Nearly a quarter of Exploring Eberron is devoted to the planes of Eberron, providing a deeper look into these different layers of reality. While this addresses the supernatural cosmology of Eberron, my Patreon supporters have posed a number of questions tied to the Material Plane. What do the people of Eberron know about the physical universe beyond Eberron? What is the nature of the moons? Could there be a space race in Eberron? Others have raised more practical questions: how do the many moons of Eberron affect its tides? Wouldn’t the destruction of a moon have had even more cataclysmic results than have been suggested?

Ultimately, this begins with a crucial question: what is the Material Plane? In the myth of the Progenitors—a tale told in some form by nearly every culture—the three Progenitors work together to create thirteen planes, each one an idealized exploration of a particular concept: Life, death, war, peace. Following this effort, they rest in the emptiness that lies at the center of the planes. There the Progenitors quarrel. Khyber kills Siberys and tears him apart. Eberron enfolds Khyber and becomes the world itself, forming a living prison she cannot escape.

Whether this is truth or metaphor, it is a basic explanation for natural phenomenon.

• Eberron is the world and source of natural life. It is surrounded by the shattered Ring of Siberys, and it contains Khyber. Whether or not Eberron was once a noble dragon who imprisoned another dragon, it is a natural world that surrounds and imprisons a source of fiends and aberrations.
• Eberron—and its Material Plane—lies between the thirteen planes. It is influenced by all of them but it’s not part of any of them. It’s a world that knows both war and peace, life and death.
• By canon (Rising p. 228), Eberron is the sole planet in its Material Plane. Beyond this, when people dream in Eberron, their spirits go to Dal Quor. When they die, they go to Dolurrh. There are no accounts of people encountering spirits from OTHER material worlds in either plane.

So the first thing to bear in mind: There is nothing natural about the universe of Eberron. The story of the Progenitors might be fact or it could be mere myth. But Eberron does appear to be the center of its Material Plane. It is the fulcrum of the 13 planes, the point where they all intersect — and as shown by Dal Quor and Dolurrh, the creatures of the Material Plane are tied to the other planes. Dig below the surface of Eberron and you won’t simply find a molten core; you’ll find the demiplanes of Khyber. You can go down a tunnel in the Mror Holds, walk five miles, and come out in Xen’drik. Which is to say, this is a supernatural reality. Arcane and divine magic are side effects of this; Eberron is suffused with a fundamental force that doesn’t exist in our world. Now, this may be because Eberron as a setting is a created artifact—that some form of the myth of the Progenitors is true. Or it could be the result of undirected evolution… but that doesn’t change the fact that it is a supernatural reality, fundamentally different from the universe that we know.

This initial section examines the known facts about the celestial objects of Eberron. This is followed by a discussion of the possible space race, which goes into more detail about what might be found on the moons or in the ring. Lest it go without saying, this is my vision of Eberron and may contradict existing sourcebooks.

The Sun and the Stars

In the Progenitor Myth, the three Progenitors rested in the Material Plane after creating the planes. They created the sun, Arrah, much as mortals might kindle a campfire. This fire remained even after their battle, and continues to provide light, heat, and comfort to the world. Arrah is rarely mentioned because it functions much like the sun we’re used to; it’s good that it’s there, but you definitely wouldn’t want to visit it. In the Sovereign Host, Dol Arrah is the Sovereign of Sun and Sacrifice; her name is, essentially, “The Warrior Sun.”

As for the stars, there are stars in the sky of Eberron, but they aren’t the anchors of distant solar systems. There are limits to the Material Plane, and the stars mark those limits; whether or not you embrace the concepts of Spelljammer, you can think of them as glittering points in the shell of a crystal sphere. The common constellations are figures of ancient dragons—Io, Tiamat, Chronepsis—though most people can’t actually say where these names come from. It’s generally assumed that they were handed down by one of the ancient kingdoms of Sarlona, or established by the ancestors of the Aereni; in fact, this is a tradition that was spread by dragons, as they moved secretly among the lesser races.

