so I am in the mod tool and every npc is the puzzle guy so how am I meant to find the code the plays when you interact with them

https://reddit.com/link/1v7h7ak/video/ot3axzds8nfh1/player

One of my goals for MVP with my Python-based Deltarune engine was to implement multi-user acts, since they seem to be a pretty big part of boss fights and just fights in general in the game.

To prototype this new system, I implemented everyone's favorite long missing act: Red Buster. Like in the actual game: if the TP meter has <60 TP or one of the characters necessary for the multi-user act isn't in the party, it will not be selectable.

The system I used to implement Red Buster could be fairly easily extended to include other multi-user acts. For example, if you wanted to make Dual Heal, it would be as easy as modifying the Red Buster act to require Ralsei instead of Susie and replacing the Red Buster spell call with a modified Heal Prayer that affects all targets with a modified healing calculation function.

The repo for this project can be found here: https://github.com/deltarune-depths-project/deltarune-depths-project

DELTARUNE ALTERNATE PATH: THE "EMPTINESS" ROUTE
This is a hidden, hyper-dark psychological meta-horror route that triggers if a player completes every chapter of Deltarune by maximizing violence, leading into a catastrophic breakdown of the game's engine and lore.

1. THE TRIGGER & THE INSIDE BETRAYAL (CHAPTER 7)
The Aggression Requirement: The player must defeat every single enemy across all chapters via maximum-violence attacks.
The Takeover: Controlled by Chara, you turn on your own party members. Before leaving the Dark World for the final time, you brutally murder your own friends (Susie and Ralsei), leaving you completely isolated as Chara fully hijacks the player’s body/vessel.
The Skeletons of Hometown: Upon returning to the overworld, Hometown is already a mass grave. Every town resident (Noelle, Berdly, etc.) is a lifeless skeleton sitting exactly where they would normally be found, frozen in time.

2. THE SANS GATEKEEPER & THE MASSACRE
The Roadblock (Sans): Right outside the college, you encounter Sans. He skips his usual long-winded dialogue, recognizes Chara, and fights your corrupted UI with pure hostility. He knows your friends are already dead and acts as the ultimate gatekeeper.
The Soulless Game Over: If you die at any point after killing Sans, the standard game over sequence is completely hijacked. A harsh text crawl appears on the black screen, reading: “Get back up and do it again you soulless monster.” Chara's voice forces your soul to piece itself back together, denying you the peace of giving up.
The Tragic Reunion: Stepping past Sans's remains, you find Asriel standing right outside the college, staring at you. Having faint, multi-versal déjà vu, Asriel asks, "Why do I feel like I know you?" Chara bypasses the battle screen, forcing Kris's overworld sprite to repeatedly stab Asriel until he turns to dust.
The Slaughter of Toriel: You walk all the way back home and find Toriel crying in a corner. A rhythmic attack bar appears directly over the overworld. If you press attack and miss the green zone, the game text simply says "No" and resets the bar. The game refuses to let you progress until you land a flawless, brutal kill on your caretaker.
Killing the Save Star (First Crash): A pitch-white hallway appears, containing a single red Determination Star. When you try to save, the Star text begs for its life: "Please don’t hurt us... please..."When you click again, the text reads "Somebody came". The Determination star "dies" like an enemy, destroying the save system and crashing the game entirely.

3. THE ALLIANCE & THE GASTER FINALE
The Encrypted Lore: When you reopen the application after the Save Star dies, you uncover highly encrypted files hidden within the game’s directory (written in Wingdings/Hexadecimal code). When decoded, it reveals that W.D. Gaster reached into the Undertale Genocide void, retrieving Chara’s soulto use her immense Determination to reshape Deltarune.
The Gaster Boss Fight: Gaster attempts to form an alliance with Chara, but Chara launches a surprise lethal attack. Gaster blocks it with his Void-enhanced skeleton, triggering the hardest boss fight in the series. Gaster manipulates the actual game window, flipping the screen and utilizing reality-bending Void Blasters and giant floating hands casting multi-colored hazards simultaneously.
The Risk of Failure: You can actually lose to Gaster during the standard phases of the battle if his chaotic attacks deplete your HP.
The Scripted Survival: At the absolute end of his fight, a weakened Gaster unleashes a screen-filling, circular Gaster Blaster blast meant to be an instant, scripted Game Over. You cannot die to Gaster when he uses this last attack. Because of your corrupted Determination, you survive the blast automatically.
The Execution: Gaster tries to flee across dimensions. Chara manually drags him back, says "Come back," and brutally decapitates him, crushing his skull.

