Jewel in the Sky: A Megadungeon with a Twist from Monte Cook

Jewel in the Sky: A Megadungeon with a Twist from Monte Cook

Legendary TTRPG designer Monte Cook, creator of Return to the Temple of Elemental Evil, Ptolus, and more, returns to the megadungeon!
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Started: Tue Apr 21 12:19PM

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This project is part of Cypher Megadungeons, running from April 7th – May 1st, 2026. Learn more

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Header: Soar Into the Skies. Vocurro. The Jewel in the Sky. An eight-mile-long island floating 1000 feet above the distant mountains. It’s famed for the magnificent Crystal Cathedral, and riddled with inveigh mines—source of the precious, gravity-defying mineral that powers airships and so many mystic applications. It’s long been coveted by the powerful and the magical, who over the centuries have built untold catacombs, fortifications, and dungeons on and in this famed floating isle. Vocurro is also home, unknown to all, to the hidden base of the visitors. These strangers from the stars have for years visited Vocurro in secret, posing as natives when it serves their purposes. And they’re equally interested in the strange properties offered only by the mysterious mineral inveigh. Now the visitors have lost contact with their secret base. And over the centuries magic has corrupted technology, and technology has corrupted magic. By anyone’s standards—natives and offworlders alike—Vocurro has become a very strange, and very dangerous, destination. What happens when magic and technology don’t just merge—they collide and corrupt each other? And along the way attract demons from another plane; a shadowy cult with a mysterious agenda; a cabal of powerful figures making Vocurro the nexus of their schemes and plans; and more? Delve into Vocurro's daunting maze in this massive dungeon adventure. Explore its dank and ancient passages, and discover mysteries, riches, and dangers—and loads of surprises. Jewel in the Sky is built for the fun, flexible, easy-to-run Cypher RPG, and fits easily into your fantasy world—or in any space opera sci-fi setting. Because you can…
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Header: Play It Two Ways
Dungeon fantasy or space-opera sci-fi? Jewel in the Sky is two megadungeons in one, because you can play it either way!

Graphic showing an open book, with the words One Elegant Book, Two Ways to Run It with two images--one a with a fantasy party exploring a dungeon, and another with a sci-fi party exploring a different dungeon area.


And no matter how you play it, you'll discover interesting twists that take your players' imaginations to places they've never been.

  • Through what magic might a clever sorcerer turn a simple communication device into a weapon that threatens the entire world?
  • How can unquiet ghosts and fusion radiation possibly exist in the same world—and what happens when they mingle?
  • How does an AI cope when it finds itself abandoned on a planet where magic and spellcraft dominate?
  • How does a lone android survive when the magical energies of a strange new world begin to alter it both physically and mentally?
  • And how does a sleeping god react when these events begin to wake her?

Play Jewel in the Sky as a classic fantasy dungeon filled with strange and unusual discoveries. Or drop it into a space opera sci-fi game, and play as the visitors reclaiming their base on a world unlike any ever encountered. It’s specifically designed to play either way—and to deliver twists and surprises that will make this dungeon crawl a weird, exciting, and memorable adventure!
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Header: An Awesome Book—And an Awesomer Boxed Set!

Subheader: A Fantastic Standard Edition Filled with Great Features
An image showing an example map spread, showing features such as: each area’s key info in a two-page spread—no page-flipping; beautiful illustrated maps throughout the book; easy page references to other locations; short, descriptive text at a glance; loads of visual detail brings the locations to life; and only the information you need, quickly accessible.


We love great products here at Monte Cook Games. Our books aren't just creative, inspiring, and strikingly beautiful—they're also amazingly usable, filled with clever and innovative features that make them a joy in play. They're well-organized, heavily indexed, and lavishly cross-referenced with callouts that put relevant info at your fingertips, no matter where you are in the book.
“This book is so beautiful, it makes me want to weep.” —Backer comment about our most recent release, The Darkest Woods

The standard edition of Jewel in the Sky is a hefty hardcover book (and PDF) optimized for easy, quick use in prep and especially at the game table. It contains the entirety of the Jewel in the Sky mega-adventure for Cypher—an exciting, memorable campaign in a book filled with conveniences that make running this rich, complex adventure a joy!