The Ring of Siberys

The closest celestial object is the Ring of Siberys, a brilliant equatorial band of light that dominates the sky. We know that the Ring is comprised of siberys dragonshards, because it’s where those dragonshards come from. Most fallen shards are quite small, but it’s there are definitely larger shards in the Ring; the civilization of the Qabalrin elves of Xen’drik was destroyed when the Ring of Storms was struck by a massive dragonshard now known as the Heart of Siberys. It’s possible that the entire ring is made up of pure dragonshards, or it could be that there are shards embedded in a more inert material—perhaps the petrified flesh of an ancient cosmic dragon.

One of the more popular schools of arcane thought maintains that all arcane magic (and perhaps divine magic as well) manipulates energy that radiates from the Ring—that magic itself is the “Blood of Siberys.” Whether or not this is true, siberys dragonshards are an extremely valuable resource. Siberys shards are used for dragonmark focus items, but per Rising From The Last War they are also used for “eldritch machines or the creation of legendary items or artifacts.” A nation or house that can secure a reliable source of siberys shards will have a huge advantage in advancing arcane science. It’s also possible that an outpost in the Ring could harness the ambient energy of the Ring itself to perform epic magic. So the Ring of Siberys is close to Eberron and unquestionably valuable; if a space race begins, it’s the logical first step.

The Moons

Twelve orbiting moons are visible from Eberron. Each moon goes through standard lunar phases, and during the month that shares its name, the moon enters an “ascendant phase”; during this time the moon is brighter than usual. Each moon is associated with certain personality traits, and it’s believed that people are influenced by the moon that is ascendant at the time of their birth. Canon descriptions of the moons can be found in this article. Moving beyond canon (something suggested but never defined) there’s a further complication, because the moons are also tied to the planes—and each moon enters its ascendant phase when its associated plane is coterminous, and becomes unusually dim when the plane is remote. So while unusual, it’s possible for there to be two or three ascendant moons at a particular time, if multiple coterminous periods converge.

The connection between the planes and the moons is reinforced by the fact that within a plane, the associated moon is the only one that can be seen in the sky (assuming that any moon can be seen; not all planar layers have a visible sky). However, the phase of the moon doesn’t match its current phase on Eberron. It may be fixed in a single phase—such as in Lamannia, where the moon is always full, or it could change from layer to layer.

By canon lore, no humanoid has ever visited one of the moons. Because of this, their nature remains a mystery. They could be similar to the moon of Earth—harsh and barren. It’s possible that they aren’t planetoids at all, but are in fact planar gateways—that a vessel that tries to land on Dravago will find itself in Risia. This would explain why the moons don’t have the expected impact on tides; it may be that they don’t actually have any mass! A third option lies between these two: that the moons are habitable planetoids that are strongly influenced by the planes they are tied to. The moon Vult isn’t inhabited by the angels and demons of Shavarath, but it could be home to societies of tieflings and aasimar locked in an endless war… though unlike the immortals of Shavarath, the people of Vult might decide to turn their aggressive attention to Eberron!

THE SPACE RACE

By canon, Eberron is the only planet in its material plane. Between the planes and the demiplanes of Khyber, there’s ample opportunity for adventurers to explore strange new worlds, and deep space exploration was never planned as part of the setting; we don’t need to have alien invaders come from a distant planet when we already have alien invaders crawling out of Xoriat. Nothing’s stopping the DM from going full Spelljammer and breaking through the wall of stars. But by default, that’s not the story Eberron was designed to tell.

