IFAQ: Nonbinary Elves and More About Githberron

I'm getting ready for PAX Unplugged—more information on that tomorrow—but as time permits I like to answer interesting questions from my Patreon supporters. Questions like...
Mordenkainen’s Tome of Foes includes “Blessed of Corellon”—rare elves who can change their sex in a short period of time. How would you incorporate this into Eberron, beyond changing the name to remove the reference to Corellon?
My immediate question is WHY MAKE IT RARE? Why not just make it a standard trait of elves, a reflection of their fey ancestry? Once you do that, I'd just keep in mind that for elves, sex is a form of expression as opposed to an absolute. Some settle on one path that feels natural to them, never using the gift again once they've made that choice... or perhaps shifting every century, taking time to explore different paths. Others might shift casually from day to day, reflecting the mood of the moment. Some elves might use it the same way some changelings use personas, developing a set of unique identities and using the one best suited to a particular scenario. A question a DM should consider if incorporating this into the world is whether an elf can only choose from two options, or if there are other forms they can take with this blessing; this might also lead to the Elvish language having a broad range of pronouns.
Personally, I’d keep the core mechanics intact: invoking the blessing requires completion of a long rest and it doesn’t dramatically change the elf’s appearance. It’s a form of personal expression, not a disguise. But with that in mind, and with the idea that people KNOW this about elves, I don’t see why it can’t just be a common trait to all elves. Given that it requires the completion of a long rest and elves trance during a long rest, I'd personally present it as a sort of meditation in which the elf reflects on their self-image and identity, with their physical form shifting to match their thoughts. If it's something that all elves possess, I'd just call it "The Change" and add it as a trait of the base elf race...
The Change. You may change your sex when you complete a long rest.
In a previous article about obyriths, you said it was possible that "Githberron" had its own overlords and some of them might still exist.
Exploring Eberron presents the idea that the Gith may be the survivors of a previous incarnation of Eberron that was, essentially, wiped and rebooted after being transformed by the daelkyr, which has been refered to in a few places as "Githberron." What I say in the article is that the Obyriths could be fiends from a prior incarnation of Eberron, but that this wouldn't have to be Githberron. Here's the relevant quote from the article:
Exploring suggests that the Gith may be refugees from a previous incarnation of Eberron. An exotic option for the obyriths would be to say that they are fiends from a previous iteration of Khyber... That somehow they escaped into Xoriat and ultimately came to the current incarnation of reality, most likely finding shelter in a shadow demiplane.
This suggests that obyriths may be from "a previous iteration of Khyber"—not necessarily the same one that spawned the Gith. This ties to the idea that the Obyriths are extremely alien—fiends altered by the destruction of their world and by their experiences in Xoriat. The article also calls out that these fiends wouldn't have heart demiplanes in the current reality, and that while they might be physically immortal they wouldn't have the true immortality of a native fiend, and a former overlord wouldn't wield that full power in the current reality.
If Githberron had overlords, did it have its own version of the Silver Flame or some other sealing magic? It's hard to imagine the Gith's ancestors being able to build a civilization with unbound overlords running around.
Who knows? The whole point of Githberron is that it's a previous iteration of reality, one that's different in substantial ways. There could be a union of celestials much like the Silver Flame, sure. But perhaps in Githberron the heart planes of the Overlords were deeply buried and they never emerged to rule an Age of Demons. Perhaps in Githberron the overlords fought one another so fiercely that they crippled one another. Perhaps a few of the overlords overwhelmed the others and dominate the world in a stable, if fiendish fashion. Perhaps there was a proto-Gith Empress who holds the overlords bound with the awesome psionic power of her unmatched mind. Each one of those is possible, and each would have a very different impact on how the world would evolve.
If there was a celestial binding force in another iteration of reality, do you think this power might still be able to be tapped into by a player character?
Anything's possible. Githberron presumably had some form of native celestial. It's possible that some form of native celestial survived that transition. But the point is that it WOULDN'T HAVE THE SAME POWER in this reality that it did in its native reality, because it doesn't belong here. Just as the Obyriths can be permanently destroyed, the same thing would be true of a Githberron celestial. If it draws too much attention to itself and gets targeted by the Lords of Dust, it could simply be destroyed.
So could there be some sort of lingering celestial that could provide power to a player character? Sure, why not? But it wouldn't be remotely on the same level of power as the Silver Flame, and it would carry the risk that it could be destroyed if the actions of the player character draw attention to it. I could imagine, for example, using this as the basis for a Aasimar cleric or paladin, saying that their divine power comes from THEIR PERSONAL CELESTIAL—but that it's a small enough well of power that it couldn't support other clerics or paladins beyond them, and that there's a very real risk that it could be destroyed. Frankly, I think this could be a fun story to explore—what does the paladin do when their divine power source is literally extinguished by the Lords of Dust?—but I'd want to match sure the player was prepared for that to be a possibility.
That's all for now! Thanks again to my Patreon supporters, who are the only thing that makes these articles possible. I hope I'll see some of you at PAX Unplugged!