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What do we know about Enalius? From ACOSF, Emerie provides us with a little exposition when they are in the Rite, when the Pass of Enalius is brought up:

Long ago—so long ago they don’t even have a precise date for it—a great war was fought between the Fae and the ancient beings who oppressed them. One of its key battles was here, in these mountains. Our forces were battered and outnumbered, and for some reason, the enemy was desperate to reach the stone at the top of Ramiel. We were never taught the reason why; I think it’s been forgotten. But a young Illyrian warrior named Enalius held the line against the enemy soldiers for days.

Now, from the Crescent City crossover, we learned that Truth-teller and Gwydion are twin blades. They are a pair. According to the Silene History Lesson, the dagger used to belong to her father's (Fionn's) dear friend, slain during the war. A bit later, when they find Vesperus, she confirms that this friend was Enalius:

The Asteri’s eyes flared with recognition at the long blade. “Did Fionn send you, then? To slay me in my sleep? Or was it that traitor Enalius? I see that you bear his dagger—as his emissary? Or his assassin?”

Immediately before that, she also confirms that the Asteri crafted (which can either mean created, shaped forged, but we are going with created) the Illyrians:

The Asteri’s blue eyes lowered to the dagger. “You dare draw a weapon before me? Against those who crafted you, soldier, from night and pain?”

From everything, we can conclude this: Enalius was the original wielder of Truth-teller before Fionn and Theia, a dear friend to Fionn, and someone who pulled the ultimate sacrifice to keep the Asteri/Daglan from reaching the top of Ramiel. He was a traitor to the Asteri, a rebel against his masters and everything they stood for.

Enalius is the hero most Illyrians strive to mimic, the legendary figure who they all hope to one day surpass. He's a symbol of their people, even if so much about him has been forgotten — the fact that he had a dagger, Fionn's friendship, what the battle was for, maybe even how he was as a person. Brave, for sure. Willing to die for the cause.

And it's Azriel who bears his dagger. Azriel, who has such a complicated relationship with his Illyrian heritage and loaths it - and by extension, himself - is the one with this enormous legacy right at this hand. And this matters.

Still in ACOSF, we have Rhys talking with Cassian and wanting him to play Courtier, the following exchange then follows:

“What, we’re doing some role reversal? Az gets to lead the Illyrians now?” “Don’t play stupid,” Rhys said coolly. Cassian rolled his eyes. But they both knew Azriel would sooner disband and destroy Illyria than help it. Convincing their brother that the Illyrians were a people worth saving was still a battle amongst the three of them.

Azriel hates the Illyrians for what happened to him and his mother and his dislike for them is, to a degree, understandable. The thing is that Azriel, no matter how much he loaths it, is Illyrian. Maybe he's more than that (as it's pointed that Az is different in a lot of ways and Bryce wonders if he is Starborn), but at heart, he's Illyrian. Siphons, leathers, fighting, being Carynthian, his wings, his scabbard and the dagger it holds.

It was healthy, perhaps, for Az to sometimes remember where he'd come from. He still wore the Illyrian leathers. Had not tried to get the tattoos removed. Some part of him was Illyrian still. Always would be. Even if he wished to forget it.

Being Illyrian is part of who he is and his deep hatred for them only fuel his self-loathing. He would like to set himself apart, but he is not.

We can actually draw a direct parallel between Azriel and Bryce with how they regard the Fae vs the Illyrians. Bryce loathes the Fae and for most of HoFaS, she believes they are evil, corrupt, power-hungry and quite generally, not worth saving. She would leave them all to burn. Sound familiar?

And Bryce is wrong. Sathia challenges her notion, pointing out that she's laying judgement to all fae and that is hardly fair. What the one who don't deserve it? Herself, yes, but Flynn, Declan, and Ruhn himself? Do they deserve to burn too? Bryce herself acknowledges this:

Urd had sent her there to see, even in the small fraction of their world that she’d witnessed, that Fae existed who were kind and brave. She might have had to betray Nesta and Azriel, trick them … but she knew that at their cores, they were good people. The Fae of Midgard were capable of more. Ruhn proved it. Flynn and Dec proved it. Even Sathia proved it, in the short time Bryce had known her.

