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Codex of the Infinite Planes
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Codex of the Infinite Planes


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Codex of the Infinite Planes

Multiverse of Wonder and Adventure!

Fully bookmarked 369 page PDF! Color interior art! Crack open the Codex of the Infinite Planes and unlock a multiverse of wonder and adventure!


Your world is about to get much bigger. Infinitely bigger, specifically!

Codex of the Infinite Planes is a Dungeons & Dragons supplement expanding upon the planes of existence. The planes have been a presence in Dungeons & Dragons since the earliest days of the game, with multiple sourcebooks (and even an entire setting) dedicated to describing the fantastic worlds existing beyond the Material Plane.

Most of these previously released sourcebooks are constrained in scope and content by serving multiple purposes. Codex of the Infinite Planes is dedicated to detailing exciting and usable content centered around the known planes of existence for the purpose of using in memorable adventures. The known planes of existence, in this case, includes the four elemental Inner Planes and their intersections, the two transitive planes, three echo planes, and sixteen Outer Planes.

Each plane receives a detailed description, including game mechanics handling hazards and phenomena, notes on traveling to and within the plane, a look at the powerful people and organizations operating on the plane, a review of the monstrous inhabitants, a host of interesting sites and treasures, random encounter tables for each plane, and adventure hooks providing examples of using the plane in a scenario. The information is largely aimed at Dungeon Masters looking to craft exciting adventures utilizing the planes, but the information is valuable to players looking to create characters tied to the greater multiverse of the campaign setting.

Other releases in the Infinite Planes series provide content useful in different ways. Monsters of the Infinite Planes provides creature statistics for over 200 monsters inhabiting the planes along with helpful generic statistics for planar NPCs. Heroes of the Infinite Planes includes new subclass options for each class along with new feats, spells, and magical items. Look for these releases on the DMs Guild!

Contents of the Codex

This book provides information for the Dungeon Master helpful to utilizing the known planes of existence in their campaign settings. Alternately, it can be used as a complete campaign setting in itself! The contents of the book are roughly defined as follows. Much of the information is meant to supplement the content in the Dungeon Master’s Guide, specifically Chapter 2: Creating a Multiverse.

Chapter 1 Essence of the Infinite Planes outlines the general principals of the planes of existence as they exist within Dungeons & Dragons, along with definitions for common terms used throughout the book.

Chapter 2 Using the Infinite Planes provides tips and suggestions on how to use the planes of existence in your campaign, along with details on traveling through them and a glossary of keywords that can be helpful to find useful information in the book.

Chapter 3 Gazetteer of the Infinite Planes forms the bulk of the book and includes detailed descriptions of 26 planes of existence. Planes detailed include: Plane of Air, Plane of Earth, Plane of Fire, Plane of Water, Border Elemental Planes, Astral Plane, Ethereal Plane, Plane of Shadows, Plane of Faerie, Plane of Dreams, Infinite Layers of the Abyss, Infernal Battlefield of Acheron, Olympian Glades of Arborea, Peaceable Kingdoms of Arcadia, Wilderness of the Beastlands, Twin Paradises of Bytopia, Tarterian Depths of Carceri, Blessed Fields of Elysium, Bleak Eternity of Gehenna, Gray Waste of Hades, Ever-Changing Chaos of Limbo, Clockwork Nirvana of Mechanus, Seven Heavens of Mount Celestia, Nine Hells of Baator, Windswept Depths of Pandemonium, and Heroic Domains of Ysgard!

Chapter 4 The Codex and Its Keepers describes the Codex of the Infinite Planes itself, along with the planar sages dedicated to studying its mysteries.

Chapter 5 Toolbox provides information for crafting new planes of existence. It includes a master list of all hazards and phenomena from Chapter 3 along with suggestions on how to build new planes of existence. They’re not known as the Infinite Planes for nothing!

Want to populate the multiverse with new monsters? Check out Monsters of the Infinite Planes!


