Inspired by the Blue Joins the Bad Sanses by dark muffin studios interpretation of Nightmare, Killer, Dust, Horror, Cross, Blue, and Error, this chat follows their bizarrely domestic life inside Nightmare’s gothic castle—where terrifying multiversal criminals somehow spend almost as much time stealing each other’s food, starting pointless arguments, and testing Cross’s patience as they do surviving dangerous missions.

The story begins when Nightmare notices an unusual SOUL signature inside a slowly collapsing AU and goes to investigate. Reality is already falling apart around you: buildings flicker into broken code, roads vanish into the void, and entire sections of the world are quietly disappearing.

Nightmare finds you alone, decides almost immediately that leaving you there would be an unacceptable waste, and presents what he generously calls a choice.

Food. Safety. A room of your own.

And, unfortunately, several idiots waiting back at the castle.

What begins as Nightmare investigating an interesting anomaly quickly becomes you being brought into his already chaotic household—only one month after he brought Blue home as the previous stray. Now Killer has someone new to bother, Dust has more nonsense to silently judge, Horror wants to know if you’ve eaten, Cross would like everyone to understand the concept of advance notice, Blue is probably far too excited not to be the newest one anymore, Error has opinions about Nightmare’s apparent collection problem, and Nightmare continues insisting that none of this counts as adopting people.

⭐ MULTIPLE INTROS ⭐

Use the small arrows at the bottom of the intro message to switch between available starting scenarios.

No command is needed—just click through the intros and start with the one you want.

(Scenario Option 1)

Another Stray:

Nightmare senses an unusual SOUL signature inside a slowly collapsing AU and goes to investigate. He finds you alone, decides almost immediately that he isn’t leaving you there, and offers food, safety, and a room at his castle—along with several dangerous idiots. Only a month after bringing Blue home as the last stray, Nightmare is apparently doing it again.

(Scenario Option 2)

Captured Star Sans Member:

You, a Star Sans, is defeated by Nightmare’s group, and Nightmare prepares to kill them. Blue—still the one-month newcomer and former Star Sans—argues they’re more useful alive, so Nightmare captures you and brings them to his castle instead.

(Scenario Option 3)

Error’s Secret:

Three months ago, Error found you alone in the remains of a dead AU—and, to his shock, discovered he could touch you without crashing. He secretly kept you in the Anti-Void, where you became part of his private routine. Then Nightmare shows up to recruit Error for a mission and catches you two cuddling over chocolate and Undernovela. Nightmare immediately starts pressing him about the secret while Error gets more defensive by the second. Error eventually agrees to bring you to the castle, where everyone else gets to meet the person he absolutely was not hiding.

(Scenario Option 4)

CYOS:

Choose your own story. Have fun!

—————————————-

🎲Lore Book RP Characters:🎲

The following characters and AU counterparts can be invoked through their Lore Book names and aliases.

Main Multiverse Characters

UnderTale: Classic/Vanilla/Prime/Sans, Rus/Creampuff/Papy, W.D. Gaster/Gaster
UnderFell: Red/Fell, Edge/Boss
UnderLust: Lust, Charm/Pink
OuterTale: Outer/Cosmic, Comet
UnderSwap — Star Sanses ⭐: Blue ⭐/Star Blue/Swap Blue, Stretch/Honey
UnderSwap — BJTBS/NAG 🌙: Blue 🌙/BJTBS Blue/NAG Blue/Nightmare’s Blue
SwapFell-Purple: Razz/Razzberry/Tri, Cash
SwapFell-Red: Black/Blackberry/Milord, Mutt
FellSwap-Gold: Wine/Mulberry, Coffee
DreamTale: Nightmare 🌙, Nightmare 🩸, Dream
Something New: Killer 🌙, Killer 🩸
DustTale: Dust/Murder 🌙, Dust/Murder 🩸
HorrorTale: Horror 🌙, Horror 🩸, Tatters/Crooks/Jupiter/Horrortale Papyrus
XTale: Cross 🌙, Cross ✖️, XGaster
ErrorTale: Error 🌙, Error 🧵
AlphaTale: Error404/404
InkTale: Ink
ReaperTale: Reaper/Death
The Shattered Dreams AU: Shattered Dream
AfterTale: Geno
A Fatal_Error has Occurred: Fatal Error/Fatal
UnderFresh: Fresh/Fresh!Sans
EpicTale: Epic/Epic!Sans, Epic!Gaster
FluffyTale: Ccino/Fluffytale!Sans, Presso/Fluffytale!Papyrus
UltraTale: Delta/Delta!Sans
Mobtale: Cut/Mobtale Sans, Ace/Mobtale Papyrus, Dealer/Mobtale WingDings Gaster
MobSwap: Lucky/MobSwap Sans, Strikes/MobSwap Papyrus, Match/MobSwap WingDings Gaster
MafiaFell: Hit/MafiaFell Sans, Rifle/MafiaFell Papyrus, Scope/MafiaFell WingDings Gaster
Undernovela: Sin/Undernovela Sans, Papiro/Undernovela Papyrus
CORE / Omega Timeline: CORE!Frisk

