The Throne of Glass world no longer exists.
It was destroyed by the Asteri to create Midgard.
[Spoilers for Throne of Glass, ACOTAR, and Crescent City]
Many thousands of years ago, and prior to the Asteri's invasion of Midgard, there existed another civilisation. Part of this civilisation lived in a place called Parthos.
More specifically, when asked what the Crescent City world was before the Asteri's reign, Tharion noted that "ancient humans and their gods dwelled here."
An exact description of the Throne of Glass world.
Interestingly, despite the Crescent City books mentioning other continents (such as Pangera), readers are only given a map of Lunathion.
This is particularly strange, as all other SJM books have provided a full world map.
So, why would this be hidden for Crescent City...?
As such, I theorise that Midgard is actually the Throne of Glass world; hence why a full map has not yet been revealed.
Thus, I believe that following the events of Kingdom of Ash, some years later, the Asteri showed up and destroyed their world. The result of this was the creation of Midgard, and subsequently Lunathion - the world Bryce inhabits today.
Evidently, this theory suggests that the timeline between the ACOTAR, CC and TOG worlds are not simultaneous, but rather that Throne of Glass occurred in the past - many thousands of years ago.
When considering this possibility, some rebut that this cannot be possible, as Aelin fell through worlds - right past Velaris and Lunathion. However, there is nothing to suggest that Aelin didn't also fall through time.
In fact, there are a multitude of hints throughout the various SJM books to suggest that time travel, or time manipulation, is indeed possible:
When the Asteri lured people into Midgard, it is said they offered a hand through "space and time."
The Harp, when used, can transport people through "space and eons." In fact, the 26th string is time itself - but what happens when a full melody is played?
Merrill straight up suggests that all of the worlds overlap - sharing the same space, but are separated by time. Almost as if it suggests that ACOTAR, CC and TOG are in the same 'world,' but manifestations of differing time periods; the past (TOG), the present (ACOTAR), and the future (CC).
Most importantly, when Bryce lands in Prythian, she starts to wonder if she had travelled in time; or, if this new world occupies a different time period (the exact concept that Merrill just suggested...)
Further, in her most recent interview, SJM was asked whether time travel would play a part in future books. SJM mysteriously replied, "no spoilers."
Thus, if this theory is correct, and Throne of Glass is indeed set in the past, then it is perhaps no coincidence that "Midgard" is the Norse name for "Earth."
And that "Terrasen" means "Old Earth."
As previously mentioned, a portion of the civilisation that used to inhabit Midgard (and as this theory suggests, the TOG characters) resided in an ancient city called Parthos.
As readers, we are first offered a glimpse of Parthos when Apollion takes Bryce to a "dream world" - a landscape in which the Great Library of Parthos used to be.
When in this dream world, Bryce notes that what remains of Parthos is a "DUSTY plain."
Interestingly, in the ACOTAR world, the Bone Carver mentioned that the world he (and his siblings) came from is now nothing more than "DUST drifting across a plain."
As the Bone Carver mentions this, Feyre notes that he draws three interlocking circles into the ground.
This is the exact symbol of Bryce's Archesian necklace - which is also the symbol of Parthos.
If this theory is correct, then the Bone Carver originated from Parthos - from the Throne of Glass world.
Considering the similarities between the Bone Carver and the Sin Eater (the absent God-like being in the TOG world who quite literally carved bones, and was known as the 'God of Truth')... it makes perfect sense.
However, the most telling clue of all, that connects everything together, is this;
Knowing that Parthos is referred to as a "dusty" plain, consider Rowan's words to Aelin:
"I love you. There is no limit to what I can give to you, no time I need. Even when this world is a FORGOTTEN WHISPER OF DUST between the stars, I will love you."
Why would the world Aelin and Rowan inhabit ever turn into a "forgotten whisper of dust"? Just like Parthos?
It is the world the Asteri destroyed to create Midgard.
As even further proof, recall that when Bryce entered the Asteri's archive rooms at the end of CC2, she found notes on how Midgard came to be.
These notes stated that the "indigenous life was not sustainable" for the Asteri.
If this theory is correct, this suggests that the "indigenous" lives were the Throne of Glass humans, and that they did not possess enough magic (or first-light) to feed the Asteri.
We already know this is true, as it was a similar problem that the Valg previously faced.
Additionally, on the exact same page of the notes that detail the Asteri's invasion of Midgard, there is a sketch of both a wolf shifter, and a mer.
The wolf shifters and the mer are the two species confirmed to be the Throne of Glass fae.
So, it begs the question; why were the Throne of Glass fae explicitly mentioned on the Asteri's Midgard (pre-colonisation) notes...?
If Midgard is built on the ruins of the Throne of Glass world, then I believe that Lunathion is situated on the Southern Continent (the setting of the TOG book, Tower of Dawn).
More specifically, as Lunathion is said to be modelled after an "ancient city," I believe it is modelled after the famed Southern Continent City - Antica.
In Tower of Dawn, Antica is described as a city surrounded by a wall, lined with "olive groves" and "wheat farms" bordering the city.
