An AI Dungeon Master for your table

Rossum’s Universal Rhapsode

The Dungeon Master is always ready. Are you?

An AI Dungeon Master that reads your world, runs your game, and never cancels on a Friday night. Forge a campaign from a single idea, gather your party — solo, or up to six players on your local network — and let a living narrative engine turn your choices into legend.

Get it on Steam See it in action

Windows & Linux · Runs offline on your machine · D&D 5e (2024)

Tabletop roleplaying is the best storytelling medium ever invented — and it sits gated behind scheduling six adults and finding someone willing to run the game. Rossum’s Universal Rhapsode removes the gate. The AI handles the prep, the rules, and the improvisation, so everyone at the table gets to play.

No DM? No problem. Play tonight — solo on your lunch break, or co-op the moment your friends log on.

The Living World

An AI that actually knows your world

Most “AI adventures” invent generic fantasy on the spot and contradict themselves three scenes later. Rossum reads your campaign before every line it speaks.

Import lore documents, NPC rosters, maps, and house rules
A retrieval engine surfaces the relevant facts each scene — the tavernkeeper remembers your name, and the villain’s plan stays consistent
Secrets stay secret: the DM reveals only what your campaign allows

The Story So Far reader: a player line, then Dungeon Master narration with an inline Stealth check reading rolled 19, success, and quoted dialogue from two named NPCs. — Plate IThe Dungeon Master calls for a Stealth check in *The Greenskin Conspiracy*.

The campaign gate for The Hollow Crown: the world introduction and opening scene on the left; the party roster with Create Character, Import Character, and Begin Adventure buttons on the right. — Plate IIThe Hollow Crown greets the party at the gate — world intro, roster, and Begin Adventure.

The Forge

Forge a whole campaign from one idea

Don’t have a world yet? Describe a vibe — “a drowned city ruled by a merchant cult” — and the AI authors the rest: the villain, the story beats, the towns, the dungeons, and a cast of NPCs who each know something worth uncovering.

Guided mode — design it together, shaping each piece in conversation
Blind mode — let the AI write a campaign you’ve never read, then play it as a player, spoilers intact
Every forge produces a complete, playable campaign folder — never a broken half-draft

The Table

Roll your own dice

This isn’t a chatbot narrating numbers at you. When the DM calls for a check, you roll.

Player-roll mode — the DM asks, you tap, and the result feeds back into the story. The tabletop feel, intact.
Narrative mode — prefer cinematic flow? Let the DM resolve the dice itself.
House rules, DC reveals, crit-and-fumble flavor, and per-roll visibility — public, private, DM-only, or hidden — for the whole table

The dice tray: a large last-roll result of 8, quick-roll buttons from d4 to d100, common rolls, a custom roll with modifier, and a roll history. — Plate IIIThe dice tray — quick rolls, custom modifiers, a table history.

The Atlas

A world you can see

Graphical maps with zoom, pan, and a fog of war that remembers where you’ve been. Descend from the overworld into a town, then into the tavern’s back room — interiors generate as you enter them, populated and ready to explore.

Overworld map of the Duskmere Reaches: pixel-art mountains, forest, a river crossed by a bridge, roads, villages, a walled keep, and the party’s position marker. — The Overworld

Town map of Thornhaven: houses, a market, and a temple gathered along crossroads. — The Overworld

The Voice

Hear the story

“The lantern gutters. Somewhere beneath the tavern floor, something patient begins to sing.”

— The Narrator · one of 900+ offline voices

A built-in neural text-to-speech engine reads every scene aloud — entirely offline. Distinct, consistent voices for the Narrator, each NPC, and your party, with emotion-aware delivery and ambient audio to set the mood. Close your eyes and let the DM narrate.

Combat tracker in round two: an initiative list with a Goblin Skirmisher at armor class 13 on 3 of 7 hit points and a Goblin Archer at armor class 12, with hit-point bars; the location line reads: the common room of The Broken Flagon. — Plate VRound 2, in the common room of *The Broken Flagon*.

The Party

A table without a missing chair

Host a session on your LAN and bring up to six players together — and nobody has to sit out to run the game.

Players join, build or import a character at the gate, and ready up
The AI narrates for the whole party at once, tracking who did what
Private whispers, hidden rolls, spectator seats, and host migration keep the night running — even if the host has to step away

Also in the book

Characters that travel

Build a hero in the guided creator — species, class, background, backstory — then export them to a file. Bring them into the next campaign at full power, or rebuild them at its starting level. Every scar comes along.

Your rules, honored

Free-form house rules the DM actually obeys, DC reveals, and crit-and-fumble flavor. Built on D&D 5e (2024 rules), SRD 5.2.1, with full combat support.

Saves you own

A campaign is a folder of plain text on your machine. Copy it to back it up, share it, or version-control it. No account, no cloud, no goodbye.

At a glance

The stat block

Players: 1 solo, or up to 6 on LAN co-op
The DM: Autonomous AI — guided or fully blind campaigns
AI options: Local (Ollama / BitNet, offline) or cloud (Grok / Claude)
System: D&D 5e (2024 rules), SRD 5.2.1
Voice: Offline neural text-to-speech, multi-voice
Maps: Graphical, nested, procedurally generated
Your data: Plain-text save folders, stored on your machine
Platforms: Windows & Linux (macOS / Android builds available)

Assemble the party. The Rhapsode is waiting.

Get it on Steam

Windows & Linux · Local AI, no subscription · Your table, your data

Rossums Universal Rhapsode

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