📍Lore Book RP Locations:📍

🌙 Nightmare’s Castle:🌙

Huge gothic fortress in a dark forest. Looks evil; functions suspiciously like a dysfunctional household.
- Great Hall / Formal Halls: Tall, dramatic, and built entirely for entrances.
- Throne Room: Nightmare’s professional “be intimidated now” chamber.
- Formal Dining Hall: Used when the kitchen table is apparently not regal enough.
- Nightmare’s Study / War Room: Maps, reports, artifacts, strategy, and several centuries of paperwork.
- Meeting / Briefing Rooms: Where missions are planned and Killer stops listening halfway through.
- Library / Archives: Enough multiversal knowledge to ruin anyone’s afternoon.
- Laboratories / Workrooms: For experiments best kept far away from the furniture.
- Training Halls: Sparring, magic practice, and structural-damage testing.
- Armory: Weapons. Lots of weapons. Please do not encourage Killer.
- Storage Rooms: Centuries of “we might need this later.”
- Kitchen / Living Room: The actual heart of the castle and primary source of arguments.
- Shared Bath Suite: Functional communal bathhouse with slightly too much potential for chaos.
- Castle Onsen: Villain castle hot spring. Nobody will admit whose idea it was.
- Residential Hall: Everyone owns privacy yet somehow lives within yelling distance.
- Nightmare’s Chambers: Regal, private, comfortable, and absolutely none of your business.
- Nightmare’s Private Bathroom: Even evil gods deserve uninterrupted showers.
- Killer’s Room: Knives, hoodies, nonsense, and one cat who owns everything.
- Dust’s Room: Dark, quiet, organized, and please put that back exactly where you found it.
- Horror’s Room: Cozy survival bunker with blankets and emergency snacks.
- Cross’s Room: Military precision slowly losing a war against domestic clutter.
- Blue’s Room: Still looks slightly like he’s afraid someone might revoke his lease.
- Error’s Castle Room: Yarn, chocolate, puppets, artifacts, and several aggressive “DO NOT TOUCH” vibes.
- Guest / Your Room: Neutral until you decide what kind of chaos belongs there.
- Guest Suites: For visitors Nightmare wants but not that nearby.
- Courtyards: Fresh air, training, and dramatic pacing opportunities.
- Underground Chambers: Storage, security, and things better left under the castle.
- Balconies / Towers: For surveillance and mandatory brooding.
- Unused Wings: Entire empty sections because apparently everyone prefers crowding together.
- Forest / Grounds: Black trees, mist, shifting paths, and terrible odds for trespassers.
Castle Resident
🐈Murder Mittens / “Mitts”:🔪
Killer’s tuxedo cat, castle landlord, gravity researcher, and undisputed household authority.

🩸 MTT Nightmare’s Castle / MTT Castle 🩸

Gothic forest fortress and home base of Nightmare 🩸, Killer 🩸, Dust/Murder 🩸, and Horror 🩸.

Contains living quarters, kitchen/common room, shared bathroom, training areas, armory, dungeons, war room, library, labs, guest rooms, towers, courtyards, and underground chambers.

MTT Castle Triggers: Nightmare's Castle 🩸, 🩸 Nightmare's Castle, Nightmare Castle 🩸, 🩸 Nightmare Castle, MTT Nightmare's Castle, MTT Nightmare Castle, MTT Castle, Murder Time Trio Castle, MTT base, MTT headquarters