A graphic button that says Get a sneak peek at Jewel in the Sky

Want to have a look? You can take a peek at a sample section. (This is from the current manuscript, and isn't final text. But you'll get a sense of how each section is laid out to maximize utility and minimize page-flipping.)

An image showing a strange being that might be a creature, or might be a person in a weird spacesuit, next to a second image of what appears to the ghost of a spindly woman with a basket full or ghost children on her back.

Subheader: An Even More Amazing Special Edition!
An image showing the box set contents, including: the standard edition hardcover; a poster map; a dozen+ additional map sheets; a bunch of evocative handouts; dozens of creature and cypher cards; character sheets for the whole party—both fantasy and sci-fi versions; the Twin Clocks Timer; a detailed bestiary; a GM notebook; and the premium magnetic-closure box.

The exciting encounters and compelling story arc of Jewel in the Sky will be the stuff of legends in your gaming group. But shouldn't the entire experience to be just as cool?
“A Smithsonian-level treasure with the ambition and craftsmanship of a Fabergé egg.” —Chris Mahon, reviewing the Invisible Sun Black Cube on Medium

We're making an awesome boxed set edition of Jewel in the Sky exclusively for you, our backers of this campaign. It won't be widely available any other way, so you don't want to miss this. We'll take everything that makes the book awesome, and build from there, including:

  • The content of the standard edition, split into three separate books for easier reference
  • A poster map
  • A dozen+ additional map sheets
  • A bunch of evocative handouts
  • Dozens of creature, cypher, and intrusion cards
  • Character sheets for the whole party—both fantasy and sci-fi versions
  • The Twin Clocks Timer

...all in a beautiful and sturdy box!
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Our vision for this goes even further. Help us reach stretch goals to expand and upgrade this awesome boxed set!

Stretch goals!
Stretch goals! Unlocked at 750 backers: More maps in the box! Unlocked at 1000 backers: More handouts in the box! Unlocked at 1150 backers: Mini-bestiary in the box! Unlocked at 1225 backers: More cards in the box! 1300 backers: Box upgrade! 1375 backers: Bigger maps! 1475 backers: GM notebook! 1550 backers: Another poster map! 1625 backers: More cards! [[LOCKED]] 1725 BACKERS: SIDE QUESTS! A new component! We’ll add a booklet of side-quest adventures related to the Jewel in the Sky plotlines to the boxed set. See update 12 for details!
An illustration showing a group of fantasy characters in an expansive room. They’re carefully making their way toward a red, glowing reliquary.
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Header: Monte's Return to the Dungeon

Monte Cook (he/them) is a legend in the world of dungeon design.  With an RPG design career filled with the credits of famous megadungeons, including (among many others) Return to the Temple of Elemental Evil, Ptolus, Dungeon-a-Day, and, more recently, The Darkest House. Now he's delving back into the dungeon for the first time in years, bringing to bear all the innovation and creativity he's honed through projects like Numenera, Invisible Sun, Stealing Stories for the Devil, Cypher, No Thank You, Evil!, and The Magnus Archives Roleplaying Game—and, further back in his storied career, D&D 3rd Edition, HeroClix, Arcana Evolved, a number of Planescape products, Call of Cthulhu d20, Monte Cook’s World of Darkness, and (going way back!) products for Rolemaster and Champions.
“It’s the most detailed and best-presented sourcebook ever.” —Matt Colville, commenting about Ptolus on reddit

Image of Monte Cook, with art of a group of adventurers crossing a rocky path.


