SillyTavern Adaptations

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Featuring:

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About

Welcome to SillyTavern Adaptations. Let's define what this project is and what it isn't.

What it is:

• This is a set of tools I've made to experience tabletop games I never will never get to play in real life.
• An attempt to make AI storytelling work within confinements of game systems.
• To put it simply: this is the AI Dungeon Master/AI Game Master that does its best to follow the rules and use maps. Those are still text prediction models. Take everything AI says with a grain of salt, it's still powered by LLMs and every known flaw of theirs still translates to the game. Expect some handholding and editing on your end.
• What you see was made possible thanks to Google Gemini 2.5 Pro and Google AI studio. If you're using these adaptations, you should consider using it as well.
• Everything here was made using the frontend SillyTavern and its simplest tools: Character Cards, Chat Completion Preset (CCP), UI Themes, and most importantly: Lorebooks. So far no extensions are being utilized at all.
• This will guarantee the project's compatibility with all future AI models as long as SillyTavern or its successors keep the Lorebook feature.
• You can more or less perfectly simulate the tabletop experience in most languages.
• You can faithfully experience the published adventure modules.
• Playing premade scenarios is preferable over experimenting yourself.
• Adventure modules feature a system of Meta-Equipment, Meta-Navigation, Meta-Relationships, Meta-Continuum and Meta-Scenario World Info entries that will make your Referee present you the adventure just like a real world Referee would, and it will keep you on the intended track. All the rooms inside the dungeons you will explore in adventure modules were manually handcrafted and they exist in a mapped out world.
• This is a stylistic choice. LLMs don't need chatbots to referee games. Lorebooks on the other hand are quite useful.

What it isn't:

• A simulation. It's a simulacrum.
• It isn't perfect.
• It isn't substitute for your human GM. (But it is the next best thing.)
• SillyTavern simply wasn't made with RPG systems in mind. This is not how normal people botmake. I am using the program outside of its intents and purposes simply because it was the best tool at my disposal.
• This isn't result of attaching TTRPG rulebooks to ChatGPT. Each World Info entry that comes from a rulebook has been rewritten in instructive manner for the reader (AI model) to interpret like a tabletop game referee.
• This is not a model nor a LoRA. Everything you see is made possible by prompting and utilizing Lorebooks, the same technology that existed since AI Dungeon 2 back in 2019. It's just that modern models such as Gemini are so powerful they can utilize these absurdly large Lorebooks. Keep in mind that LLM doesn't have 100% of the Lorebooks' entries on its mind all the time, it takes some warming up for everything to load.
• Your AI may still be wrong occasionally. You may need to manually edit things or regenerate some responses. AI isn't perfect.
• Open world capabilities will always be limited by the AI model you're using. Free roam and talking to unnamed NPCs will make you depend on your model to make sense of the situations. The more you stray away from the official content, the more improvised (generic) the world will get.
• This isn't Roll20. You can do whatever you wish. You can combine (un)related Lorebooks, characters, monsters... Go homebrew! Run adventures in other systems. Run them without a system. Turn story NPCs into Character Cards. You are only limited by your imagination.
• It isn't unique. Six months into this project, AI DM platforms are popping up left and right. Go check them out. The unique thing here is that you can play with published systems (many of which aren't popular at all), published adventures, using popular chatbotting frontends, free of charge.
• TTRPGs are the starting point of the project. They represent a challenge both for me and the LLM, but they are not the final frontier of chatbotting. AI GM doesn't need tabletop rules to tell scripted stories. Tabletops add structure for challenging the user. Rolling dice is fun. Tabletop systems come with their mystique, you want to take part in the very specialized and niche hobby you're likely locked out of by not being born in specific time and place when they were accessible.
• Limited to tabletops: any literary form can be adapted into Lorebooks for chatbotting purposes. Novels, plays, movie scenarios, comics, and who knows what else can be adapted just as well. And yes, you can put tabletop rules on top of that. AI will always try to cooperate. In the end, you're playing make believe with a make believe companion.