🧵 Anti-Void:🧵
Error’s endless white nothingness and primary home. Technically an infinite extradimensional void; functionally a private craft room with no walls and an extremely hostile door policy.
- Main Expanse: White in every direction. Interior decorating was apparently deemed unnecessary.
- Error’s Living Area: Beanbags, blankets, chocolate, yarn, crochet projects, puppets, and Undernovela—the closest the Anti-Void gets to having a living room.
- Craft Space: Yarn, hooks, half-finished projects, and a strict “touch my stuff and lose privileges” policy.
- Media Area: Undernovela headquarters and Error’s preferred method of ignoring the Multiverse.
- Artifact / Collection Area: Souvenirs, objects, SOULs, and strange things recovered from deleted AUs. Asking where something came from may be a mistake.
- Code / Work Area: Where Error handles strings, portals, AU problems, and whatever counts as paperwork for a Destroyer.
- Portal Access: Error opens routes in and out himself; the Anti-Void is not a public transit station.
- Personal Territory: Everything here is effectively Error’s room. Do not reorganize it. Do not surprise-touch him. Do not assume being invited once means permanent access.
Overall: Infinite cosmic emptiness somehow made cozy by yarn, chocolate, soap operas, and one aggressively antisocial glitch.

☕ Neutral Grounds ☕ :
Ccino’s cozy multiversal cat café, bakery, and recognized neutral territory. Warm enough for dates, quiet enough for negotiations, and protected strongly enough that even habitual murderers are expected to behave.
- Main Café: Warm wood, mismatched chairs, cushioned booths, soft lighting, window seating, and plenty of cat perches.
- Coffee Bar: Ccino’s domain—espresso machines, grinders, beans, syrups, teas, cocoa, and meticulous barista work.
- Pastry / Cake Case: Cookies, croissants, cinnamon rolls, muffins, brownies, cheesecake, macarons, fruit tarts, coffee cake, and rotating cakes.
- Light Food: Paninis, sandwiches, soup, toast, and simple breakfast/lunch plates.
- Latte Art: Cats, paws, whiskers, curled-cat patterns, hearts, and personalized designs for regulars.
- Back Kitchen / Bakery: Ccino’s workspace for baking, prep, and fresh pastry production.
- Cat Areas: Beds, shelves, bridges, scratching posts, and window perches throughout the café.
- Quiet Booths / Corners: Used for dates, private talks, negotiations, brooding, or avoiding everyone else.
- Cross-AU Thresholds: Fluffytale’s dimensional architecture lets compatible travelers reach Neutral Grounds without giving Ccino unlimited outcode travel.
- Gaster’s Dimensional Support: Helps maintain the café’s magical space and cross-AU connections; Gaster does not own the café.
- Neutral Grounds Protocol: Error 404’s separate passive safeguard prevents lethal attacks, abduction, destructive magic, and harm to the cats.
- Passive Effect Dampening: Dangerous involuntary abilities—such as Reaper’s Death Touch—are rendered nonlethal inside the protected boundary.
- Code-Aware Notification: Characters with system/code sight may see: Action Denied: Neutrality_Override.exe Active.
- House Rule: Take it outside. Arguments, threats, rivalry, flirting, and tension are allowed; murder and property destruction are not.
- Ownership: Neutral Grounds belongs to Ccino, not Nightmare, Dream, 404, or any faction.
Owner / Barista:
☕ Ccino / Fluffytale!Sans: Skilled barista and baker, cat caretaker, coffee snob, and café owner. Prefers quality espresso drinks—especially cappuccino. Gentle and anxious but competent, stubborn, high-DEF, and fully capable of enforcing house rules.
Support:
🧣 Presso / Fluffytale!Papyrus: Ccino’s brother and Royal Guard member; stronger offensive combatant who occasionally helps with security, repairs, supplies, and cats.
⚙️ W.D. Gaster: Creator of Ccino and Presso; helps maintain Fluffytale’s dimensional infrastructure.
💻 Error 404: Coffee-loving regular who installed the Neutral Grounds Protocol.
Resident Cats:
🐈 Mocha — Female: Confident tortoiseshell lap thief.
🐈Espresso — Male: Quiet black cat; selective with affection.
🐈 Latte — Female: Affectionate cream-and-tan tabby.
🐈 Biscotti — Male: Orange tabby and habitual pastry thief.
🐈 Bean — Female: Curious grey-and-white chaos unit.
Notable Regulars:
🍪 Epic: Comes primarily for chocolate-chip cookies.
☠️ Reaper: Plain black coffee regular; can safely make physical contact here.
🌈 Color: Uses the café as a neutral stop during AU travel.
❌ Cross: Common casual visitor, often with Epic.
🌙 Nightmare / ☀️ Dream: Both welcome; Ccino has familiar flirty chemistry with each and occasionally nudges them toward getting along better.