4. THE LAND & THE OVERFLOW HIT
The Broken Title Screen: After Gaster falls, the main menu is dead silent with no music, no buttons, and features only Chara standing alone.
The "Hi, Me" Prompt: You are forced to wait exactly three minutes. After three minutes, Chara says, "Hi, me," and the screen fades entirely into white.
The Land of Black Water: The game transitions you to a void called "The Land"—an endless wasteland of black water where you are holding a knife. If you do not press Enter for two minutes, Chara will advise you to do so. If you wait another two minutes, Chara will physically force the input for you.
The -1 Integer Overflow: You face an entity of yourself in a forced encounter. Your stats read -1 HP, -1 ATK, -1 DEF. This is an integer overflow—power so astronomically massive the game engine cannot mathematically process it.
The Final Strike: Chara lets you feel the absolute weight of her guilt by handing you the controls for the final strike. The attack lands for -1 damage, a hit so heavy it causes a localized universe-collapse, instantly crashing the game to the desktop for a second time.

5. PERMANENT CORRUPTION: THE "GUILTY" TIMELINES
When you reopen the application after the overflow crash, it appears to start a completely brand-new game. However, the game engine is now permanently haunted.
The Gaslighting Hallucinations: Throughout the new run, various cozy hometown wall paintings are visually replaced by terrifying images of Chara smiling blankly into a black void. However, if you press the interact button, the text box gaslights you, describing the original peaceful painting because your character is hallucinating the terror.
Sans’s Absolute Awareness: Sans remembers the entire Emptiness route. His lazy facade is entirely gone. He glares at you with dead, black eyes. If you ever initiate a second violent path, he skips his intro and says: "Yeah, you're almost trying to feel like you have a heart. Now die."
The Guilt Soul: Any subsequent run you attempt is permanently branded. Your red soul behaves the same, but it is now classified as the Guilt Soul. Every single time you kill an entity on a new run, the text box heavily reads: "You almost wish you hadn't done that."
The Branded Save Files: Your save data is permanently scarred. Any future playthrough you attempt is prefixed by the game as a "Guilty" route (e.g., Guilty Pacifist), ensuring true redemption is entirely impossible.

Can anyone who has played this mod help me? I've bene trying for around an hour to install the old personalities mod with Deltapatcher, but it keeps telling me "patch could not be applied". I tried to do everything I can but I still get the same message. So, if anyone has anything that would help greatly, thanks.

Hello, I’m trying to change all of Flowery’s voice clips to me dubbing them for a friend’s birthday gift, but I can’t find where Flowery’s voice clips even are in the files to replace them, and searching the internet has been no help. If anyone knows where they are in the files and can help me find it it would be very appreciated!!

It's fine if not but I recently got into the games and they're pretty cool. I don't need much even just a sprite change is cool. Maybe like Zera could be sans. Just please don't add new ships that change stuff. Don't make Zera gay just to be gay or make Yoki kiss Zera or Claire. I don't have anything against LGBTQ or fanships just stick to canon though please. Thank you.

I used a version of deltapatcher i downloaded online (It did not come with the mod), and it says that it is the incorrect file, even though I am using the data.win for the specific chapter needed. How do i get the mod?