Monte is working closely with our Art Director, Bear Weiter (he/him), to make Jewel in the Sky as astonishingly easy on the GM as it is beautiful and striking. If you're familiar with MCG's many games, you know how we cherish RPG products that go above and beyond not just in presentation, but also in usability. Bear's genius brought us the amazing innovations in The Darkest House and The Darkest Woods, the elaborate amazements of the Invisible Sun Black Cube (quite possibly the most deluxe and feature-packed RPG product ever made), and the clear usability of products ranging from the Numenera Starter Set to No Thank You, Evil!

Image of Bear Weiter, with art of a group of adventurers exploring a strange cave.


Monte and Bear are backed up by the illustrious and award-winning design team of Sean K. Reynolds (he/him), Shanna Germain (she/her), and Bruce R. Cordell (he/him), along with Graphic Designer Javier Beltrán (he/him), whose visual talents shine in products like The Devil's Dandy Dogs and The Weird. Rounding out the team that will bring you Jewel in the Sky are Managing Editor Teri Litorco (she/her), who wrangles the words and projects with the help of Associate Editor Dominique Dickey (they/them), and Kate Evans (she/her), Jennifer Walls (she/her), Tammie Ryan (she/her), Olivia Ryan (she/her), and Charles Ryan (he/him), who interact with our fans and customers and keep the business rolling along smoothly.

Image of Sean K. Reynolds, Shanna Germain, Bruce R. Cordell, Javier Beltrán, Teri Litorco, Dominique Dickey, Kate Evans, Tammie Ryan, Olivia Ryan, Charles Ryan.


Monte's been at this for decades, and Monte Cook Games has been publishing highly praised, award-winning, innovative RPGs since 2012. We pride ourselves on works that are imaginative, fun, easy to play and GM, and beautiful—and crowdfunding campaigns that, for well over a decade now, have consistently delivered big and on time. We’re a small, values-driven company, but we deliver big!

Join the incredible community of Cypher gamers on the Cypher Unlimited Discord.

An illustration showing a group of characters as they traverse a fragmented and dangerous path across a large void in space. They're slowly making their way to a floating structure.
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Header: Need Cypher?

Jewel in the Sky is the first major dungeon built from the ground up for Cypher, the popular, award-winning RPG system that's fast, flexible, and incredibly easy on the GM. If you're not already a Cypher fan, great news: we have pledge levels just for you that include the Cypher corebooks at a backers-only special price.

And here's some even better news: You're about to discover your new favorite game!

Cypher is built for the fun, fast-paced campaigns just itching to burst from your imagination and onto your game table. Players love their vivid, memorable characters that are easy to build, fun to play, and never bogged down in needlessly complex mechanics. GMs love running fun, fast-paced adventures and campaigns that bring their worlds to life without having to kludge the rules to make them fit.

And because it's so flexible, you can use Cypher to play Jewel in the Sky as a classic fantasy dungeon crawl, or an amazing sci-fi mega-adventure, with no kludges or special rules. It just works!

An image of the Cypher slipcase set, highlighting the following features: fast-paced, fun gameplay moves quickly; built in narrative tools help forge the story you want to build;  you never have to fudge rolls, kludge rules, or railroad players to get a great story; easy to prep and run; character generation is fast, fun, and concept-driven; flexible—play fantasy, sci-fi, superheroes, cyberpunk, horror, you name it!; encourages players to pursue subplots and help develop great campaigns; mechanics stay out of the way—your imagination is free to focus on your amazing ideas!; fast, effortless, and keeps your game focused on narrative and choices rather than crunch.


If you can imagine it, Cypher makes it easy!

The new edition of Cypher launches this summer. If the corebooks are among your rewards, we'll deliver them as soon as they're available—months ahead of Jewel in the Sky—so you can start running the campaigns of your dreams right away. In the meantime, you can download the Cypher Preview and get a taste of the game right now!

Download the Cypher Primer! Click Here.


