An illustration from the Astral Adventurer's Guide of a dark skinned adventurer in blue tunic flying through outer space on a magic carpet, with fish swimming by their head

It hasn’t been long since 5e’s newest collection, Spelljammer: Adventures in Space, was released out to retailers, and subsequently to Dungeons and Dragons players. It’s a collection of 3 books: The Astral Adventurer’s Guide (a typical sourcebook, with an overview of the setting and new rules for Spelljammer), Boo’s Astral Menagerie (a monster manual with spacefaring monsters and enemies), and Light of Xaryxis (a short new adventure module to get you and your players started in the setting). Almost everyone that I know has been excited since it was first announced, and subsequently have been poring over their new copies, plotting new sci-fi-inspired adventures, and generally marinating themselves in the content.

I was especially excited, having read and loved a number of the original sourcebooks, to see what aspects of the game they kept, and which they changed. And for the most part, I’m pretty happy with the content that WotC released. But I have a major problem with perhaps the most important part of the Spelljammer setting – how it’s meant to work at all.


The Hadozee’s New History

The largest problem with the Astral Adventurer’s Guide was, of course, the racist undertones applied to a new species history for the Hadozee. This isn’t just a problem to be debated, and the issues with it have been fully explained by a number of concerned individuals and open letters to Wizards of the Coast. This Divination is not about that, and information about it should be learned from well-informed individuals.


Wildspace in the Astral Sea

I was pretty surprised to find that the name of the new Spelljammer sourcebook was the Astral Adventurer’s Guide. It makes sense upon reading it, since you find that Wildspace (what we would consider to be outer space) is in fact where the Astral and Material Planes overlap, and to get between different Wildspace Systems (aka the solar system of each DnD setting) you travel through the Astral Sea. Travel to another system is done by thought, doesn’t technically require a ship at all, and travelers just know the fastest route to where they want to go.

A map of the Astral Sea from the Astral Adventurer's Guide. It shows various dark purple circles along what appear to be orbit lines in a light purple sea, interspersed with various buildings and places marked as 'dead god's

This is kind of terrible, world-building wise.

Originally, each setting was contained in a Crystal Sphere, crafted by one or more creator-gods for that world. Within these spheres, various solar systems and planets floated in Wildspace (also outer space to us). Those spheres then ‘floated,’ or existed, surrounded by phlogiston, a void-like space between them, except for a colorful flow of liquid-like matter known by the same name (or, colloquially, the Rainbow Ocean). This Ocean had currently which could reliably take travelers between different Spheres (if they knew how to navigate them), or could be explored to discover new and exciting worlds. The Astral Plane was another plane entirely, overlaying all Spheres. You could travel to another world through the Astral Plane (as it doesn’t have Spheres, planets, or systems in the way that the Material Plane does), but it does also require navigation, and contending with its own inhabitants.


An image of a map of the phlogiston. It shows dozens of routes in different colors, leading to various circles and locations. It looks like the map of a city


Why The Astral Sea Doesn’t Work

While the idea of the Astral Sea is certainly simpler than phlogiston, it complicates more than a few aspects of gameplay.

A planar map from 2e DnD. It shows the material plane existing separately from the elemental, astral, and outer planes, with the phlogiston as a part of the material plane

For one, it eliminates a great deal of the potential for worldbuilding.

In many Spelljammer settings, the difference between Astral and Material travel between worlds is especially important. Mind Flayers are common in Wildspace and the phlogiston, for example, because the Githyanki like in the Astral Plane, and they have to contend with them when they travel through it. The Astromundi Cluster setting, for another example, has a unique trait that allows travelers to enter but not exit, which has trapped a number of peoples, creating it’s unique social and political worldbuilding. That entire setting won’t work in 5e now because a block on the Astral Plane would have wildly different implications for the worldbuilding.

For another thing, this new addition to travel in the Astral Sea confuses things about the Astral Plane, which is a location that already has important aspects of worldbuilding tied to it. The Outer Planes, for instance, where the strangest and most disturbing entities lurk, so horrific that they corrupt upon first sight, are located at the edges of the Astral Plane. Does Spelljamming travel put you in danger of these things? Living, intelligent creatures also sometimes travel to the Astral Plane in their sleep (or at least their minds do). If you sleep in the Astral Sea, do you risk veering off of your course? Can a being from the Material Plane sleep in the Astral Plane at all? And what is now implied about those races which were once phlogiston-travelers, like Giff and Neogi? The Astral Plane is a vastly different place to the phlogiston, but are we supposed to assume that doesn’t change anything about them?

An illustration from the Astromundi Cluster sourcebooks. It shows a man in a cloak hiding his face, holding a saber against his shoulder. Behind him, a small ship is sailing toward what appears to be a space station of some kind

And perhaps most importantly, it severely limits the type of adventure that you can even have in Spelljammer. Nothing can ever be lost in 5e’s universe. Nothing can ever be hidden. There can be no mysteries to solve. Quite frankly, it’s boring. The idea of being able to intuitively know how to get somewhere (even if you might encounter things along the way and get sidetracked) limits the feeling of space exploration, or travel into the unknown.


No, while I don’t mind using the new rules for Wildspace travel, I’m definitely sticking to the old rules for travel between settings.





What do you think about the new worldbuilding for Spelljammer? Do you like it, or are you sticking with previous editions’ use of Phlogiston and Astral travel as different methods of getting between worlds? Let us know in the comments below!



Blog postD&dDnd historyDnd opinionsTtrpg




It’s a bit perplexing that they didn’t make 5e Spelljammer completely consistent with the 5e Planescape that came a short while afterwards.

It’s also a bit strange that since they were simplifying the cosmology they didn’t take the opportunity to include the Blind Eternities and the various MtG worlds.



I’m gonna try to introduce the concept of astral flow, and mesh the two settings, with colorpools and such, and each sphere and each air bubble will have it’s own ethereal plane, where you go when you sleep.

If you astral project, it takes you to a random place in the astral.



I agree with everything you said. The idea that you don’t even need a spelljammer to travel the astral sea is lame, and totally negates that whole aspect of the game. on top of that the spelljammers were so lack luster. The rules being nearly missing from ship to ship combat really annoyed me, cause that was a huge part of Spelljammer, it’s what made it different from a standard D&D game. I too will be using the old method of travel between worlds.



I loved Spelljammer for 2nd Edition, it was my first introduction to play, and when I heard about the 5e version I got it as my first intro into 5e. I really don’t like the Astral plane replacing the spheres and the Phlogiston, it seems just lazy and out of place. I think they thought that since the Githyanki had astral ships, it would tie in, but it doesn’t really.

Leave a comment

All comments are moderated before being published

Featured products

Dice Giveth and Taketh Deluxe Dice BagDice Giveth and Taketh Deluxe Dice Bag
Sale price$9.98 Regular price$19.95
Dice Giveth and Taketh Deluxe Dice Bag