryptic tweets, which we now know to be teasing Deltarune.

As you can see, the tweets are clearly written in the same voice as the person in the intro. This is a very unique voice, so it’s extremely unlikely it would be anyone else.

This gives us a hint to who the speaker is - look at the display name. It’s “██████”. If you can’t tell, that’s exactly six characters of black “censored” boxes - the exact number of letters you need to spell “Gaster”.

2. References to Entry Number 17

Undertale’s hidden “Entry Number 17” is one of the more well-known Gaster Things. But in case you don’t know about it, Entry 17 is a section of text, in the form of a True Lab entry, written in Wingdings font, and only accessible by editing the game’s files. Here is a video. https://www.youtube.com/watch?v=0jfHh88p5hk

Translated from Wingdings into plain English, it reads:

ENTRY NUMBER SEVENTEEN DARK DARKER YET DARKER THE DARKNESS KEEPS GROWING THE SHADOWS CUTTING DEEPER PHOTON READINGS NEGATIVE THIS NEXT EXPERIMENT SEEMS VERY VERY INTERESTING … WHAT DO YOU TWO THINK

Of note is the part that I have bolded. The phrase “VERY VERY INTERESTING” seems to be a… catchphrase? of Gaster’s. It’s used in the tweets in the lead up to Deltarune to make a very clear callback to Entry 17.

In addition, another possible reference to the line is in the save menu screen of Deltarune before you clear the game. If you don’t know, the main menu is different depending on if you’ve already cleared Chapter 1 once before, or if you haven’t cleared it yet. If you haven’t yet, the save menu will not only appear different, but the dialogue for copying and erasing save files will be different as well.

Of interest is a line of dialogue that only occurs when you delete 10 or more save files, then go to delete another one, then back out when asked if you want to “TRULY ERASE IT”. If you do this, the text will read, “VERY INTERESTING.”

Here is a video: https://www.youtube.com/watch?v=GRnliRKGMBM

3. “mus_smile” in Deltarune

Speaking of Entry 17, You may have noticed the creepy “music” playing when it is being displayed. This piece of audio is titled “mus_smile” in the files. Interestingly, it appears in Deltarune not once, but twice.

The first is when you try to make a phone call while in the dark world. Any game music that was playing will stop, and instead “mus_smile” will play, and the narration says that the cell phone “doesn’t seem to be working”. Video: https://www.youtube.com/watch?v=P7FuP_AkbRU

The second is, of all places, in Hometown during the epilogue. Specifically, when you’re near the bunker south of town. If you’re close enough to it, a very slowed down version of “mus_smile” will play. Video showing the sound at both original speed and sped up: https://www.youtube.com/watch?v=aPQYXiUEpPk

4. Typer values and the number “666”

This one requires a bit of explaining on how Undertale and Deltarune function. Each line of dialogue, in both Undertale in Deltarune, relies on what is called a “typer” value. Basically, all the information about the text - the size, the font, what sound the text blips make - are all stored in this “typer” value. Usually, each character has a specific typer value associated with them, sometimes several. When a character says a line of dialogue, the game uses this typer value to determine how the text will appear.

And, again, we return to Entry 17.

You probably know that Gaster is heavily associated with sixes. In Undertale, his unused battle stats are all sixes - for example, his attack and defense are both “66666”. The “fun” value needed to encounter the “mysteryman”, commonly believed to be Gaster, is 66, and the fun values for all of the “Gaster followers” are in the 60s as well.

You may have guessed it by now - The typer value used for Entry 17 is “666”. This is definitely intentional, as the highest typer value below that is “111″.

So, then, what’s typer value “666” used for in Deltarune?

Why, it’s the intro sequence. Interesting. (Except the “No one can choose who they are in this world” bit - that part uses typer value “2”, which could provide further evidence that it’s a different person speaking.)

Similarly, typer value “667” is used for the Game Over sequence.

This, in combination with “VERY VERY INTERESTING”, seems to make it very clear that the speaker in Entry 17 and the mysterious speaker in the “vessel creation” part of Deltarune are the same person. Although you need knowledge of the game’s files to find this particular piece of evidence, you also need that to find Entry 17, which is a huge part of the Gaster Lore™.

5. What the “vessel creation” is actually called in the files

In Deltarune’s files, the “vessel creation” sequence is referred to as “GONERMAKER”.

This is significant, because the term “Goner” is tied to Gaster.

Gaster is pretty clearly linked with the “grey NPCs” in Undertale. Two of these grey NPCs are explicitly referred to as “goner” in the game files:

“spr_mkid_goner”



“spr_clam_goner”



The latter is the “goner” form of Clam Girl, who speaks of Suzy, and, in the Nintendo Switch version of Undertale, which came out less than two months before Deltarune’s release, claimed that the time we will meet her is “fast approaching” as she turns into her “goner” form. This was possibly foreshadowing Deltarune’s release. (I say “possibly” because we don’t actually meet “Suzy” in Deltarune, but “Susie”.)

In any case, these so-called “Goners” are almost certainly linked to Gaster in some way. We don’t know exactly how, but the fact that the intro is called “Goner Maker” is almost certainly very significant to the story.

6. The music during the “Goner Maker” sequence, and its title

Undertale has a hidden sound test which does not actually include songs from the game, but notably, includes a song titled “Gaster’s Theme”. In the game’s files, this song is called “mus_him”.

And, as you can see on the bandcamp page for Deltarune’s soundtrack… The title of the song that plays during the “Goner Maker” sequence is “ANOTHER HIM”. In addition, the song seems to use “Gaster’s Theme” as part of the melody, as does “Darkness Falls”, the game over theme.

7. Hidden messages on the Deltarune website

Way before Deltarune was revealed, the website still existed. But it looked a bit different.

Luckily, we have archives on the wayback machine, so we can see what the website looked like in the past.

August 17, 2016:

http://web.archive.org/web/20160817183540/http://www.deltarune.com/

The page appears to be completely blank. However, in the top left corner there is an image, titled “him.png”. when brightened, it reveals a message written in Wingdings:

It reads,

THREE HEROES APPEARED TO BANISH THE ANGELS HEAVEN

Which, as we now know, is a quote from the Legend in Deltarune that Ralsei tells Kris and Susie.

However, there is also an archive of the link to the image itself. And it turns out this image was different at some point.

December 9, 2015:

https://web.archive.org/web/20151209013205/http://www.deltarune.com/him.png

When brightened, the image once again reveals Wingdings, this time reading:

THIS NEXT EXPERIMENT SEEMS VERY VERY INTERESTING

Which, you may remember from earlier, is a direct quote from Entry 17.

This, once again, strengthens the connection between Gaster and Deltarune.





These are all the major pieces of evidence that Gaster is speaker in the intro. Of course, we can’t 100% prove it just yet. But there’s no good reason to deny it. With so much of the evidence clearly pointing to Gaster, at this point Toby going “haha actually it was someone else the whole time” would just be bad writing. And Toby’s good at writing! I really don’t think he’d pull a pointless, unnecessary “plot twist” like that. So it’s very, very safe to say that this person is Gaster.