An illustration showing a ornate dungeon hall, with archways, columns, and multiple levels. A group of characters approaches a dias with a glowing center, flanked by huge statues.
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Header: Adventuring on VTT

An image of Jewel in the Sky on VTT


Play entirely online? Prefer to play Jewel in the Sky on your favorite VTT?

The VTT implementation of Jewel in the Sky includes complete compendium access to the book along with maps, interactive character sheets for both fantasy and sci-fi campaigns, tokens, and other assets. It does not include the Cypher rules, which will be available separately following the launch of the new edition this summer.

There are two ways to get Jewel in the Sky on VTT:

  • If that's all you want, there's a pledge level just for you. Pledge at the JEWEL ON VTT level.
  • If you want VTT access plus the beautiful deluxe boxed set or the physical book, pledge at the level that includes those items. Then add VTT access as an add-on.

The add-on price gives you a substantial discount, so the better deal is to get VTT support as an add-on to a different pledge level.

Regardless of how you pledge for it, you can get the VTT package for either Roll20 or Alchemy. You'll tell us which one you want in the pledge manager after the campaign ends. (If you want both, simply purchase the add-on again.)

An illustration showing a group of fantasy characters as they explore a vast, strange dungeon space full of odd structures and weird reliefs set into giant stonework.
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Header: It's Megadungeon Month!
Jewel in the Sky is one of many cool megadungeons being crowdfunded during BackerKit's Mega Dungeon Month event! In celebration, we're making a bonus PDF adventure where you explore old ruins on the surface above the dungeon!

Best of all, you can get a bonus reward for free! Just back two or more projects from Ghostfire Gaming, Goodman Games, Kobold Press, Loke Battle Mats, Monte Cook Games, Rowan Rook & Decard, or Troll Lord Games, you’ll get The Resonating Past in PDF free from us—and a bonus from the other campaigns you've backed as well!

Check out other Mega Dungeon Month campaigns!

An illustration showing a group of fantasy characters exploring a strange dungeon space.
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Header: Never Any AI

You might encounter an AI in dank corridors of Jewel in the Sky, but we'll never use generative AI to make any of MCG’s products.

We make games that inspire us, with people who inspire us, for people who inspire us—so every word and image comes straight from our 100% human imaginations. We won’t insult your creativity, or ours, by delivering purposeless machine-generated drek, especially when we have so many great visions and ideas we’re excited to share with you!

Photo of the MCG team. More about us in the section titled Monte's Return to the Dungeon.


An illustration showing a group of scifi characters investigating a floating mysterious red jewel with a horde of skeletons attack the group.
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Header: Pledge Levels

Standard Edition Book in PDF. $19.

Standard Edition Book in print and PDF. $54.

Deluxe Boxed Set in print and PDF. $149.


Image showing sci-fi characters exploring a huge dark space as they descend an long staircase.


Standard Edition Book in PDF, plus a copy of the Cypher Character Rulebook and Cypher GM's Guide in PDF. $39.

Standard Edition Book in print and PDF, plus the slipcase set of the Cypher Character Rulebook and Cypher GM's Guide in print and PDF. $104.

Deluxe Boxed Set in print and PDF, plus the slipcase set of the Cypher Character Rulebook and Cypher GM's Guide in print and PDF. $209.

Jewel in the Sky for Virtual Tabletop. $49.

Retailers Only. Two copies of the Jewel in the Sky Boxed Set, along with two copies of the Cypher slipcase set (the Cypher Character Rulebook and Cypher GM's Guide). $249.


An illustration showing a group of fantasy characters as they ascend a massive staircase full of rubble, and surrounded by giant statues of strange angelic beings.
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Header: Add-Ons. Jewel in the Sky Exclusive Boxed Set (print and PDF): $149. Jewel in the Sky Standard Edition Book(print and PDF): $54. Jewel in the Sky on VTT: $40. GM's Campaign Journal: $30. Cypher Divination Deck(print and PDF): $25. Cypher XP Deck(print and PDF): $10. NPC Deck(print and PDF): $20. GM Intrusion Deck(print and PDF): $20. The Weird(print and PDF): $55.
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Header: Timeline

Spring 2026 (as soon as we close the pledge manager): existing supplements and add-ons as stock permits (The Weird, NPC Deck, GM Intrusion Deck). Summer 2026: Cypher Slipcase Set. Summer 2027: Jewel in the Sky Exclusive Boxed Set and Standard Edition Book.