Visit the Infinite Doors of the World Serpent, the largest tavern in the multiverse, to expand your Infinite Planes adventures!


Encounters in the Infinite Planes gives you short adventures you can use to spice up the multiverse!

Encounters 01 Plane of Fire  Encounters 02 Plane of Water  ENCP03_Cover_Thumbnail.jpg

Tales of the Infinite Planes to take your adventures across the multiverse!


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Discussions (9)
Customer avatar
Michael V November 11, 2020 4:03 pm UTC
So I bought about half of the individual codices over the last year or so. I don't suppose you'd offer some sort of discount code to returning customers who want to finish their collection with the one-volume set?
Customer avatar
Dave C November 11, 2020 5:10 pm UTC
Thank you for your interest! Because it's a separate product there isn't anything automatic I can setup, but I definitely don't want to leave you out in the cold! Email me directly at and I'll see what I can do at least. Thank you!
Customer avatar
Daniel F October 28, 2020 11:43 pm UTC
Any plans to get a print version of this released as well as the monster codex?
Customer avatar
Dave C October 28, 2020 11:59 pm UTC
I wish! Those decisions are outside of my control unfortunately. I was really hoping for a POD option, and here's to hoping for something in the future. If and when that happens, I'll do my best to make sure prior PDF purchases go towards the cost of the print book. Thank you for your interest!
Customer avatar
Nikolaos V October 27, 2020 10:25 pm UTC
Not sure if you care about this stuff but on page 16 you have a typo. It reads "completed separated" and it should say "completely separated".
Customer avatar
Nikolaos V October 27, 2020 7:55 pm UTC
I'm looking to purchase one or more of these guides to the planes. My question is what is the difference between the Codex of the Infinite Planes product versus the Codex of the Infinite Planes Bundles? Which one should I get?
Customer avatar
Dave C October 27, 2020 8:00 pm UTC
Good question! I've been working on this project for almost 3 years, and during that time I would release the individual plane with monsters and gazetteer information as I completed them. Those products are still up, but the best value I think is in the Codex of the Infinite Planes full PDF (this product on this page) along with the Monsters of the Infinite Planes (linked to in the description above). There's more content in those two products than the whole of the individual Codex entries. I'm leaving the old ones up mainly to keep options for those that only need info on one of the planes, but the best value is in the complete PDF versions. Eventually I'll get Heroes of the Infinite Planes released as well that contains PC options! I hope this helps, thank you for your interest!
Customer avatar
Nikolaos V October 27, 2020 8:02 pm UTC
Thank you for the quick response! Purchasing this product now.
Customer avatar
Nicholas Z October 26, 2020 1:39 am UTC
I love Planescape and this was a great way to help bring elements of it into my 5e campaign. My only question was the book refers to the Positive and Negative Energy Planes in several places but they don't have sections of their own. Did you have any plans to write anything expanding on them at any point in the future?
Customer avatar
Dave C October 26, 2020 2:56 am UTC
Absolutely! I meant to add them in as an appendix to the full volume but wanted to get it up and out. Now that it is, I'm working on fleshing out those two planes - they're each uninhabitable at their core, but I'm incorporating the ideas of the "quasi-elemental" planes into them to create usable spaces (Lightning, Mineral, Steam, and Radiance for Positive Energy Plane, and Salt, Dust, Vacuum, and Ash for Negative Energy). I hope to have it added to the PDF in a few weeks!
Customer avatar
jonathon R October 23, 2020 8:32 pm UTC
Would have thought that the city of sigil would have been included is there plans to add this?
Customer avatar
Dave C October 23, 2020 8:45 pm UTC
You would normally be right to think so! However, under current DMsGuild guidelines, Planescape is not an allowable setting to use in DMsGuild products. Sigil is what I consider one of the three core components of the Planescape campaign (the other two being the factions and the idea that belief shapes the planes), so I could not use the City of Doors for the Codex. If that ever changes, I'll definitely loop back and add in details about the city, though there is a wealth of existing content covering the city already.
Customer avatar
Benedict H November 05, 2020 6:05 pm UTC
Hi Dave, love your work.