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Installation Guide

0. Check out much better SillyTavern guides than mine such as: onrms, sukino, RAGs
   Keep in mind that using popular Chat Completion Presets such as MarinaraSpaghetti, Ashuotaku, JB Writing Style is perfectly fine. The World Info/Lorebooks are the only essential resource made by me.
   I use Gemini to play and create lorebooks. Consult the guides to learn how to set it up.
1. Install SillyTavern
2. Download the files from MEGA:
   System-Agnostic Game Master preset and character card are the only ones actively supported by me at this point. The others are there just for archival purposes.
3. Open SillyTavern, start importing:
   Chat Completion Preset::

   Click AI Response Configuration (icon with three sliders).
   Click Import Preset (icon representing document with an arrow pointing at it).
   Select the .json file, preset from the system you wish to import.

   Character Card::

   Click Character Management (icon looks like ID card)
   Click Import Character From File (icon representing document with an arrow pointing at it).
   Select .png from Character Card folder.

   UI Theme::

   Click User Settings (icon looks like a man with a cogwheel)
   Import a theme file (icon representing document with an arrow pointing at it).
   Select .json from UI Theme folder

   Background::

   Some systems have a custom background image. This is how you can import them:
   Click on Change Background Image (icon looks like a photo of a mountain)
   Click on the huge + icon
   Select the background image from the UI Theme folder

   Quick Reply Sets::

   Quick reply is a handy ST extension which allows you to make buttons for quick commands. I've made buttons for making the AI think of some use for your character's attributes when you feel stuck.
   Click on Extensions (icon looks like building blocks)
   Make sure these options are checked: Enable Quick Replies, Combine Quick Replies, Show Popout Button (On Desktop)
   Click Quick Reply drop down menu
   Click on Import quick reply set button (icon representing document with an arrow pointing at it), import .json from the Quick Reply Set folder
   Click on Add quick reply set button (+ icon) right next to Global Quick Reply Sets
   Check the Show buttons mark, uncheck when you want to load another Quick Reply Set

   Vector Storage::

   Click on Extensions (icon looks like building blocks)
   Click on Vector Storage drop down menu
   Make sure the following is selected: Vectorization Source: Google AI Studio, Vectorization Model: embedding-001

   If you get errors after sending messages, you should change embedding-001 to text-embedding 004!

   Check Include in World info Scanning
   Check Enable for World Info
   Check Enabled for all entries

   Lorebooks::

   Click on World Info (icon looks like a book)
   Click on Import World Info (icon representing document with an arrow pointing at it).
   Select the .json files from the World Info folder.

4. Change Global World Info/Lorebook activation settings to: Scan Depth = 0, Budget Cap = 0, Max Depth = 0, Context% = 25, Min Activations = 0, Max Recursion Steps = 0, enable the following: Include Names, Recursive Scan, Match Whole Words, Alert on Overflow, change Insertion Strategy to: Global Lore First

5. Activate the lorebooks you wish to play with.

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Character Creation

Each tabletop game needs a player character defined by a character sheet. It is the first thing you should do once you boot the tabletop session.
Here are methods you can create a character.

Quickest Way

Tell the Referee something like:

Generate me a character sheet using stats you deem the most useful.

And add some details such as:

Name my character 'Anon', he is a male Human Fighter who fights with longswords.

DIY Way

Tell the Referee you'll roll for your own stats and go step by step.

I want you to guide me through character creation in full detail. Tell me what I need to roll for.

This may take several steps to finish, but your character will be more unique. To roll yourself, type something like 'roll 3d6' in your browser's search bar then report the result to the Referee or roll the dice in real life if you have any.

Copycat Way

Tell the Referee you want a character just like some already existing popular character.

Generate a character sheet for a character just like {Drizzt Do'Urden/Patrick Bateman/Sonichu}

Hairdresser Way

Tell the Referee you want a character based on the image you'll send. Click on 'Extensions' (magic wand icon) then 'Attach a File' (clip icon), then send the image together with a message like this:

I want you to generate a character with a character card inspired by the image I'm sending you.