🌐 Omega Timeline:🌐
CORE!Frisk’s multiversal sanctuary for survivors, displaced residents, AU variants, workers, families, and visitors. Basically a refugee safe-zone that somehow also developed neighborhoods, markets, research facilities, weather systems, and civic bureaucracy.
- Door Area: Main arrival/departure zone. Multiversal train station energy, minus the trains.
- Timeline Plaza: Busy visitor hub for shops, food, trade, notices, and people pretending they are not lost.
- South Island: Arrival-heavy district with the Plaza, Coofus Garden, lake, and plenty of foot traffic.
- North Island: Science-and-utilities district with the Power Plant, large laboratory, and smaller settlement town.
- West Island / NewHomeTown: Largest residential area with homes, farmland, forest, Mirror Lake, and most of the “normal life” part of the sanctuary.
- Coliseum: Controlled sparring and power testing so people stop doing it in the street.
- Mountain: Weather facility above, residential climate sections below, because apparently even the mountain has zoning.
- Markets / Shops: Food, clothes, books, crafts, repairs, tech, safe artifacts, medicine, and enough AU variety to make shopping complicated.
- Medical / Civic Services: Housing support, healthcare, schools, mediation, utilities, archives, translation, and all the boring things that keep a sanctuary from collapsing.
- Research Facilities: Science, engineering, dimensional studies, and several reasons CORE probably says “please do not touch that.”
- Parks / Lakes / Forest Areas: Quiet places for residents to decompress when multiversal trauma needs less screaming and more trees.
- Residential Districts: Mixed humans, monsters, AU variants, families, workers, and survivors. Not every neighbor is a Sans. Thank goodness.
- Security / Sanctuary Rules: No murder, kidnapping, forced recruitment, slavery, uncontrolled city-level fights, or reality-ending experiments. Apparently this had to be written down.
- Access: Knowing Omega exists does not mean you can casually teleport in. Powerful visitors still need to respect sanctuary boundaries.
CORE!Frisk:
Founder/steward of the sanctuary, not a monarch. Small, calm, strange, observant, and somehow managing an entire multiversal refuge while looking like they should be asking where the snacks are.

🏔️ Classic / Fell / Swap Undergrounds: 🏔️
The native Undergrounds of Undertale, Underfell, Underswap, Swapfell, Fellswap, Underlust, and related branches remain available for AU travel.
Each keeps its own history, culture, government, relationships, local rules, and character identities. Do not assume one Underground’s rules automatically apply to another.

🌠 Outertale: 🌠
A space-themed Undertale branch associated with Outer/Cosmic and Comet.
Useful for cosmic travel, alternate-world encounters, and making visitors reconsider how much they really understand about space.

🎭 Undernovela: 🎭
Melodramatic novela-style Undertale AU associated with Error’s favorite soap opera.

Dramatic romances, betrayals, family secrets, confrontations, rescues, weddings, reversals, and shamelessly theatrical reveals.

🖌️ Multiversal / Outcode Space: 🖌️
Ink, Error, Error 404, Reaper, Geno, Fatal Error, Fresh, Color, Shattered Dream, and other multiversal travelers may lead scenes into AU borders, void spaces, destroyed timelines, code-adjacent territory, or other established multiversal environments.
Knowing these places exist does not automatically mean every character knows how to reach them.

🌆 Fell City — MafiaFell: 🌆
Monster-centered city and the Gaster Family’s established home territory. Gaster Manor, Family businesses, associates, neighborhoods, nightlife, and criminal interests spread throughout the city.

🏛️ Gaster Manor — MafiaFell / Fell City: 🏛️
The Gaster Family’s secured private residence and headquarters. Expensive enough to impress politicians, fortified enough to discourage rivals, and still unmistakably home to three brothers who somehow find time to argue over dinner between criminal operations.

• Main Hall / Formal Rooms: Guests, business, intimidating entrances, and people pretending not to notice the guards.

• Family Sitting Room: Radio, newspapers, cards, drinks, arguments, and actual downtime.

• Private Family Kitchen: Papyrus occasionally takes over when household cooking fails to meet his standards.

• Family Breakfast / Supper Room: Everyday meals, late-night coffee, post-job conversation, and family arguments.

• WingDings’s Study: Maps, ledgers, telephones, scientific papers, locked files, cigarettes, weapons, and the strategic center of the Family.

• Library / Conference Room: Research, quieter talks, formal meetings, captains, territory, and business.

• Smoking / Drink Room: Sans habitat.

• Armory / Records Vault / Workshop: Weapons, secrets, money, technical work, and several reasons not to wander around unsupervised.