An illustration showing large column with spiral stairs set into a round shaft. The stairs descend down into the darkness.
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Header: Shipping

You must receive email from us to claim your rewards! Modern mail clients and AI systems filter your email before you even get a chance to see it. Ensure that our emails are reaching you by marking any email from Monte Cook Games or BackerKit as a safe, trusted, or preferred sender, and adding us to your contacts. Simply replying to an email, or starring it, also helps train your email platform to let you see our emails. These steps help ensure that our emails reach your inbox. (We do send promotional emails, but we promise not to bury you in them. We average fifteen or twenty promo emails per year.)

Subheader: Digital Rewards and Add-Ons
Your digital rewards (PDFs) will be delivered using BackerKit’s Digital Distribution feature. When a digital reward is ready for you, you will receive a message via BackerKit with a link to download your digital reward. We will also deliver digital rewards through our online store and on DriveThruRPG, since many backers prefer to maintain their libraries of PDFs on one of those platforms. (You can use any or all of these platforms to download your PDFs; the files will be identical.)

Subheader: Physical Rewards and Add-Ons
Your physical rewards and add-ons will be delivered through our online store, the MCG Shop. When a physical reward is ready for you, you will receive a message sent through BackerKit with a link that will take you to the MCG Shop to pay for shipping and redeem your reward for free.

We offer a variety of domestic and international shipping methods from which you can choose. As of this writing, basic domestic shipping is $9 per shipment, but we do not control future postal rates, so that cost is subject to change. International shipping is calculated by destination and shipment weight.

Graphic with the following text: This project is customs friendly. Rewards bound for the UK, EU, US, AUS, and NZ will be delivered duty free or duty paid. No extra custom charges!


We operate our own warehouse in the U.S. and work with trusted global fulfillment partners in Europe and Australia. We do everything in our power to get your rewards into your hands as quickly, reliably, and affordably as possible.

United States: Your rewards will be fulfilled by our shipping center in the United States.

Canada: Your rewards will be fulfilled by our shipping center in the United States. You will be responsible for import duties, taxes, and brokerage fees (if applicable). Please note that our books are printed in Canada, and thus they are not subject to import duties; however, they are subject to GST. Items not manufactured in Canada, such as dice and decks of cards, are subject to import duties and GST.

Central America, South America, the South Pacific, and Asia: Your rewards will ship from our shipping center in the United States. You will be responsible for import duties, taxes, and brokerage fees (if applicable).

The EU and UK: Your rewards will be filled by our shipping center in England and will ship DDP (Deliver Duty Paid). UK and EU backers will not pay import duties, but will pay VAT where applicable.

Australia and New Zealand: Your rewards will be filled by our shipping center in Australia. Backers in Australia and New Zealand will not pay import duties and taxes.

For detailed information on shipping and our fulfillment process, visit our Crowdfunding Reward Fulfillment page.


MEGADUNGEON REWARD

Support 2+ or more projects from Goodman Games, Monte Cook Games, Kobold Press, Ghostfire Gaming, Loke Battle Mats, Rowan, Rook and Decard, or Troll Lord Games to unlock the MEGA-Exclusive Reward:
A MEGADUNGEON BONUS PDF.

Each publisher will create 3–4 pages of exclusive content, including monsters, traps, treasures, and twists, all mashed together.

The only way to receive this exclusive incentive is by pledging to 2+ or more of the above anchor projects!
If you believe that this project is not in compliance with BackerKit’s Community Guidelines or Terms of Service, you can file a report by sending a message via this link: Report this project

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