Persona

Finally, you'll want to create a Persona for your character so you may use it in future games.
Edit (pencil icon) the reply with the character sheet and copy-paste it inside your Persona in Persona Manager, Create screen.
Now your character will become reusable. If you want to play that character in another tabletop RPG system, simply load the new system and its lorebooks, then tell it to rework your character into this system.

I want you to rework my character to the current tabletop system.
My character is a Dungeons and Dragons character and I want you to adapt him into a RuneQuest Classic character.

...And always tell your Referee to double-check (triple-check even) if the information from the character sheet is correct. The first sheet it gives you is almost certainly inaccurrate. This is an innate LLM problem and cannot be patched out at the moment.

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Fun things to do with AI

• Relax, nobody's watching you. It's okay to do whatever you wish.
• Tell the AI you want to roll your own dice, so either roll using an app or even better: your physical dice. The game will feel more intense, the way it's meant to be played.
• Create custom player characters!
  • Tell the AI to turn your Persona into a playable character with a character sheet.
  • Try out those gimmick characters you wouldn't dare playing in a real campaign.
  • Tell the AI you want to play as a random mob from the dungeon.
  • Or play as the BBEG!
  • Dare to play an evil character, you might be surprised evil is more than murderhoboing.
  • Give up on your quest and embrace the simple life.
• Create custom companions!
  • Make a lorebook for your companion characters.
  • You can reuse your player character to act as a companion later.
  • Or you can tell the AI to adapt an established character. Why not bring Tony Soprano or Bree Van de Kamp with you on your next adventure?
  • Copy the character sheet of the character you'd love to carry over to another game into a WI entry.
• Play the adventure modules.
  • Or try free roaming.
• Can't decide what to play?
  • Read the 0: Readme WI entries for non-spoilerish adventure trailers and sourcebook overviews.
• Stuck?
  • Take a peak at the lorebook. Meta-entries can serve as a walkthrough if you don't care about spoilers.
• Test your own adventures before you run them with real players.
  • Attach and send them to the chatbot or just RAGs it.
  • You can even enable Web Search and send links to YouTube videos of people playing, borrow their ideas.
• Advance your player characters.
  • Play the game in order to gain experience, gear, and money.
  • Update your character sheet to reflect your progress. You can bring those over to future chats.
• Mix and match different systems.
  • Nothing's stopping you from running D&D adventures with FATE or Call of Cthulhu with SMT Devil City Tokyo 200X.
  • For example, Interlock Unlimited is a system designed to override established systems.
• Edit the lorebooks to suit your needs!
  • Don't want to play the main quest? Disable the Meta-Scenario:/Adventure:/Module:/Hook: and Event: world info entries.
  • You want to carry over the consequences of your actions to some future playthrough? Write down the changes in the relevant entries.
  • Hate the rules? Disable or rewrite them.
  • Add your homebrew rules.
• Make your own lorebook in order to keep track of your favorite NPCs, locations and lore. You can bring them over to any future game.
• Game is too hard or easy?
  • Just order the AI to make the game easier or harder. See if it listens.
• Bored? Cheat.
  • Order the AI to enable God mode.
  • Give yourself infinite money, health, and unlimited ammo.
  • Fly, teleport, shapeshift, become invisible, turn everyone into clowns.
  • Try finding every way possible to break the game.
• Once again: relax, AI is only as fun as you believe it to be. Taking it too seriously will only leave you hurt and disappointed.

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Tabletop RPG Systems

Advanced Dungeons & Dragons 2nd Edition

Post-Gygaxian era of D&D, chosen for adaptation thanks to its overwhelming amount of published content, second only to 5e.