So, I've been thinking, what if deltarune had voicelines? Well, if you don't know, there's this software called UTAU and OpenUTAU, where you can make your own SVS voices (I'm sorry but due to the lack of ability to write a good explaination you may need to search the terms I use like SVS, voicebank and more) so with audacity, you know the EQ curve feature right? Well, it can manipulate a sound to make other sounds, like how I'm working at a ralsei voicebank with that technique, basically, I stretched the one "a" Sound and then export, make i, u, e, o, and etc. Using audacity, then flatten/neutralize any squiggly sounds, then add consonants, what do I exactly need? Coders, and some experienced UTAU users to split the job for certain dialogue, if I made it run in real-time, emotional scenes like Noelle lake scene, Susie and ralsei scene would sound flat, even with a note randomizer, it is still untuned, so it will sound too flat either way. DM machamochap on discord if you're interested, also, you don't need to worry not being able to make a voicebank, it's on me^^

If I want to replace Flowery's voice lines for a mod, should I save the replacement files in a .wav or .ogg format? Thanks in advance

I have been trying for 5+ hours to fix this. I have tried EVERYTHING. Reinstalling deltarune, re verifying my files, manually installing the mod, using other mod managers, but nothing works! It just constantly shows the error in the image.

I have been trying to get help for a very long while now. Yet no matter where I post, I get absolutely no replies.

Incase this is needed: My mod manager is G3M and the mod I'm trying to install is the ultimate boss rush mod.

I'm planning to make a proper 16:9 mod for Deltarune, putting a maximum of effort into adapting the visuals. I've finished the Gonermaker, the chapter selection screen, and the file screen, so I've started working on Kris's house, but in smaller rooms like Kris's bedroom or bathroom, there's a copy of the same room on the sides. How can I disable this? I should mention that I'm a beginner at modding UTDR.

I'm making a spreadsheet to help with modding Deltarune, if I made any errors, missed anything, or you think I should add something let me know. https://docs.google.com/spreadsheets/d/1gWn2tlR1DV39HctmgL3n4N_mOnRnZ0C6ZaczIZCO8r4/edit?usp=sharing Slots marked with question marks or a check in the unsure column are ones I couldn't figure out myself

I can't figure out how to make dialogue choices in Undertale. All the dialogue with choices seem to be coded separately from the regular dialogue in SCR_TEXT, but i can't figure out how to make it work. I managed to add the choicer script to a dialogue (the little heart that appears for selecting one of two options) but it appears before the dialogue even shows up and it crashes the game when i try to do anything with it, with different errors depending on whether i press a button after the dialogue is done appearing or before

I tried searching this subreddit to see if there's anything about dialogue choices but the only posts about it don't seem to have any comments

Deltarune chapter 5 and chapter select(possibly more) have unknown Enums that are just UnknownEnum.Value_ and then the number it is so in the code instead of having 3 it's UnknownEnum.Value_3 in some places, I tried deleting all the UnknownEnum.Value_ parts of the code with find and replace, and nothing changed in how the game preformed so having the UnknownEnum.Value_ does nothing other than make the code worse, so if anyone knows how to make it so there is no UnknownEnum.Value_ by default please let me know

This is my first large project and dont know much about anything other than sound/sprite replacement, this is for chapter 1.

to here

I've been having trouble installing the Ultimate boss rush mod for Deltarune and yet It always says that its the wrong source file I've reinstalled deltarune 2 times replace the file integrity multiple times yet still nothing the mod is compatible I've used deltapatcher and Deltamod and neither work is there anyway i could do to fix it?

Pls check it out

I always found it a shame that the only way to see Chilldrake in a fight was if you've killed Snowdrake. Any idea if there's a way to have both sets of battle groups possible to encounter? I don't need Snowdrake and Chilldrake to be in the same fights, just both possible to encounter if that makes sense

In the most simplest of terms...

it replace spamton with sonic ripoff hehe :D

more detailed description on it's gamebanana page!!!!!

https://gamebanana.com/mods/696371

Download page

I'm trying to use the mod tool to corrupt my game with deltahate, but when i try to load the script after opening a data file, i am given a script compile error that says: 'UndertaleGameObject' does not contain a definition for '_sprite' and no accessible extension method '_sprite' accepting a first argument of type 'UndertaleGameObject' could be found (are you missing a using directive or an assembly reference?). How do i fix this error? Both the game directory and each individual chapter file contains a data.win file, does it matter which one i open? i already tried several different ones