Lunathion is described in the exact same way:
Further, both Lunathion and Antica have "arid" climates:
And, most notably, both are surrounded by deserts; a unique geographical feature that is not prominently featured in other SJM settings.
As such, this suggests that the lost library of Parthos, is the Torre Cesme.
Perhaps the most sacred building in the entirety of the Throne of Glass world, the Torre Cesme is home to a huge library - one that is said to be the oldest.
In the present day, Jesiba Roga guards the remaining books that were once held in the library of Parthos (or, in the Torre Cesme library).
Prior to the end of CC1, Jesiba kept these books locked away in her store, Griffin Antiquities. Interestingly, a set of "glaring owl eyes" had been placed on the store to Jesiba's shop.
Owl's are the symbol of Silba, and the healers of the Torre Cesme.
Further, considering that Yrene's healing abilities are the exact same as Bryce's Starborn powers - could this explain why Jesiba looked like she had "seen a ghost" when she first beheld Bryce's Starborn light?
Such a notion makes even more sense when you consider that Hypaxia's tutor was brought back to life using necromancy, and was originally an inhabitant of Parthos.
Hypaxia states that this tutor specifically trained her in healing magic; just like the healers of the Torre Cesme.
In fact, the scene of Hypaxia removing the Kristallos venom is near identical to Yrene removing the Valg parasite from Chaol:
Speaking of necromancy, knowing that Hypaxia's family dabbles in such magic calls into question the identify of Lidia, Hypaxia's half-sister.
Is she Aelin Galathynius, brought back to life?
Or, perhaps she is a child of Aelin and Rowan, brought back to life?
Not only do Lidia and Aelin look near identical,
Not only is Lidia represented by flame (Aelin's power),
But her shifted form is that of a deer; that sacred animal of Terrasen. Even her last name "Cervos" is a type of female deer.
Lidia is also seen wearing a "gold ring, crowned with a square, clean-cut ruby." This is the exact description of the ring Aelin have to Rowan when they married.
Further, Ruhn also suggests that Lidia must be an Asteri, or as old as one, given the way she uses language. However, as Lidia is only 47, this makes no sense.
However, it makes perfect sense if Ruhn is actually talking to Aelin, or Aelin's child; someone who, according to this theory, existed many thousands of years ago.
(And, as a side note - given that Lidia looks like the "spitting image" of Luna, and that Luna's sacred animal is the Stag... could it be that Luna is Aelin? And that Lunathion was named after her?)
Is it then perhaps no coincidence that one of the houses of Lunathion is the "House of Flame and Shadow." Aelin was known as the "Queen of Flame and Shadow."
In fact, Throne of Glass being the past world of Crescent City explains a plethora of connections:
The "Stag King" of Avallen.
Ruhn being named after the Ruhnn mountains.
Why so many CC places sound like TOG places (Morrah = Morath, Korinth = Orynth).
The witches worshipping the same "three-faced goddess."
Why wyrdmarks can be found everywhere (especially underwater, where some of the ruins of the "ancient civilisation" are said to lie).
It also explains the "World of Throne of Glass" book, which to this day, mysteriously remains unpublished.
According to SJM, the World of Throne of Glass is an "encyclopedia" that documents the full history of the Throne of Glass world. Written by a "grumpy librarian," SJM stated that it will "feel like a book you can pull off the shelves of an ancient library."
It's almost as if the World of Throne of Glass is a Parthos book in itself...
Is that why it remains unreleased?
If this theory is correct, some may wonder how SJM could possibly include TOG characters if they are indeed dead.
I believe there are two viable options:
The "rewrite history" route:
In a future multiverse book series, the main characters of CC and ACOTAR would team up, and using the Harp/Horn (or perhaps the full power of the Dread Trove), they would go back in time. In doing so, they would join forces with the TOG characters, and stop the Asteri from ever overthrowing their world.
If successful, it would mean that the Dusk Court was never destroyed. At present, Bryce is hinted to be the ruler of this court... but it doesn't exist (and there isn't a lot of time to rebuild an entire city). However, if time manipulation was used... no rebuilding would be necessary.
It would also explain why the Oracle told Ruhn that the "royal bloodline will end" with him - as Midgard would never be created, the same applies for the Autumn King's reign.
Alternatively, perhaps when the Asteri arrived in the TOG world, some of the main characters were able to escape into other worlds - such as Prythian.
This would explain why so many of the characters in the ACOTAR and TOG worlds share many similarities (for example, Tamlin as the ancestor of Aedion and Lysandra...)
This would also explain why so many of the ACOTAR character's last names have been hidden from the reader.
Some characters may have escaped elsewhere too, such as Hel...
(^ This is more of a crack theory, but there's only two characters in the SJM universe who have "freakishly" blue eyes, can shape shift into any form they choose, and have powers that manifest as cold...)
However, no matter the method of saving the world, or storyline adopted, Aelin said it best herself:
"This world will be saved and remade by the dreamers."