Core

Always have the following lorebooks enabled in order to play:
Core::

Player's Handbook
Monstrous Manual
Dungeon Master's Guide

Handbooks::

Complete Fighter's Handbook
Complete Psionics Handbook
Complete Thief's Handbook
Complete Wizard's Handbook

Dark Sun

The edgy child of 2e D&D. I've read the first novel and it's surprisingly non-edgy. It's time to change that. Go wild in post-apocalyptic D&D setting where magic is outlawed and demihumans are savages.
Core::

Dark Sun: Campaign Setting

Supplements::

City-State of Tyr
Slave Tribes

Adventures::

A Little Knowledge
Freedom

Forgotten Realms

Forgotten Realms: Campaign Setting

Greyhawk (1e)

Gary Gygax's original setting for D&D, ported from 1e sourcebooks and adventure modules. Compatible with 2e.
Core::

The World of Greyhawk (Boxed Set)

Adventures::

The Village of Hommlet
Temple of Elemental Evil
Queen of Spiders
The Lost Caverns of Tsojcanth
Against the Cult of the Reptile God

Planescape

As seen in Planescape: Torment. Characters live in a Bespin-like doughnut-shaped purgatory connected to all planes.
Core::

Planescape: Campaign Setting
Planewalker's Handbook
In the Cage: a Guide to Sigil
Uncaged: Faces of Sigil

Supplements::

Planes of Chaos

Adventures::

Doors to the Unknown
Planes of Chaos adventures
the Eternal Boundary
Well of Worlds
Tales from the Infinite Staircase

Ravenloft

Core::

Domains of Dread
Van Richten's Guides (Vampires, Werebeasts, Created, Ghosts, Liches, Ancient Dread, Fiends, Vistani, Witches)

Adventures::

Feast of Goblyns
Ship of Horror
Touch of Death

Call of Cthulhu 6th Edition

Unspeakable horror. It's 1920s and electricity isn't a standard yet.

Core

Core::

Core Rulebook

Supplements::

Investigator Weapons, Vol. 1
Investigator Weapons, Vol. 2

Adventures::

Dead Man Stomp
the Edge of Darkness
the Haunting
the Madman
Tatters of the King
Strange Aeons I (Blood Moon, the Garden of Earthly Delights, the King of Shreds and Patches)

Delta Green

You work for the glowies in 1990s. Strangely optimistic snapshot of pre-9/11 conspiracies and worldview. Y2K is about to blow, I hope you're ready.
Core::

Delta Green (CoC6e)

Supplements::

Countdown
Eyes Only
Targets of Opportunity

Adventures::

Convergence
Puppet Shows and Shadow Plays
the New Age
A Victim of the Art
Dead Letter
Night Floors
a Night on Owlshed Mountain
Artifact Zero
Holy War
Targets of Opportunity adventures: Black Cod Island, the Cult of Transcendence, the DeMonte Clan, the Disciples of the Worm

Cyberpunk 2020

The system that started it all in this project. Think about all the flashbacks from Cyberpunk 2077 vidya, you know: the good parts of the game. Well, this is it. This is how people imagined 2020s before the Internet became a thing. EU and Japan control the world, Pax Americana never happens. Middle East is uninhabitable, and some African countries are doing great. You have landlines, modems, BBS, dumbphones and fax machines. If you work really hard, you'll be able to purchase flat screen TVs, hi-fi sets, video cameras installed straight inside your eyes, and of course, you can get exotic body modifications turning yourself into full 'borg, catgirl or a dragon.
Core::

Core Rulebook
Listen Up, You Primitive Screwheads!!!
Night City Sourcebook
Night City Map
Reference Book

Reference Book is the awesome fanmade booklet containing the list of all classes, skills, implants, vehicles, and weapons. Load it with other books and the AI will draw canonical stats and rules from it.