And this part here sums up quite neatly:

Fire met starlight met shadows, and Bryce loosed herself on the world. It ended today. Here. Now. This had nothing to do with the Asteri, or Midgard. The Fae had festered under leaders like these males, but her people could be so much more.

There are Illyrians who are kind and brave and break the mold. We see this with Emerie, who is also a woman. We see that with Balthazar, Cassian. The main point stands, though, that you cannot judge or condemn an entire race for the bad apples.

Azriel is wrong, just as Bryce was wrong, and his journey will be also to realise that his people are worth saving. They were created of night and pain (words that Azriel embodies, being a master of shadows and a torturer), but that is not everything they need to be. They can be more than soldiers. They can thrive.

And I believe this was something Enalius himself came to the believe, long ago. His people deserved more than to be slaves to the Asteri, forced to give them their power when need be, bred to live and die for them. They could be more. And Enalius died to free his people from their chains.

Is Azriel Enalius's blooded descendant? I'm not sure, but he doesn't need to be. Azriel is Enalius successor because he will finish what was started. He'll uncover the secrets of the past, what his people were in truth, what Enalius rebelled for, what he stood for, what the Blood Rite truly means - which he only got a glimpse of.

And this is where I think Emerie will also come in. She's s one of ACOSF most relevant characters and the first female Illyrian to be Carynthian. I think Emerie will also become an inspirational figure to the Illyrian women, another of these what they coud be. What they can be. And more importantly and that is just a theory, what they were.

Orestes was a warrior. What if so was Carynth and she was woman? The name always struck me as similar to Carina, which is the name of a constellation and commonly used by women. It would be ironic and another shaking revelation to the Illyrians that Carynth, for whom their greatest warriors are named after, was a woman.

Does that mean all Illyrian women must become Valkyries? No, but some might wish to follow this path whilst their society takes its time to catch up. They already shook the status quo and with Nesta poised to have a big role (andthe Valkyries along her), they will continue to do so.

In ACOSF, Amren tells us about the Bog of Oorid and how it wasn’t always this evil, accursed place. It used to be a sacred ground, where warriors of the Fae were laid to rest, long ago:

The Bog is a part of the Middle, which is mostly uncharted territory full of dangerous creatures, where Wild Magic runs unbound. A council of Ancient High Lords prohibited any mappings of it. We also learn from House of Flame and Shadow that the Middle was the Daglan's personal hunting grounds, where they unleashed beasts they bred to serve as worthy prey:

We know for a fact that Fionn was in a Marsh - a bog - when he died, with islands and grass and black waters, and we also know that the place was blooming when he was there. Even with the amount of evil and beasts kept in the Middle, the land was still thriving:

This is a sharp contrast to present day ACOTAR. In Silver Flames, the Bog is described as oppressively still and dead, all gnarly, leaflesss branches branches, crumbling trees, thorns. There are no birds, no insects. It's a place of death, of Evil, and it's remarked how it's as if not anything bloomed:

House of Flame and Shadow provides this passage just after Fionn dies:

Also from Flame and Shadow, we knows that the worlds have souls and degrees of sentience, as far as worlds go. Fionn is murdered in a foul act of violence, fueled by nothing but hunger for power by the very people who were supposed to aid him. Fionn, who worked to free the world from the Daglan feeding on its magic. It seems to me that the world was thankful to him for what he did, as it might have also been thankful to Theia.

And you know what's more interesting? That this is where the Mask ends up. We don't know what in the world happened to the Mask after Theia left Prythian; it's not said what she did with neither it nor the crown. Presumably other people got ahold of them (Helion's ancestor?). We don't know where the Crown was, but it's ironic that it ends up where Fionn died.

When approaching the water, Nesta remembers a story her mother told of how a cosuin was killed by Faeries, dragged to the depths and drowned:

Which is actually very similar with how Fionn himself comes to meet his end: bound and gagged and thrown into the water by his wife and general. Shortly after, she meets the Kelpie, who is described as such:

This is also remarkably similar to the creature that ultimately kills Fionn:

This Kelpie speaks to Nesta in the Old Tongue, which hasn't been spoken in fifteen thousand years. It retreated to the Bog thousands of years ago and it was probably the last o his kind. It could very well be the creature that killed Fionn, slain by Nesta, who goes to claim the Mask as he himself did.

