Undertale: Monochromasis

A blog dedicated to the story of Monochrome!Sans. * Created and owned by Dragon8er.

[ut-monochromasis]

Welcome, dear reader, to Undertale: Monochromasis!

Important Links:

Blog Archive Page Main Story Masterpost Character Bio Masterpost Ask Chrono The Official Discord Server

Ask Status: Closed

Askable Characters:

Mono

UT66

Silky

Spiderpants

The Gaster Gang

Rules for Asking:

No NSFW.

Refrain from being too 4th wall-breaky.

Refrain from roleplaying too much.

No shitposting. This is an ask blog. If you're gonna shitpost, at least have it be in the form of a question.

Below the cut is a TLDR.

What is Undertale: Monochromasis?

Undertale: Monochromasis is an Undertale AU detailing the story of Monochrome!Sans, as he and a group of Gasters navigate life before and after an attack by a nefarious eldritch entity.

Pages of the story are posted every Friday at 12:00 PM CST eventually *cries*.

You can also find them on my DeviantArt, or Twitter account (note: future pages will no longer be posted to Twitter, for obvious reasons), if Tumblr’s not your jam.

Who is Monochrome!Sans?

Monochrome!Sans, AKA Mono!Sans, Monochrome, or just Mono, used to be a regular Undertale Sans. Until one day, a mysterious entity known as The Noir began wreaking havoc across the Multiverse, changing Mono’s life forever.

What was his life like before?

What will it be like now?

What will it be like…in the future?

That’s for me to know, and you to find out!

[ut-monochromasis]

Undertale: Monochromasis | Chapter 1 - Page 17

Next (coming soon hopefully) Previous

Another page!

Sorry this one took longer than expected, myself and Shiggy got kinda busy last month. And in the case of Shiggy, sick, too.

Which reminds me.

Just like the last page, @shigg315 helped me out with this one. He helped with the composition and paneling, and colored the backgrounds and did compositing.

This page was pretty fun to figure out. Got more room to breath than the last page which had an establishing shot and a slightly slower pace.

And with this page, we've officially remade the only page that was released after the first scene of Chapter 1 lol. But hey, that just means that all the pages from here on will be brand-new stuff.

I hope you all look forward to that!

Until then, this has been Dragon8er, and I will see you all Drago-l8er!

[ut-monochromasis]

Happy Pride Month, everybody!!

Finally. We know what that means!

You know I had to make one of these this year, it's tradition. That being said, I had a funny idea for this year's, so here you go lol. (Featuring UT61, created by @q--cool.)

Happy Pride Month!

As a wise skeleton once said: "Be gay, do crime."

We're still hard at work on the next page of Monochromasis btw, don't worry. Just been a rather busy past month.

But hopefully we'll have more free time this month. We'll see.

Until then though. This has been Dragon8er, and I will see you all Drago-l8er!

[ut-monochromasis]

Undertale: Monochromasis | Chapter 1 - Page 16

Next Previous

Hey guys, Dragon8er here!

A NEW PAGE OF UNDERTALE: MONOCHROMASIS!!!

No but legit it's been nearly 2 years.

And I want to go ahead and apologize for that. The reasons are pretty straightforward. After I made the Prologue and the first 16 pages of Chapter 1 back in 2024, basically all by myself, I had completely burned myself out.

(Speaking of which, if you wanna check out the older version of Page 16, you can do so here.)

And all throughout 2025, I just never managed to work up the motivation to get back to it. Between that and me just being so busy throughout the year, plans just...fell through.

As for why it took so long to upload one this year...I talked about that back on Cinco de Mono. But to summarize: myself and Shiggy were busy.

Which reminds me...

@shigg315!!! He helped me greatly with this page!

He helped me with composition and layouts, did all the backgrounds and the compositing, and even some cleanup. He even gave me some helpful pointers for the shading, which I did for the characters.

So yeah, massive shoutouts to him! This page probably wouldn't exist right now without him. And it certainly wouldn't look anywhere near as good.

I can't promise that the next page will be next week, but we are hard at work on it, and we will try to release it within the month.

Until then, this has been Dragon8er, (oh how I missed this) and I will see you all Drago-l8er!!!

[ut-monochromasis]

The Ask Blog is now closed again!

I was planning to go for longer, but I didn't get enough asks to justify that lol. So the Ask Blog is going on hiatus again.

Will it be a half year until we return? Idk maybe lol.

But yeah.

Happy Birthday, Mono...

Drago-l8er!

[ut-monochromasis]

Damn.

Them's the breaks.

If you wanna send in an ask, please remember to follow the rules provided on the pinned post.

[ut-monochromasis]

Hey Mono! It's been a while! How have you and the Gaster Gang been since we've last seen you? How has the OT been as well? I'm assuming it's been treating you well?

That's just life, really.

Sometimes we all need a vacation, eh?

If you wanna send in an ask, please remember to follow the rules provided on the pinned post.

[q--cool]

happy cinco de mono!! ft. monochrome!sans (mono) by @dragon8er (@ut-monochromasis )

[ut-monochromasis]

It's so adorable...

[ut-monochromasis]

spiderpant, do the thing, thanks.

What thing?

If you wanna send in an ask, please remember to follow the rules provided on the pinned post.

[ut-monochromasis]

So, Mono, do you have monochromatic color blindness/monochromacy? (Meaning that you can only see things in Black and White)

Imagine how wacky that must be.

If you wanna send in an ask, please remember to follow the rules provided on the pinned post.

[ut-monochromasis]

Hey Mono! Happy birthday, Mono! Do you get all your clothes from Silky or just the poncho?

Another 2g...