Zines (Punk '21 #1 #2, Interface Vol.1 #1-4, Interface Vol.2 #1-2, Input/Output, White Wolf Magazine)

Zines lorebook has Compatibility: entries for Call of Cthulhu and Vampire: the Masquerade, turn them on manually

Supplements::

Eurosource Plus
Home of the Brave
Pacific Rim
Live & Direct
Deep Space
Rockerboy
Protect & Serve
Solo of Fortune 1-2
Rough Guide to the UK

Gear::

Chromebook 1-2
Chromebook 3-4

Adventures::

Core Rulebook Adventures
Arasaka Brainworm
Deep Space Adventure - Red Conflict
Near Orbit Adventure - Child's Play
Eurotour
Land of the Free

Interlock Unlimited

Interlock revised, repaired, and re-examined by R. Talsorian Games enthusiasts from http://datafortress2020.com.
Alternative Interlock system for Cyberpunk 2013, 2020, Cybergeneration, Gundam Senki, Mekton II and Zeta, and Teenagers From Outer Space.
Mostly compatible with Fuzion system games: Cyberpunk V3, Bubblegum Crisis, Champions: the New Millennium, Artesia, Guardians of the Universe, Lightspeed, Sengoku, Usagi Yojimbo, Teenagers From Outer Space V2, Dragon Ball Z, Victoriana.

Dark Ages (WIP)

World of Darkness in Middle Ages.
Core::

Dark Ages: Vampire

Supplements::

Europe

Adventures::

Bitter Crusade

Dungeon Crawl Classics

DCC Core

The most famous OSR system. Featuring Luck attribute.
Core::

DCC Core Rulebook

Adventures::

Sailors of the Starless Sea

DCC Dying Earth

A science fantasy world by Jack Vance. D&D's magic is called Vancian magic after him. Basically it means a person can only keep so many spells in mind at once. Set in the 21st aeon of Earth. Fan favorite DE characters such as Cugel the Clever and Liane the Wayfarer inspired the chaotic evil concept in alignment charts. Technology is viewed as magic, everyone who's someone is looking after powerful artifacts of forgotten times. DE has obviously inspired all Western TTRPGs, and even some games like Morrowind and cartoons like Adventure Time.
Core::

Casebook of Arcane Apocrypha (CAA)
Intimate Anatomy of Several Creatures and Personages of the 21st Aeon (IASCP)
The Player's Libram (PL)
The Primer of Practical Magic (PPM)

Settings::

The City of Ampridatvir
The City of Kaiin
The World of Jangk

Adventures::

Donjon of Henniethe the Convokateur
House Kavanse (Holbrook)
Manse of Panderleou, Collector of Artifacts
Manse of Yasbane the Obviator
The Museum of Man

Dungeons & Dragons 3.5 Edition

Most fa/tg/uys will tell you it's the last good edition. Others will tell you Pathfinder is better. Fortunately, I've adapted both.
Core::

PHB
PHB Spells
PHB2
MM1

Supplements::

Book of Vile Darkness

Adventures::

PHB2: the Gates of Dawn
PHB2: the Necrotic Cradle
the Shackled City

Elric!

Stormbringer edition from mid-90s. Backwards compatible with previous editions. Featuring Elric of Melniboné, the Eternal Champion. Most famous for being the source of inspiration for Dark Elves, Drizzt, Valyrians, Vampire Hunter D, the Witcher, as well as alignment system from D&D.
Core::

Core Rulebook
Atlas of the Young Kingdoms

Adventures::

Elric! Scenario - the Weight of Doom
Atlas of the Young Kingdoms scenarios
the Curse of Chardros

ElfQuest

Core::

Boxed Set
Companion
Sea Elves

Adventures::

Boxed Set adventures
Beyond the Frozen Mountains
Elf War
Sea Elves adventures

Fallout

Legendary franchise conceived by Timothy Cain. Inspired by a Canticle for Leibowitz, Lord of Light, Book of the New Sun, Gamma World, GURPS, the City of Lost Children. What if art deco retrofuturistic world got wiped out by nuclear fire on Saturday, October 23, 2077?