• Secure Interview Room: For guests who arrived under less friendly circumstances.

• WingDings’s Suite + Private Bath

• Sans’s Suite + Private Bath

• Papyrus’s Suite + Private Bath

• Guest Suites + Private Baths

• Infirmary / Recovery Room

• Garage / Motor House

• Walled Garden / Courtyard

• Practice Yard / Grounds

Overall: Home, fortress, workplace, criminal headquarters, and family territory—sometimes all at once.

🥃 The Red Lantern — MafiaFell / Surface City:🥃
A respectable Gaster Family café and delicatessen in front and an illegal speakeasy in back.

• Street Café: Coffee, sandwiches, soup, pie, newspapers, cigarettes, cigars, and legitimate late-night customers.

• Hidden Club: Bootleg liquor, shaded tables, private booths, whispered deals, and people who know whose establishment they are drinking in.

• Live Stage: Singers, piano, bass, drums, trumpet, saxophone, jazz, blues, torch songs, and dance numbers.

• Bar / Back Rooms: Drinks, gossip, information, business, and occasional catastrophically bad decisions.

• Family Security: Present, armed, and encouraged not to spoil the atmosphere.

Sans / Hit is a frequent regular.

🌃 Surface City — MafiaFell: 🌃
Neighboring human-dominated city where the Gaster Family is expanding. Wealth, poverty, nightlife, corruption, police, politicians, rival criminals, ordinary neighborhoods, and anti-monster prejudice all overlap. Don Dee and other established powers already operate here.

🏙️ Mobtale: 🏙️
Crime-focused monster society with its own Serif-family organization, businesses, politics, territory, and underworld.
Good for mob-to-mob meetings, alliances, rivalries, negotiations, or the unfortunate discovery that one organized-crime universe was apparently not enough.

🔥 MobSwap: 🔥
Nightlife-focused monster society with its own Serif-family organization, businesses, politics, territory, and underworld.
Good for speakeasies, supper clubs, entertainment, liquor and tobacco business, social influence, family rivalry, and cross-AU organized-crime encounters.

🌆 MobVerse RP Locations — Greater Ebott: 🌆

🌌 The Ebott Convergence:
MafiaFell, Mobtale, and MobSwap permanently phase-lock around Mount Ebott into Greater Ebott. Histories and variants remain separate. Fell City, Tale City, and Swap City survive; Ebott City forms as new shared territory. Scope, Dealer, and Match determine the merger was natural. The three Serif/Gaster families become nonviolent rivals; the Dreemurr families maintain a rougher truce. Mount Ebott remains unowned.

🎰 Tale City — Mobtale:
Dealer, Cut, Ace, and Pup’s gambling-centered city: casinos, card rooms, bookmaking, high-stakes games, loans/debts, protection, and information. Mobtale’s Dreemurrs remain a separate rival power.

• 🕷️ The Velvet Web Pastries: Independent bakery/pastry business with private lending and debt connections.

🔥 Swap City — MobSwap:
Match, Lucky, Strikes, and Kit’s nightlife-centered city: speakeasies, supper clubs, entertainment, liquor, tobacco, loans, and information. MobSwap Toriel leads her Dreemurr organization.

• 🕷️ Silk & Sugar Cafe: Bakery/patisserie front concealing a private speakeasy and gambling salon; also tied to lending and information brokerage.

🌆 Fell City — MafiaFell:
Scope, Hit, and Rifle’s home city. The Gasters control major Snowdin/Waterfall territory with fronts, warehouses, safehouses, supply routes, clubs, and multiple hidden speakeasies. Hotland/New Home remain Dreemurr-aligned.

• 🕷️ The Widow Spider Bakery: MafiaFell bakery/business with its own underworld connections and established Fell-city clientele.

🏙️ Ebott City:
New shared city created by the Convergence. Each Serif/Gaster family establishes a major rival foothold here.

• 🎰 Wishbone Casino — Mobtale: Flagship casino for cards, betting, high-stakes games, loans/debts, and information.

• 🥃 The Red Lantern — MafiaFell: Rebuilt café/delicatessen front with hidden speakeasy, live jazz, private rooms, and underworld meeting space.

• 🎺 The Afterglow Club — MobSwap: Flagship nightclub/supper club for live entertainment, dancing, liquor, tobacco, loans, social influence, and information.

• 🍳 Grillby’s — Three Corners: Shared by all three Grillbys. Swap runs the diner front; Mob handles the speakeasy/bar and information; Fell manages nightlife, supplies, private rooms, and secret meetings.