The Labyrinth of Knossos
A procedurally-assembled megadungeon for six players at average level 9
Daedalus was commissioned to build a prison and delivered a question instead.
The tribute still comes. Once a year the bronze gate under the palace is drawn up, eight young people walk through it, and the gate comes down before the last of them has finished turning round. Everyone on Crete knows what is supposed to be waiting for them.
Nobody on Crete knows what else is down there.
There is a bull-headed thing in a maze under Knossos, and every child in the Aegean could tell you that much. This is the rest of it — the part the story leaves out. A hall with nine identical bronze doors in the far wall, where the two-hundred-year-old fresco on the side walls has been quietly naming the right one for anyone who reads it, and a brazier by the entrance that is still warm. A cold larder where a one-eyed thing the height of two men works a cleaver down through a joint with the patience of somebody who has all night, and three more of its kind throw knucklebones in the next alcove and argue about the count. A niche in a corridor wall the size of a bread oven, where nine small things have been laid out in a line, quite clean, on top of two centuries of fused offerings, by somebody who is still down here counting her days.
Your players are going in. The question this book is built to answer is not whether they can kill what lives at the centre. It is whether they can get out again, and what it costs them.
Welcome to the Labyrinth
The Labyrinth is not a corridor with a monster at the end of it. It is a building, and it is still in use.
Someone lights the braziers. Someone brings in the barley and the oil and takes the empties back out on a cycle, which means there is a way out that is not the gate, which means the party's problem is solvable. The Cult of the Thread keeps the shrines and the routes. A cyclops named Ankos keeps a forge, and will mend what your party brings him, and will not be hurried or cheated. Somewhere further in, a twelve-foot bronze bailiff is still enforcing the house rules of a master who has been dead for a century, and will hear an argument before it decides.
Twenty warbands live down here — hunting beasts, spiders, a drakon nest, a Lamia's court, salamanders working a forge, the automata Daedalus left running — and they dislike each other roughly as much as they dislike your party, which is the single most useful fact a clever table can learn.
Under all of it is something older than Minos's use for it. The maze predates the king who put a monster in it. It has rooms that were never meant to be entered, corridors that arrive somewhere they did not leave, and one finale — The Maze Itself — where the antagonist has no face at all, because it is the building.
The tone is Greek myth played straight and played hard: bronze, salt water, lamp-black, wet stone, bulls, an honest and negotiable pantheon, and violence that costs something. There is no wizard's tower here and no dragon hoard. There is a lot of dark, and there are gods who will make a deal.
The beast is never the point. The way out is the point. Every session in this book ends on an escape, and the escape was seeded in the first ten minutes, before anyone at the table knew it was an ending.
How This Book Works
This is a deck, not an adventure. Nothing here is a plot; everything here is a part, and you assemble the session as your players walk it.
- 12 Beginnings — how the party arrives, and it is rarely their idea. Some strip their gear. Most quietly imply their ending.
- 100 Rooms — the maze itself, rolled on a d100 as the party opens doors. Gauntlets, puzzles, traps, sanctuaries, parleys, lore rooms, and threats they are meant to consider walking around.
- 20 Final Encounters — the thing at the centre, rolled on a d20 when you decide the session has narrowed. Each one is Deadly, most can be beaten without killing anything, and each names one optional boon the party might have picked up hours earlier without being told what it was for.
- 20 Resolutions — the way out, which is the real ending. A thread, a river, a bargain, a forged writ, a flying machine, or the party's own survey notes.
The maze has no map, and that is deliberate. Exits differ in cost and flavour, never in destination: every exit leads to "roll d100 again." Don't draw a floor plan and don't let a room promise what comes next. It's the Labyrinth. It's supposed to be impossible.
The numbers assume six players at average party level 9. That is the only time this book will say so. Every entry with a fight or a check in it carries scaling lines for APL 6, 12, and 15, so a smaller or larger party is a column change rather than a rewrite.
These pages roll nothing. There is no dice roller here, no saved session, no crossed-off numbers, nothing that breaks when you close the tab or open a private window. Randomness lives in your hands. This site is a lookup surface: the die stops, you have a number, and one tap puts that room on screen before the table notices the pause. Room pages live at predictable URLs (rooms/room-042.html, always three digits), which on a phone is the fastest lookup there is.
What a Session Feels Like
One session is one descent, and it is a grind on purpose.
The party arrives — dumped in an arena, delivered as tribute, hired as surveyors, or simply through the wrong door of a tavern in Misthaven. They open a door, and you roll. They spend an evening deciding which fights are worth having, because the maze offers more of them than any party can afford: a Deadly room they sneak past is a win, and the tables are built to reward a party that learns that. Somewhere in the middle they will burn a spell slot they wanted for later, and somewhere after that they will find a sanctuary and argue about whether they can spare an hour.
Nine to twelve rooms in, the corridors narrow. By then the party should be at half strength, and they should have been hearing about their exit for two hours without noticing: a draught, a chalk mark, a body pointing the wrong way, a warden who says the wrong thing about the tide. The Final Encounter is the price of the door. The Resolution is the door.
Then they walk out with a fraction of what they brought, and the session ends on the escape rather than the kill — which is the difference between a dungeon your table remembers and a boss fight they can't place a year later.
Run it once as a one-shot and it is a hard evening. Run it as a campaign and keep your used-room list between sessions: the maze does not repeat itself for a hundred rooms, and the second descent is always the one where the players walk in knowing what it costs.
New Session Checklist
Ten minutes with this list and a handful of dice is all the prep a session needs. The full procedure — the clock, the clue drip, the dials, and two worked example sessions — is on How to Run a Session.
- Pick or roll the Beginning (d12), and read its opening scene once.
- Set the Resolution. Use the one your Beginning implies; otherwise roll d20 after the first room. The players are never told — it arrives as clues.
- Note the party's APL and which scaling column you are reading tonight.
- Roll the Final Encounter now (d20, optional and worth the two minutes), read its boon, and choose the room where you will plant it.
- Decide how long you are playing, and therefore how many rooms: about 6–8 in three hours, 9–12 in three and a half to four, 13–16 in five.
- Set your dials before play: duplicate rerolls, whether a different exit re-rolls the finale, and who rolls the d100.
- Ask the table what nobody wants in the game, and say that "I'd rather not" needs no explanation.
- Have dice and a scratch column — d100, d12, d20 — with a list of rolled room numbers beside your initiative order. Rooms never repeat, and this site does not track them for you.
The Rest of the Book
Before You Start
Some of this deck is harsher than the oneshot library's baseline: captivity, drowning, crushing walls, airless corridors, being eaten. Every entry that leans that way carries a one-line note offering a softer framing, and the room tags flag the intense themes so you can steer around one you don't want at your table.
Take two minutes before the first roll to ask what nobody wants in the game, and say that "I'd rather not" needs no explanation. Then run it hard. The maze is more frightening when the table trusts you.