Fallout 2d20

The official Fallout tabletop system. Stuck in Fallout 4's setting for better or for worse.
Core::

Fallout 2d20

Adventures::

With a Bang, or a Whimper

Fallout Vault Archives PnP

A wonderful fanmade tabletop system from No Mutants Allowed forum. Tries to tie in Interplay's Fallout and Bethesda's Fallout. Features almost every creature from every game. Comes with a tabletop adaptation of Van Buren, with some changes to unify the timeline of Fallout 2 with Fallout: New Vegas.
Core::

Fallout Vault Archives PnP Guide
Overseer's Guide
Mutant Manual (+ Home on the Wastes + the Monster Mash + Operation Free Will)

Adventures::

Van Buren Worldbook

FATE

The antithesis to D&D-inspired systems: D&D was designed for tournament play, where the rules were strict and impersonal, perfect for DMs to kill off strangers' characters. FATE on the other hand is designed for relaxed, therapeutic oneshots. This is a remarkably simple and versatile system where characters have their custom skills and abilities. There's little advancement and lots of respeccing before the next adventure.
Anything can be summed up by modifiers ranging from -4 to +4. Instead of relying on established rules, the GM invents the gameplay on the spot depending on the vibes.
"Simple" sounds like a dirty word in gaming, but it's really not that bad. I take it there's a fair chance you can pull this system off even when running local models. If you'd like to turn anything into a quick TTRPG session, then this is the system for you. My piece of advice is just RAGs anything you like and have a good time with FATE.

FATE Core System 4.0

Core::

Fate Core System

FATE Accelerated

Core::

Fate Accelerated Edition

GURPS 3e

A complicated, yet universal TTRPG system. Can be used to run anything. Basis of many lesser known TTRPGs.
Core::

GURPS 3e Core Basic Set

Supplements::

GURPS Compendium I
GURPS New Sun

Jamais Vu

Fanmade Disco Elysium TTRPG.
Core::

Jamais Vu

Homebrew::

Sacred and Terrible Air

Kult: Divinity Lost

Edge, Eddge & Edgy. Demiurge, the world is a lie. Dirt, violence, mental illness and BDSM. Think Videodrome, Hellraiser, Dark City.
Core::

Core Rulebook

Adventures::

La Cena
Oakwood Heights
the Atrocity Exhibition
Laraine Estate
the Summit

Mage: the Ascension 2nd Edition

Core::

Core Rulebook
the Book of Shadows
the Book of Chantries

Supplements::

Cult of Ecstasy
Dreamspeakers
Guide to Technocracy

Adventures::

the Loom of FATE

Maid RPG

The first Japanese TTRPG ever translated to English.
You play as maids or butlers serving your master. The game is built around many anime tropes and it operates by anime logic.
This is the second attempt at adapting it. The first one got scrapped same as the first Cyberpunk 2020 adaptation.
Core::

Core Rulebook
Extra Scenarios

Over the Edge

This time I bring you Over the Edge, the underground TTRPG from the 90s which takes place in a funky island setting. The game is mechanically really simple. Just jump straight in with your favorite character and play.
Think of those 'prophetic' lluminati: The Game of Conspiracy cards, except in a sandbox roleplaying game. The Illuminati gather on Al Amarja, the Mediterranean island.
You get this full open world (not unlike the Night City) inhabited by hundreds of NPCs who may or may not be part of the global conspiracy. Think of Jagged Alliance 2's Arulco, but instead of mercs, you'll be Martin Mystère or Sterling Archer.
In fact it's worse than that. Think of a GTA island where all NPCs are Strangers and Freaks, think of portable Sims 2 games. No matter how you approach OTE, you're getting LYNCHED.
Core::

Core Rulebook 2e
Players' Survival Guide
At Your Service
Cloaks
Friend or Foe
Weather the Cuckoo Likes
Wildest Dreams

Adventures::

Wildest Dreams adventure - Kill John Doe
Airwaves
Forgotten Lives

Paranoia 25th Anniversary Edition

Mongoose's tabletop take on dystopian societies, obviously inspired by We, Brave New World, 1984, Logan's Run, This Perfect Day.
I've never played Space Station 13, but I imagine it's something like this, except mixed with Logan's Run.
Core::

Troubleshooters

Adventures::

Robot Imana - 665 - C
the Quantum Traitor
Alice Through the Mirrorshades (Connecting Cyberpunk 2020 and Paranoia)
Flashbacks Redux
Flashbacks I & II