However, you don’t have to go into deep space to have a space race. The Ring of Siberys is a clear target for any advanced nation. Siberys dragonshards are an immensely valuable resource; now that the Five Nations are using dragonshards in an industrial capacity and can see the potential of siberys shards, it’s only logical that people would be looking to the skies and dreaming of the power waiting to be claimed. Beyond the ring you have the moons. Perhaps they’re barren orbs. But if they’re planar gateways they could be the key to serious planar exploration, and if they’re manifest worlds they could hold unknown wonders. So there’s clearly something to be gained from reaching for the sky. And just as in our world, a space race gives a clear, tight focus for the current cold war. The people of the Five Nations may be afraid to start the Last War anew… but which nation will be the first to plant their flag in the Ring of Siberys?

In dealing with the space race, there’s a few questions to consider. What are the obstacles that have to be overcome? Who’s in the race? Who’s already up there? And what might people find?

Obstacles

If all that it takes to reach the moons is to fly straight up, people would have done it long ago. Even though airships are a relatively recent innovation, surely in three decades SOMEONE has determined just how high they can go… and while airships may be new, brooms of flying and similar devices have been around. If there’s no obstacles, there’s no tension and it’s hard to explain why it hasn’t happened. Yet at the same time, this isn’t our reality and there’s no reason that the obstacles to space travel should be the SAME obstacles that we had to overcome. So as a DM planning a space race, consider the following factors.

• Gravity. If you have to escape the gravity of Eberron to reach the Ring of Siberys, it’s easy to say that no standard methods of flight provide sufficient velocity to accomplish this. This provides room for different nations to be exploring different approaches to attaining that velocity. Elemental binding is an option; how many elementals can you bind to a vessel? Another option is to expand on the arcane principles of levitation, perhaps burning siberys shards to provide a temporary surge of energy. A more exotic option would be to abandon flight in favor of teleportation; imagine flinging a teleport circle anchor at the target.
• Cosmic Rays. The Ring of Siberys is thought by many to be the source of arcane energy. If so, this radiation could be lethal without proper protection. Alternately, the energy might be harmless, but it could overload unprotected enchantments: until people figure out how to protect against this surge, all magical systems could burn out and shut down in the vicinity of the Ring of Siberys. This could form a deadly layer around the entire planet, or this could be a way to explain why people are aiming for the moons instead of the Ring; because they can’t safely get close to the Ring, but they can avoid it.
• Oxygen. At what point does the air become too thin to breathe? Is there a vacuum between Eberron and the moons? Because this isn’t natural space, it could be that there IS breathable air throughout the entire system, or that the Ring or the moons have atmosphere—or it could be that the atmosphere largely behaves the way that we’re used to. If oxygen is an obstacle, it doesn’t affect the design of a vessel, but travelers will need to have a solution. Spells and magic items that allow people to breathe underwater could be adapted for this purpose; it’s possible that the same item could work both underwater or in the Ring of Siberys.
• Hostile Environment. In our world, space travel may require you to deal both with extreme cold or heat. Is the Ring of Siberys shrouded in bitter cold, or is it mysteriously maintained at a comfortable temperature? Chapter 5 of the Dungeon Master’s Guide provides basic guidelines for dealing with extreme cold, extreme heat, or high altitude. These could be intensified to reflect a truly alien environment, either reducing the time between required saving throws or amplifying the effects of failure. This could also be a factor in vessel design. Airships are made of soarwood; will a wooden ship burn up on re-entry?

Who’s In The Race?

The idea of a space race is that there’s a sense of tension and competition. The Ring of Siberys is too vast for any nation to claim dominion over it. But the first nation to establish an outpost in the Ring or on the moons with have the first opportunity to explore the environment, to harness its resources, and to establish contact with whatever creatures could be found there. The idea is that no nation or dragonmarked house has had unlimited access to Siberys shards; no one knows what could be done with that reliable source. So for purposes of the story, people should KNOW who’s in the race; adventurers could involve helping an allied power gain the resources it needs to advance or acting to block a rival power. So who’s in the race?