Which brings up some questions: how did the Mask end up in the Bog of Oorid? It doesn't seem happenstance that it found its way to a place where death has in its grip and the open grave of the High King. Could it have been Helion's ancestor? His reaction to the mask is strange, visceral in a way the other's aren't. I'm betting that it was Helion's ancestors who took the Mask from Theia and once the power proved too much, discarded it to rest in Oorid.

But the point is that Fionn dies and it's the nail in the coffin for Oorid. The Bog withers to a giant, accursed grave, trapped in a state of perpetual death where nothing blooms.

First, it's helpful to get some context for what we know (for sure) about the Prison:

It was the land of dusk (not a Court in the way Prythian currently has courts).

After the events with Fionn, Theia, Helena, Silene, and Pelias, the land was mostly abandoned.

When Silene returned from Midgard, she created the Prison in order to hide the Harp, using the monsters she put there to deter anyone from looking for it. Silene decided if this place was seen as cursed, then let it be cursed.

We also find out that Silene left her portion of Theia's light under the Prison, which Bryce then took.

There is also a large cache of firstlight remaining under the Prison.

When Bryce used Truthteller and Gwydion/the Starsword to heal Avallen, Pegasuses appeared again.

Avallen and the Prison are in "thin" spots in the universe that make it easy to travel from one planet to the other (fwiw, this idea is not unique to sjm. See: Stephen King.) These spots are identifiable by the mists that surround them.

These thin spots are also on the nexus of ley lines, where energy flows.

It stands to reason that when Bryce "unlocked" Avallen, the energy and magic that it now experiences will flow to other places along the ley lines, IE the Prison. It's also implied that the land keeping the power imprisoned is one of the reasons it grew sick.

Bryce's actions in hofas have implications for Prythian. While the above is related to the Prison, we also have:

Nesta now has possession of the Starsword/Gwydion

Azriel's reaction to Truthteller and the Starsword being together

The 8-pointed star (more on that later)

Part two: what we know based on ACOSF

So based on this information, we need to go back to acosf and look at what sjm left for us. 

The main thing to keep in mind is that Nesta found the Harp in the Prison, and that it was laying on an 8-pointed star. 

One of the main dangling threads from acosf - that we know to be canon, that is not a theory or supposition - is that the Illyrians and the Valkyries are going to continue training together. We know that Mor is interested in training with the Valkyries. From hofas, we know that Nesta is every bit as well trained now as she was in the months since acosf.

Now, there are a couple of partially-fulfilled statements from acosf that I think are relevant here, in addition to Valkyries and Illyrians continuing to train.

The first is the wish that Nesta made on the friendship bracelets. 

"I wish for us to have the courage to go out into the world when we are ready, but to always be able to find our way back to each other. No matter what." (chp 59)

We know that in the Blood Rite, the second half of that wish was fulfilled. The first half has not been fulfilled yet. That gives us very good reason to assume that the first half will be fulfilled.

All three of them, Nesta, Emerie, and Gwyn, will go out into the world at some point in the future. 

There is another, much larger implication that was made in acosf:

Nesta smirked. “If we are to be Valkyries born again,” she said, “maybe we should combine the Illyrian and Valkyrie techniques.” She’d meant it in jest, but the words rumbled through the space, as if she’d spoken some great truth, something that made fate sit up. Azriel turned to them fully this time, eyes narrowed. Like those shadows had whispered something to him. A chill breathed down Nesta’s spine. Cassian stared into their faces. Like he beheld something he hadn’t seen there before. (chp 44)

And the later on:

Gwyn whispered, “I am the rock against which the surf crashes.” Nesta straightened at the words, as if they were a prayer and a summons. Gwyn lifted the blade. “Nothing can break me.” Cassian’s throat tightened, and even from across the ring, he could see Nesta’s eyes gleaming with pride and pain. Emerie said, “Nothing can break us.” The world seemed to pause at the words. As if it had been following one path and now branched off in another direction. In a hundred years, a thousand, this moment would still be etched in his mind. That he would tell his children, his grandchildren, Right then and there. That was when it all changed. Azriel went wholly still, as if he, too, had felt the shift. As if he, too, were aware that far larger forces peered into that training ring as Gwyn moved. (chp 60)

SJM used similar phrasing in the same book for which we know the consequences: 

Strike after strike, and Cassian could have sworn the world paused as she unleashed herself with the same intensity she brought to training.