Pathfinder 1e

As seen in Pathfinder: Kingmaker and Pathfinder: Wrath of the Righteous. D&D 3.5e's step-sibling. Featuring Golarion, a great kitchensink setting and robust rules system.
Core::

Core Rulebook
Bestiary 1
Advanced Class Guide
Advanced Player's Guide

Locations::

Inner Sea World Guide
City of Strangers

Supplements::

Goblins of Golarion

Adventures::

We Be Goblins!
We Be Goblins Too!
We Be Goblins Free!
We B4 Goblins!
We Be Super Goblins!

Adventure Paths::

Rise of the Runelords
Curse of the Crimson Throne

Rogue Trader

As seen in Rogue Trader by Owlcat. Space Marines in space without Space Marines, you play as corsairs.
Core::

Core Rulebook

Supplements::

Into the Storm
the Kronus Bestiary

Adventures::

Into the Maw
Exploit Star Cluster SH-01-0151
Requiescant in Pace

RuneQuest Classic

As seen in King of the Dragon Pass. Bronze Age-inspired fantasy set in Glorantha, one of the most intricate fantasy worlds. TES III: Morrowind's devs were inspired by this game.
Core::

Core Rulebook

Supplements::

Cities
Cults of Prax
Cults of Terror
Pavis City Guide
Sun County (3e)

Adventures::

Apple Lane
Duck Pond
Snakepipe Hollow
Griffin Mountain
PCG Adventure - Burglary at Raus' House
PCG Adventure - the Cradle
PCG Adventure - Welcome to the City

RuneQuest: Roleplaying in Glorantha

The latest, 7th (some say 4th) edition of RuneQuest. Set some 15 years after Classic/2e. Compatible with Classic.
Core::

Roleplaying in Glorantha
Glorantha Bestiary
the Glorantha Sourcebook 2e
the Red book of Spells
Weapons & Equipment

Supplements::

the Lunar Way

Adventures::

Six Seasons in Sartar

Shin Megami Tensei Devil City Tokyo 200X

SMT in TTRPG form, insanely detailed. Features hundreds of demons and notable humans of various SMT entries. Mostly inspired by SMT 1, 2, Devil Summoner, Soul Hackers and Persona 1, 2. It has several official timelines: high school (solving mysteries), Tokyo 200X (normal timeline), martial law (hell is breaking loose), apocalypse (during SMT 1's timeskip) and post-apocalypse (SMT's Tokyo Millennium). Low-level play is like Call of Cthulhu, you face overwhelming foes. You get awakened at level 5 and that's where the demon summoning game begins!
Compatible with BRP systems! I've included the Compatibility: WI entries in the lorebook. Why not play Delta Green with SMT logic and actually stand a chance against Cthulhu? He's just another demon after all. You wish to play Elric? He has a statblock. You want to sacrifice the souls of your friends to Arioch? Don't worry, he's already a demon featured in SMT. BRP games are just waiting to be soul hacked by demon summoners!
Core::

Core Rules
Dark Profile
Diamond Realm
Makai Sefirot
Tokyo Millennium

Adventures::

Time to Awaken
Dark Profile Adventures: Close Encounter of the Third Kind, Here kitty, kitty, kitty..., Hunting a Messiah, Ice Cream Revolution, In Search of the Legendary Card, Like a bird, Peter Pan in the City, Princess Takiyasha, Q’s Invitation, The Battle Field, The Fairy’s Lover, The Hee-Ho Race, The Sound of Military Boots, The Stolen School, The Strongest Man
Arachne's Labyrinth
A Fateful Encounter

Compatibility Layers::

Call of Cthulhu 6e
ElfQuest
Elric!
RuneQuest Classic
RQG

Tékumel

World's third TTRPG. It takes place on a distant planet colonized by humans in distant future. Plays more like a life sim than heroic adventure. The setting is a lot like RuneQuest, except inspired by pre-Columbian Americas rather than European Bronze Age. If Dungeons and Dragons plays like NetHack, Tékumel plays like Caves of Qud. The entire atmosphere is reminiscent of Gene Wolfe's sci-fi novels despite this game being older. Expect things you see in Fifth Head of Cerberus and BotNS. Think of Lord of Light or Hard to Be a God, but Mesoamerican.
Tékumel has a weird habit of switching back and forth between game systems, but SillyTavern Adaptations are prepared for it!