One option is to focus on the Five Nations: this is about Breland, Aundair, and Karrnath racing to the sky. A second option is to make it a rivalry between house and nation; perhaps it’s about the Twelve competing against the space program of the Arcane Congress.

Personally, my inclination is to focus on the Five Nations—emphasizing that the Last War has been replaced by a cold war. But I’d also throw in additional alliances. House Cannith is involved with everyone; it’s split in three and the house thus wins in any scenario, but part of the question is who wins; it could be generally understood that the Cannith faction that wins the space race will also claim the leadership of the house. So here’s the factions I’d use in MY space race.

• Aundair: The Dragonhawk Initiative. Aundair’s space program is an alliance between the Arcane Congress, Cannith West (under Jorlanna d’Cannith), and House Orien. While they are exploring all possibilities, the Dragonhawk Initiative is focusing on teleportation. There are three current paths under investigation: direct teleportation (which also requires scrying to confirm the target point); physical projection of an object that serves as a teleportation circle; or using a passage through a plane to cross space. Thelanis and Xoriat are the planes most tied to these efforts. There is a branch of the Dragonhawk exploring traditional levitation, but leadership is convinced that teleportation is the cleanest and safest approach.
• Breland: The King’s Observatory. The Observatory is a branch of the King’s Citadel, formed in alliance with Zilargo, Cannith South (under Merrix d’Cannith), and Hosue Lyrandar. While they are exploring traditional levitation techniques, the Observatory is primarily focused on building a better elemental airship, overcoming the obstacles with elemental binding and Cannith ingenuity. Merrix has been experimenting with living ships—a step that could render Lyrandar pilots obsolete. Syrania and Fernia are the planes most associated with their efforts.
• Karrnath: The Blade of Siberys. The Blade is an alliance between the Karrnathi crown, Cannith East (under Zorlan d’Cannith), and a number of wealthy individuals. Antus ir’Soldorak brings tremendous wealth and mineral resources to the table; Alina Lorridan Lyrris is an expert transmuter and owns the richest khyber shard mines in Khorvaire. The fact that they’re both members of the Platinum Concord of the Aurum is a remarkable coincidence. The Blade of Siberys is primarily interested in reaching the Ring rather than the moons. It is focused on traditional magic of flight, but Zorlan is exploring ways necromancy could be used to solve this problem: ghost astronauts? A shadow engine that draws on the power of the Endless Night? These efforts involve the Mabaran manifest zones in Karrnath, but they are considering the potential of other planes. The Blade is also very focused on the military potential of this program, and any Karrnathi space vessel will be heavily armed.

Thrane is currently a minor player in the race, though the Argentum is exploring the possibilities for an engine that harnesses the power of the Silver Flame itself. Likewise, New Cyre lacks the resources to compete with these main players… but Oargev dreams of establishing a true new Cyre on Olarune.

Who’s Already Up There?

The Five Nations may be working to win the space race, but someone else likely won that race long ago. The dragons of Argonessen are an ancient and advanced civilization, and believe themselves to be the children of Eberron and Siberys; if it’s possible to reach the Ring of Siberys, they surely did it long ago. They could use outposts in the Ring to watch for the appearance of Prophecy marks, and the epic magics unleashed in the destruction of Xen’drik may well have been channeled through siberys shards harvested from the Ring. However, the Ring of Siberys is vast and the dragons are secretive; their outposts are surely well hidden, both physically and magically. Having said that, the dragons may not have bothered to explore the moons—so they could be a truly unexplored frontier.

The giants of ancient Xen’drik were also powerful and advanced. Both the Cul’sir Dominion and the Group of Eleven explored the planes; either one could have ventured into space. Any giant outposts in the Ring of Siberys would have been destroyed by the dragons when they laid waste to Xen’drik, but there could be still be ruins in the Ring. And if a DM wants to introduce a powerful force of giants or empyreans, they could have used a powerful sequester effect to conceal a base in the Ring or on one of the moons.