Is the Planescape IP the reason you didn't include the Outlands? I'd love to see your take on some true neutral locations.
Customer avatar
Dave C November 05, 2020 6:32 pm UTC
Thank you! It's been a blast working on this project over the past 2 1/2 years, and I've got some more stuff coming (Far Realm, Energy Planes, World Serpent Inn!)

As far as the Outlands go, largely yes, because so much of the Outlands is tied to Sigil and the gate-towns, all part of the Planescape setting. There's room to explore more, and I've got it earmarked for an appendix article, but it might be a bit before it comes up in the queue to work on. If Planescape ever does get released I'll probably bump it up though! Thanks again!
Customer avatar
Christopher B October 16, 2020 11:56 am UTC
The product description mentions 16 Outer Planes, but the supplement seems to have only 14. I guess Elysium and Carceri were cut out in the editing process? Will they be added back later?
Customer avatar
Dave C October 16, 2020 12:37 pm UTC
That's strange! I just downloaded the file and Tarterian Depths of Carceri goes from page 214 to 226 and Blessed Fields of Elysium runs from page 227 to 239. I'm not sure what could have happened if your copy is missing those, but it may be worth downloading the PDF again to see if it works now. Let me know the result!
Customer avatar
Dave C October 16, 2020 1:19 pm UTC
Ahh I think I found the issue! Elysium and Carceri are missing from the Contents page! D'oh! I'll get the file updated and a new version uploaded today. Sorry about that! They are definitely in the Codex, just missing from the Contents.
Customer avatar
Christopher B October 16, 2020 11:18 pm UTC
Hi Dave, thank you. I saw you posted an updated version of the file.
Customer avatar
Chadil W October 16, 2020 12:55 am UTC
What's the difference between this book and the bundles? I.e. if I already bought the bundles then will there be anything new in here?
Customer avatar
Dave C October 16, 2020 2:35 am UTC
Excellent question! I added new content to each of the individual Codex for the compilation, specifically two new sections for each plane: Highlights & Impressions, providing helpful ways to make the plane distinct during play, and Creatures & Denizens, highlighting common creatures by type (each plane features three or four monster types and examples of inhabitants). The total content added for this was about 30K words! And then there's the info on using the planes in Chapter 2, along with the description of the Codex itself as an artifact, a review of the its keepers, and the toolbox containing random tables and a master list of all Hazards & Phenomena for reference (and rolling randomly if you wanted!). My goal will be to update the individual Codex entries with the Highlights & Impressions and Creatures & Denizens information but it's going to take some time to go through all of them and update the PDFs. I also added more art throughout the PDF itself, mostly stock art from the DMsGuild...See more
Customer avatar
Kian B October 15, 2020 7:59 pm UTC
Anything about the Far Realm?
Customer avatar
Dave C October 15, 2020 8:01 pm UTC
Sadly, I had to cut that content from the final release, but I'm still working on it. It will likely get an appendix release (or if I can't get POD I'll just add it into this PDF where it was originally going to be!). The Far Realm is ... hard though, because its alien nature bends and breaks every natural rule. To capture that in a game is difficult but I've got some ideas :) Thanks!
Customer avatar
Dave C October 15, 2020 8:04 pm UTC
That being said, there's plenty of Far Realm influence all over the planes. The key places are the Plane of Dreams and the Windswept Depths of Pandemonium, and the Monsters of the Infinite Planes include D&D stats for gugs, zoogs, shoggoths, dream cats, nightgaunts, and other Lovecraftian beasties that originate from the Far Realm!
Customer avatar
Kian B October 15, 2020 8:29 pm UTC
Cool. I'm definitely interested in that appendix when it comes out! My players are investigating a Far Realm incursion into the Prime Material Plane right now and I'm having a blast making everything uncanny and weird.
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This title was added to our catalog on October 15, 2020.