Empire of the Petal Throne

Third TTRPG ever released. The OSR edition of Tékumel with mechanics heavily inspired by OD&D.
Core::

Empire of the Petal Throne

Swords & Glory

Second system featuring the world of Tékumel. More refined than Empire of the Petal Throne. You have to choose between the more OSR Empire of the Petal Throne system or Swords & Glory Player's Handbook more simulationistic system.
(Swords & Glory Source Book 1 can be used with Empire of the Petal Throne)
Core::

Swords & Glory Source Book 1
Swords & Glory Player's Handbook

Adventures on Tékumel

A strange add-on or possibly its own system built around solo play since the devs knew you'll never find a group to play with. Role play relying on roll play. Expect a lot of 1d100 rolls. Very random, but interesting system. You play your characters from conception until they're old enough to venture forth.
(Adventures on Tékumel are fully compatible with Empire of the Petal Throne system, or they may be played independently, but have no fear, the AI GM can run it with Swords & Glory Player's Handbook system too.)
Adventures::

Growing Up on Tékumel
Coming of Age in Tékumel::
Adventure A - Coming of Age in Béy Sü
Adventure B - The Army
Adventure C - The Priesthood
Beyond the Borders of Tsolyánu::
Adventure D - Livyánu
Adventure E - Hunting
Adventure F - Caravan
Adventure G - Penóm

Tribe 8

Tribe 8 is a magnificent piece of work you deserve to experience, at least in this AI TTRPG form.
It's After the End, but the demons invaded our world, changing it by introducing magic and living avatars of the extradimensional gods.
I imagine this as the Tribe (NZ TV show which came out a year after T8. Coincidence? I think not.), but much more grimdark since it wasn't the coof that killed off humanity. Oh, and most people are infertile, so survival of the species hangs by a thread.
The Quebecois organized themselves in 7 tribes, headed by demigods (think Almsivi), but you got kicked out and now you have to fend for yourselves, becoming Tribe 8.
Demonic bad guys Z'bri are not Chaos from WH, they're the Daedra. Another great feature is that this system comes with a complete year by year campaign made up of cycles. You'll get to play out Tribe 8's story from beginning to the end and that's it!
Core::

Tribe 8 Core Book
Companion
Weaver's Assistant

Supplements::

PHB
Horrors of the Z'bri
Vimary
Into the Outlands

Adventures::

Serpents: a Story of the Eighth Tribe
Companion adventures: Sangreal, St. Christopher and the Croatan
Weaver's Assistant adventure: the Enemy of My Enemy
Cycle 1 - Children of Lilith

Vampire: the Masquerade 2nd Edition

As seen in Vampire: the Masquerade: Bloodlines by Troika Games. Experience what it was like not to be a normie in early 90s. Prepare for the permanent crisis, Gen X-style.
Core::

Core Rulebook
Vampire Players' Guide

Locations::

Chicago By Night
Chicago By Night 2nd Edition
Ghouls: Fatal Attraction

Supplements:

WoD - Gypsies
WoD - Mummy 2e

Adventures::

Baptism By Fire
Ashes to Ashes
WoD - Gypsies Adventures: Bloodlust, Children of Pain, One Enchanted Evening, Reckoning, the Madman's Knife, the Threads of Time, Where the Wyld Things Are
Giovanni Chronicles I

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Which TTRPG systems and sourcebooks should I adapt? Vote here: https://poal.me/ifre20 (I'm way more likely to adapt sourcebooks and adventure modules you say you want. New systems take more time.)
See ya in /aicg/ & /sffg/!