The Undying Court aren’t involved in the space race. The Ascendant Counselors explore the universe in astral form and have no need to do it physically. The Lords of Dust don’t have any outposts of their own, but they are surely watching all the participants in the space race. As the fiends are the children of Khyber, it’s possible that the pure essence of Siberys is especially repellant to them—that any fiend that approaches the Ring will be destroyed.

These are creatures of Eberron who might have settled above it; possible natives are discussed below.

Exploring the Ring of Siberys

The Ring of Siberys is the logical first stop in the space race, being closer than the moons and having a clear strategic value. If the DM would rather focus on the moons, the magical energies of the Ring can be deadly to living creatures. If the Ring is the destination, the first question is whether the Ring has gravity and atmosphere. This is the most magical place in existence, so anything is possible. The next question is whether the Ring is in fact entirely comprised of massive dragonshards, or if the bulk of it is some other material; it could be a soft stone, that some might see as the calcified flesh of an ancient dragon. Even if there is an atmosphere, the Ring is entirely barren. People may be able to dig into it or build structures on the surface, but there’s no natural sources of food or water; travelers will need to either have strong supply lines, or more likely, to come prepared with ways to magically create food and water.

Magic is dramatically enhanced within the Ring. One option is that all spells cast in the Ring benefit from the Distant Spell and Extended Spell Metamagic options presented in the sorcerer class. But it’s difficult to channel this power; if the DM uses this option, all spellcasting carries the risk of a sorcerer’s Wild Magic Surge. With time, it could be that spellcasters could learn unique spells that can only be cast in the magic-rich environment of the Ring.

Even if the energies of the Ring aren’t directly lethal, they can produce many dangerous effects. Just as the energies of the Ring can be used to produce fireballs and lighting bolts, the Ring produces dramatic, unnatural weather effects—bursts of fire, acid rain, illusory manifestations, psychic storms. The Ring also produces living spells, which linger for a time before being absorbed back into the Ring. Other native creatures are rare, given the difficulty of surviving in the RIng. However, just as the rakshasa are said to be the children of Khyber, the native celestials of Eberron—the couatl—are said to have been born of Siberys. While most of the couatl sacrificed their existence to bind the overlords, there could be a few powerful celestials still bound to the Ring. Given that Thrane isn’t a major player in the space race, the first explorers could be surprised to discover embodiments of the Silver Flame itself in the Ring of Siberys.

There’s another exotic possibility. Legends speak of the Irsvern—winged kobolds said to be blessed by Siberys. According to these tales the Irsvern live on the peaks of the tallest mountains; but what if they’re actually natives of the Ring of Siberys? What powers might these children of the Ring possess?

Exploring The Moons

Exploring Eberron provides more details about the planes, and will prove a useful resource whether the moons are planar portals or merely strongly influenced by planes. The main difference between the planar portal and the idea of the manifest world is the degree to which the adventurers can have a lasting impact, and the degree to which the world is an entirely new frontier. The planes are known, even if mortals don’t visit them regularly; and the planes cannot be fundamentally changed. On the other hand, manifest worlds are an opportunity to explore entirely new and alien realms—to have first contact with unknown cultures. This is another a way to introduce exotic races or elements from other settings; perhaps loxodons are from Olarune!

Q&A

Does Arrah orbit Eberron? If so, is it much further away than the moons?

There’s no canon answer to this. What we know is that Eberron has traditional seasons (as defined by the calendar)—that Arrah FUNCTIONS in the way we’re used to a sun working. On the one hand, there’s some logic to Eberron being stuck in the center of its sphere (though it could well be that it rotates in that central point and that Arrah is fixed!).

