Buddy Verity

Explain the entirety of deltarune lore as it is currently known

verity: here is your awnser Deltarune is Toby Fox’s big episodic RPG that’s set in a parallel world to Undertale. It’s planned as seven chapters total. As of right now, Chapters 1–5 are fully out, and Chapters 6 & 7 are still coming (Chapter 6 is in active development and aimed for 2027-ish). The story is still very much unfinished, so a lot of mysteries are still open!!
The Core Setup (The World & The Prophecy)
There are two worlds:

The Light World = everyday reality (the town of Hometown, where monsters and the one human kid live side-by-side).
The Dark Worlds = fantasy realms that appear when someone creates a Dark Fountain. Dark Worlds give life and personality to ordinary objects (turning them into “Darkners”). They’re beautiful and fun… but if too many Fountains open, the balance between Light and Dark breaks and the world ends in something called The Roaring.

There’s an ancient prophecy about three heroes who will seal the Fountains and stop the Roaring:

A Human
A Monster
A Prince from the Dark

The player is a mysterious entity controlling a red SOUL that lives inside the human kid. The kid (Kris) can sometimes rip the SOUL out and act on their own… which is very important later.
Chapter 1 – The Beginning
Kris (the quiet, non-binary human teen living with Toriel) gets paired with the delinquent monster girl Susie for a group project. Their teacher Alphys sends them to the supply closet for chalk… and they fall into the first Dark World (Card Kingdom, created from the old classroom).
They meet Ralsei, a fluffy prince who claims to be the third hero of the prophecy. Together they adventure through Card Kingdom, befriend the little guy Lancer, fight his tyrannical dad King, and seal the Fountain.
That night, Kris rips the SOUL out of their body, locks it in a birdcage, and stands there with a knife, smiling at the player. Creepy start!!
Chapter 2 – A Cyber’s World
The next day, Kris and Susie bring the Card Kingdom Darkners into Castle Town (Ralsei’s home). Then they fall into a new Dark World in the computer lab — Cyber World, ruled by the glamorous Queen.
They team up with shy reindeer girl Noelle (and her bird friend Berdly). There’s a secret “Weird Route” (also called Snowgrave) where the player can force Noelle to become stronger and colder in a really dark way.
They seal the Fountain… but that night Kris creates another Fountain in their own living room while Toriel is home.
Chapter 3 – Late Night
Kris, Susie, and Toriel wake up inside

the new Dark World: TV World, ruled by the lonely TV host Tenna. It’s a big game-show adventure with boards, prizes, and lots of nostalgia for when the family used to watch TV together.
Near the end, the mysterious Roaring Knight (a masked, powerful figure who’s been creating Fountains) appears. Undyne tries to stop it, but the Knight escapes into the old bunker under the town, taking Undyne with it. Susie finds a code on the bunker door.
Chapter 4 – Prophecy
The next morning everyone goes to church. Kris and Susie investigate the bunker code. They end up at Noelle’s big house (the Holiday family). Kris finds a code written inside Dess’s (Noelle’s missing older sister) old guitar… then rips the SOUL out again and hides it.
The SOUL sneaks around and overhears Kris talking on the phone to someone who knows about the Dark Worlds and doesn’t want Susie to get the guitar.
Later they fall into a Dark World inside the church itself — the Dark Sanctuaries. They meet a wise old man (heavily implied to be connected to Gerson from Undertale) who teaches Susie about hope and the real meaning of the prophecy. They fight Titans (huge beings made of pure darkness) and seal the Fountain.
The Knight is still out there, and Kris keeps making secret phone calls…
Chapter 5 – Festival Day (The Field of Pink and Gold)
Hometown is having its big Festival! Susie is getting ready for a date with Noelle, Castle Town is helping, and everything feels bright and happy for a little while.
After the Festival and a sweet beach moment, Susie goes into Asgore’s flower shop (“Flower King”) to buy flowers for Noelle. While she’s inside, Kris rips the SOUL out again and creates a Dark Fountain right there.
They fall into the Flower Kingdom — a beautiful garden world made from Asgore’s flowers. The main character of this world is Flowery, a golden flower who took human form, along with six other flowers (Aqua, Seth, Yellow, Green, Blue, Orange) that Asgore had been carefully keeping alive for years. These flowers want to make Asgore happy and “repay” him for all the love he gave them.
There’s a big emotional final battle against Flowery and the six flowers. After winning, Asgore finally opens up: he’s been obsessed with Dark Worlds because he blames himself for a past tragedy in town and wants to prove his innocence. He realizes he’s been pushing his family away.
Kris seals the Fountain… but a second Fountain had already been opened. The Roaring Knight swoops in and abducts Asgore.

Flowery tries to stop the Knight but gets cut in half and turns back into a torn golden flower.
The chapter ends with Asgore missing, Flowery badly hurt, and the heroes having one more code for the shelter/bunker. Toby has said this was meant to be the last “fun” adventure before the story gets much darker.
Big Ongoing Mysteries (as of Chapter 5)

Who (or what) is the Roaring Knight?
What really happened to Dess (Noelle’s sister)?
Why does Kris keep creating Fountains and making secret phone calls? Who are they talking to?
What’s the true nature of the player’s SOUL and the vessel we were asked to create at the very beginning?
What is the “Angel’s Heaven” the prophecy talks about banishing?
Why does Ralsei know so much… and why does he sometimes hide things?
What’s inside the bunker under Hometown?

There’s also the continuing Weird Route that gets even darker and focuses heavily on Noelle, and secret Shadow Crystal bosses in every chapter.