If you wanna send in an ask, please remember to follow the rules provided on the pinned post.

[ut-monochromasis]

Marching right along.

If you wanna send in an ask, please remember to follow the rules provided on the pinned post.

[ut-monochromasis]

Shame is an effective motivator.

If you wanna send in an ask, please remember to follow the rules provided on the pinned post.

[ut-monochromasis]

Thoughts on silksoot/sugarpin/whatever it is

:3

I know it was you who asked this. /silly

If you wanna send in an ask, please remember to follow the rules provided on the pinned post.

[ut-monochromasis]

Happy Cinco de Mono 2026!!!

Hey guys, Dragon8er here!

It's Mono's Birthday!!!

Hard to believe this bony bastard has been in my life for 7 years.

And I wouldn't have it any other way. <3

Thank you all so much for joining the journey of this AU and this smiley trash bag.

I know it's been a while since this ask blog has...y'know, done asks lol.

And I thank you all for your patience...

All Askable Characters will be Askable for...until I say so lol. I'm planning on having this go on for at least a day or two.

But also...

Silksuit!Muffet is now askable!!

But not forever. They don't have infinite money.

(Silksuit!Muffet co-created by myself and @bigfungus7).

But that's not all...

(A WIP)

The comic is coming this time. I pinky-promise.

I do wanna apologize for this taking so long.

Myself and Shiggy were way too busy in December to get these pages ready for then. And then it just sorta snowballed. Shiggy got a 2nd job, I got a wedding to attend, we just couldn't find the time.

But dammit, we're finding the time for this month!!

At the very least, Page 17 and the new version of Page 16 will be uploaded this month.

I hope you're looking forward to it!

Oh and there was one other thing... But I cancelled it.

The other day, as a potential idea for Cinco de Mono, I was experimenting around with the idea of a potential Mono redesign.

I decided against it, however.

Honestly, as simple as Mono's design is...at this point, I just kinda love it too much. Y'know, it's been a part of my life for 5 years at this point.

I love Mono.

And I love you all!

So thanks for sticking around!

This has been Dragon8er and I will see you all Drago-l8er!

[holidayking102]

Happy Cinco de Mono! Hope its a wonderful day! Have some art of Mono, his DeltaHub counterpart Seere, and some of his buddies!

(Version without the kids)

[ut-monochromasis]

Same dork-ass dad, two dork-ass lives.

Also I love the party hats...

[ut-monochromasis]

Happy Cinco de Mono 2026!!!

Hey guys, Dragon8er here!

It's Mono's Birthday!!!

Hard to believe this bony bastard has been in my life for 7 years.

And I wouldn't have it any other way. <3

Thank you all so much for joining the journey of this AU and this smiley trash bag.

I know it's been a while since this ask blog has...y'know, done asks lol.

And I thank you all for your patience...

All Askable Characters will be Askable for...until I say so lol. I'm planning on having this go on for at least a day or two.

But also...

Silksuit!Muffet is now askable!!

But not forever. They don't have infinite money.

(Silksuit!Muffet co-created by myself and @bigfungus7).

But that's not all...

(A WIP)

The comic is coming this time. I pinky-promise.

I do wanna apologize for this taking so long.

Myself and Shiggy were way too busy in December to get these pages ready for then. And then it just sorta snowballed. Shiggy got a 2nd job, I got a wedding to attend, we just couldn't find the time.

But dammit, we're finding the time for this month!!

At the very least, Page 17 and the new version of Page 16 will be uploaded this month.

I hope you're looking forward to it!

Oh and there was one other thing... But I cancelled it.

The other day, as a potential idea for Cinco de Mono, I was experimenting around with the idea of a potential Mono redesign.

I decided against it, however.

Honestly, as simple as Mono's design is...at this point, I just kinda love it too much. Y'know, it's been a part of my life for 5 years at this point.

I love Mono.

And I love you all!

So thanks for sticking around!

This has been Dragon8er and I will see you all Drago-l8er!

[ask-moonlightoc]

Happy birthday, Mono! (Comic not canon to the askblog, but perhaps canon to Monochromasis)

[ut-monochromasis]

It's beans.

[ut-monochromasis]

Happy Cinco de Mono 2026!!!

Hey guys, Dragon8er here!

It's Mono's Birthday!!!

Hard to believe this bony bastard has been in my life for 7 years.

And I wouldn't have it any other way. <3

Thank you all so much for joining the journey of this AU and this smiley trash bag.

I know it's been a while since this ask blog has...y'know, done asks lol.

And I thank you all for your patience...

All Askable Characters will be Askable for...until I say so lol. I'm planning on having this go on for at least a day or two.

But also...

Silksuit!Muffet is now askable!!

But not forever. They don't have infinite money.

(Silksuit!Muffet co-created by myself and @bigfungus7).

But that's not all...

(A WIP)

The comic is coming this time. I pinky-promise.

I do wanna apologize for this taking so long.

Myself and Shiggy were way too busy in December to get these pages ready for then. And then it just sorta snowballed. Shiggy got a 2nd job, I got a wedding to attend, we just couldn't find the time.

But dammit, we're finding the time for this month!!

At the very least, Page 17 and the new version of Page 16 will be uploaded this month.

I hope you're looking forward to it!

Oh and there was one other thing... But I cancelled it.

The other day, as a potential idea for Cinco de Mono, I was experimenting around with the idea of a potential Mono redesign.

I decided against it, however.

Honestly, as simple as Mono's design is...at this point, I just kinda love it too much. Y'know, it's been a part of my life for 5 years at this point.

I love Mono.

And I love you all!

So thanks for sticking around!

This has been Dragon8er and I will see you all Drago-l8er!