This is when Nesta is Making the weapons, which we find out later is actually a significant moment, not just Cassian being hyperbolic about how great his mate is. Then, when Nesta is using the Mask and Harp to heal Feyre, the world also pauses. This phrasing is used when something important is happening - even if we don't know what the implications are, yet.

Given that we know for sure that the Illyrians and the Valkyries are going to continue training, and there are loose threads because we don't know the implications of fate/the world standing up at Nesta's, Emerie's, and Gwyn's statements and/or actions, there is a very, very good chance that the Valkyries will continue being a big part of acotar. 

My final point about the Valkyries is that in myth, they rode horses through the sky - not Pegasuses because those are from Greek myth, and Valkyries are Norse. But they fly through the sky on horses nonetheless. (This is literally the only piece of evidence I have coming from outside the books.) Pegasuses are connected to Avallen and likely the Prison. We know that Helion keeps some, but they are struggling to breed/thrive. (We also know that sjm loves to take what she wants from myth, so it’s not a stretch to think she’d shrug at the Greek/Norse distinction.)

All of this together tells me that the Valkyries have more story coming, and it is connected to the Illyrians'.

Part three: The 8-pointed star

A common thread between both series is the 8-pointed star. There are a few ways in which it is used:

Nesta and Cassian's bargain tattoo in acosf. They both had this tattoo on them - an Illyrian and a Valkyrie. 

Bryce also has the 8-pointed star on her chest that glows when she is near people who will aid her or who are part of the Starborn line. When she took the piece of Theia's light, it went into her star and powered her up.

The Harp was resting on an 8-pointed star in the Prison, where Silene left it.

In HOFAS, Bryce put Truthteller and Gwydion into the slots of an 8-pointed star in order to revive Avallen.

When training, Cassian teaches the Valkyries the 8-pointed star sequence. This is a series of moves that they make with a sword, and is an Illyrian technique. 

Cassian walked her through eight different cuts and blocks. Each was an individual move, he’d explained, and like the punches, they could be combined. (chp 38) “I’d thought today would be a good day to integrate the eight-pointed star, but if you’re already complaining, we can wait until next week.” (chp 44) Nesta lifted the sword and executed a perfect arcing slash. Her weight shifted to her legs just as she flipped the blade, leading with the hilt, and brought up her arm against an invisible blow. Another shift and the sword swept down, a brutal slash that would have sliced an opponent in half. Each slice was perfect. Like that eight-pointed star was stamped on her very heart. (chp 50)

And finally, at the end of HOFAS, Bryce gives Gwydion to Nesta and tells her to explore the 8-pointed star:

“I think that eight-pointed star was tattooed on you for a reason. Take that sword and go figure out why.”

Note that it’s not just a matter of the star, anymore. Both Cassian and Nesta were tattooed with it; Bryce used Gwydion and Truthteller to activate the star in Avallen. And now, Nesta is in possession of Gwydion with knowledge about the Prison and a connection to the star. There are elements coming together, and those elements are connected to both Illyrians AND Valkyries. 

My thinking is that the 8-pointed star is the symbol of the dusk land, the Starborn Princes in Midgard (Theia) and in Prythian, of the first and only High King. If that land is where the Valkyries will be reborn and where Starborn power is from, and we know it is the source of a huge cache of firstlight, then that star is a symbol of what has been lost - and what is about to be revived.

So now the question is - what part will the Valkyries and Illyrians play?

Part four: What might happen to the Prison?

To sum up the above, and adding on a couple of small points that don’t fit elsewhere:

We know that the Illyrians and Valkyries will continue training

We have very heavy-handed phrasing around the world/fate paying attention to the idea of the Valkyries being reborn and working with Illyrians.

We have the connection between Valkyries, Illyrians, and the 8-pointed star because it is also an Illyrian sword technique that is being taught to the Valkyries.