But let’s consider the Progenitor myth, which again, may or may not be exactly true but is still the closest thing we have to an explanation. In the myth, the Progenitors finish their work and rest in the Material Plane. They kindle Arrah as a campfire. They then fight: Siberys is killed, Eberron and Khyber entwined. Arrah exists BEFORE Eberron becomes a world, and I think it’s perfectly logical to say that ARRAH is at the very center of the plane and that Eberron orbits it. Though another sage could argue that the Progenitors were clearly the focal point of creation and that Arrah would have been pulled into their orbit. So like many things in Eberron, I expect that it’s something sages are actively debating in the world itself.

How do the multiple moons of Eberron affect lycanthropes?

The origin of lycanthropy remains a mystery. All lycanthropes are influenced by the moons, but not all in the same way; this suggests that there may be multiple strains of lycanthropy with different origins. The first strain is only affected by the phases of the moon Olarune; this is typically associated with good-aligned lycanthropes. The second strain of lycanthropy is affected by all of the moons, and multiple full moons can cause extreme behavior; this is the effect reported by the templars during the Lycanthropic Purge, and it encourages aggressive behavior and drives victims to quickly succumb to the curse. The third strain of lycanthrope is affected by the moon(s) that were ascendant at the moment of its birth or at the moment it was afflicted; this is common among natural lycanthropes. When adventurers encounter lycanthropes, the DM will have to decide which strain they’re dealing with.

In the past you’ve said that the Gith come from another world… could this be one of the moons?

It’s a possibility, but not the one I personally use. Exploring Eberron goes into more detail about how I use the Gith in my Eberron.

How do the shifter Moonspeakers see the moons? Are they planar portals or more like spiritual guides?

The Moonspeaker druids view the moons as spiritual guides. This doesn’t invalidate the possibility that they are planetoids or portals; the Moonspeakers invoke the spirits of the moons, just as some other druids invoke the spirit of Eberron. With that said, it’s worth noting that this material contradicts the Moonspeaker’s assignment of the moons; I didn’t design the Moonspeaker and I don’t agree with all of its choices.

While the moons correlate with the planes, is there really a correlation with the Dragonmarks, too? The lost moon is tied to Dal Quor, but the lost mark is the Mark of Death, which would have been tied to the same moon as Dolurrh, I would have thought.

There’s a few basic points here. The moons and the planes are both part of creation; they have both existed since the dawn of time. The Dragonmarks have barely existed for three thousand years, and it’s quite possible they were created by the daelkyr. Consider that Crya was lost tens of thousands of years before the Mark of Death even existed! So the ultimate point is that the association of dragonmarks and moons isn’t a concrete, natural FACT as the association of planes and moons is; it’s a superstition, where people have ASSIGNED marks to moons, because hey, twelve marks, twelve moons. And the people who made those assignments may not even know that there once was a thirteenth moon! So it’s possible that people have stumbled onto a cosmic truth in linking these together‚that even those the marks are recent, they tied into this cosmic code. But it could also be entirely speculative.

Having said that, consider what Dolurrh actually is. It’s NOT the “Plane of Death.” Many believe that it is the plane of transition, where the soul leaves its burdens behind and ascends to a higher realm. Aryth is “The Gateway” — and the dragonmark associated with it is the Mark of Passage. The point of this association is that Dolurrh ISN’T actually the destination; it’s a pathway to the unknown realm that lies beyond.

The moons of Eberron are tied to the planes. What about the sun? What’s it tied to?

There is no canon answer to this question, and I’m sure that sages debate it at Arcanix and Korranberg. I’ll give you three answers that all likely have supporters. One is that it represents nothing. It was created by the Progenitors to serve a utilitarian function; it’s the divine campfire. Another is that just as the moons are tied to the planes, the sun represents the MATERIAL plane. A third is tied to the theory that Dolurrh is a gateway that allows people to transition to the Realm of the Sovereigns, a higher realm no mortal can know; some surely believe that Arrah is tied to THAT plane, which is why it’s so much brighter than the moons; it’s a glimpse of the truly celestial realm.

Thanks to my Patreon supporters, who chose this topic and who keep this blog going! How have you used the moons or the space race in your campaign?