We know that the Prison is going to go through some changes akin to puberty.

In addition, we have Gwyn being allowed to write the Valkyries into the books she is researching. 

SJM has also said that Nesta’s story is going to continue.

Since we know that the Prison is going to change and there are these characters and groups poised for action - I haven’t even touched on Ramiel and the Illyrians being created by the Dagsteri, Azriel and his connection to Truthteller and Enalius, and his reaction to the TT/Gwydion, and will do that in a separate post - we can make some predictions about how that might look. If it’s going to make sense, sjm has to think beyond the magic system that she has… sort-of established, and past the involvement of individual characters. There are a few things to take into consideration with the Prison.

It is very likely that Pegasuses will return to the island as it is suffused with magic and energy again. 

There are also other, unforeseen magical consequences as the magic flows back into it, thanks to the ley lines being “unblocked” by Bryce. 

It may become easier for people/creatures to travel between worlds, given that it is a thin place that has been "unlocked". 

The Prison is still full of prisoners! They are monsters that Silene gathered to hide the Harp, but... does that mean they just get released? Get slaughtered? Do they now have access to the power of the island? What is going to happen with them? 

The High Lords cannot all be trusted to stay within their own courts, minding their own business. Beron is the most obvious example, as he has his eye on Spring while Tamlin is Suffering. 

If there were another court established, one that sits on a huge reserve of firstlight, that could be a huge point of contention amongst the courts. Even if the High Lords don’t want it for themselves, they wouldn’t want anyone else to have it on the chance that one of them would use it against the others. In acomaf, Rhys explains that the Prison is keyed to his blood and that he has jurisdiction of it; however:

“Do all the High Lords have access?” My words were so soft they were devoured by the dark. Even that thrumming power in my veins had vanished, burrowing somewhere in my bones. “No. The Prison is law unto itself; the island may be even an eighth court. But it falls under my jurisdiction, and my blood is keyed to the gates.” (chp 18)

We don’t know yet what that reserve of firstlight is going to mean for the island.

To me, it makes sense for us to have a more neutral third party come in. One who doesn’t have ties to a specific court, but could act in all of their interests. 

Enter: the newly reformed Valkyries. 

I have had a personal headcanon that the Valkyries, once fully established, could create another political/martial entity in Prythian that can help balance the power between all the courts, and provide support when needed. This is how they worked before, which Cassian talks about in acosf: 

“The Valkyries fought when even the bravest males would not. The Illyrians tried to forget that. I fought against males who were my superiors, arguing to help the Valkyries. They beat me senseless, chained me to a supply wagon, and left me there. When I came to, the battle was over, the Valkyries slain.”

Valkyries and Illyrians don’t have the best history, but given that Cassian tried to help them, and that they are working together now, this could be a way of righting a wrong. It could help to explain why fate/the world is taking note. 

The Valkyrie ethos makes sense for this sort of neutral position, too:

“A clan of female warriors from another territory. They were better fighters than the Illyrians, even. The Valkyrie name was just a title, though—they weren’t a race like the Illyrians. They hailed from every type of Fae, usually recruited from birth or early childhood. They had three stages of training: Novice, Blade, and finally Valkyrie. To become one was the highest honor in their land. Their territory is gone now, subsumed into others.”

An improved Valkyrie force, especially if they continue learning Illyrian techniques and recruiting from women across Prythian, could be a big factor in upcoming conflicts with Kochei or any other villain sjm comes up with. They would ensure that the firstlight would be used fairly, so that no court is advantaged or disadvantaged unfairly. It would continue the threads that sjm has left for us, while also giving us space to explore questions that have yet to be answered (such as Azriel’s connection to Truthteller and Enalius). While I think that Nesta would keep her home in the House of Wind, the Prison island would be a good place from which the Valkyries can work - both guarding the monsters that are there, and keeping the firstlight safe.

I believe that Nesta will be the most important character when it comes to reviving the island; while it is heavily implied that the island is already going to have access to its powers thanks to being impacted by Avallen's healing - it is likely already on its way to healing - Nesta with her connection to the 8-pointed star, the Harp, possession of Gwydion, and the Valkyries can help bring stability to the place.