In several places we encounter references to a hypothetical Plane of Darkness. For example in Chapter 181 – Revenant – Azalea Ellis we find out that the Crown’s prison was based on the idea that she’s connected to the Plane of Darkness, and therefore a trap involving Radiance should keep her in prison. Obviously it didn’t. The other chapters with references are Chapter 3 – A Business Contract – Azalea Ellis, Chapter 90 – On the Nature of Shadows – Azalea Ellis, and particularly Chapter 123 – An Honorable Burial – Azalea Ellis. I say particularly in the last time, because that’s how Siobhan chooses to curse her father:
“May you receive exactly what you deserve, Ennis No-Name,” she growled, her voice hoarse. “Once of my blood, but no more. I commend your blood and body to the earth, and your soul to the Plane of Darkness.”
This fits perfectly with the idea that things from the Plane of Darkness are devils.
Going back to the Crown, they thought she might be involved because of the shadow familiar that she creates with:
Life’s breath, shadow mine. In darkness we were born. In darkness do we feast. Devour, and arise.
The thing sealed in her mind has connections to her shadow. Let’s assume that it is connected with the Plane of Darkness. It also has strong connections to nightmares, insanity, and devouring. But devouring…what? Chapter 181 – Revenant – Azalea Ellis describes what it does to a victim:
The man choked on it but managed to calm his breathing. He spoke again with a weak, breathy voice. “The darkness was watching, knowing. But the creature … It was hungry. So empty, so cold, like it had never known the warmth of the sun or the touch of a mother. And it got inside me. I can’t feel it. It’s just…gone. But I fear that it took something from me. Except, except—” He let out a wet, ragged cough. “What did it take? What did it eat? What am I missing ?”
Let’s go back to the devil idea. What do devils traditionally want? Souls! Which, we’re told a couple of times, modern magic has found no evidence of. For example in Chapter 192 – Nine Full Breaths – Azalea Ellis we get confirmation from Thaddeus that souls are in the realm of speculation. And so if the soul was taken, it is no surprise that the healers are unable to figure out what is wrong!
Now let’s look at Siobhan’s nightmares. As described in Chapter 139 – Sword of Damocles – Azalea Ellis she sees them through a mirror. It is a world of earth tones and fog. Including a face of smoldering brimstone that she struggles not to remember. I believe that the eyes of that face are the amber eyes of her shadow in Chapter 201 – A Sealed Memory – Azalea Ellis. A face of smoldering brimstone? That sure as heck sounds to me like a devil! From a land whose colors sound like a spooky graveyard.
Now let’s bring in a comment from Chapter 161 – Myrddin’s Reflection – Azalea Ellis that seems relevant:
Sebastien had always had a somewhat instinctive distrust of mirrors. Like other children feared what their toys did in the dark with no one around to watch them move, Siobhan had feared what happened in the mirror world when she was not looking.
What mirror world? Have you ever seen a one-way mirror? It’s just a piece of glass with a thin sheet of metal in it. The only purpose of the glass is to hold the mirror. Now if one side is bright, and the other is dark, it simply looks like a mirror from the bright side. Well, what happens if we change every mirror to a one-way mirror, with the Plane of Darkness on the other side? Everything looks like it does now, except that the Plane of Darkness becomes the mirror world!
Was young Siobhan’s distrust due to a childish superstition? Or due to growing up in a family with connections of some kind to the Plane of Darkness? Is it coincidence that the behavior of Myrrdin’s reflection in the story echoes the behavior of what’s sealed in Siobhan’s memory? Which is a thing that she first saw through what seems like a portal to another place…showing a bizarre and scary mirror world?
Am I done? Not yet!
Siobhan is astonished that the sealed memory could have drained the beast core that she swallowed. Devoured its energy, as it were. This brings to mind Chapter 188 – The Curse of Curiosity – Azalea Ellis where we find out about the process for producing celerium:
Kiernan gave her a strange look. “You can speak freely with me, my lady. I already know that it holds the process for purifying and draining beast cores of power without shattering them, allowing us to turn them into pure celerium that can be used as Conduits.”
And now we have a way to drain beast cores, maybe without shattering them. Namely invite a shadow from the Plane of Darkness to arise and devour them. But this has the unwelcome effect that you now have a devil with a good deal of power. So maybe you don’t want to do this around people?
Where did Myrddin do it? Well, Prologue – Myrddin’s Hermitage – Azalea Ellis has what might be a hint:
Atop it was a book. It lay open, with the handwriting stopping halfway down the page, abruptly, as if it had been interrupted. It was surrounded by loose sheets of parchment that held the faint remnants of drawings and diagrams, faded to the point of illegibility. Two bowls sat across from the book, one filled with beast cores of all different colors and sizes, enough potential energy for even the most powerful spells, and one with what seemed to be pure celerium Conduits, each half the size of his fist.
Apparently Myrddin did it in his hermitage. In the Black Wastes. A place filled with dangerous things that drives people insane. Which Chapter 144 – Alliance Against Curiosity (Book 4 Start) – Azalea Ellis suggests is due to dangerous magic injected by the Brillig. Am I going out on a limb in guessing that Myrddin went to a place already infected with the Plane of Darkness to conduct an operation which can create magical waste that can infect the neighborhood with a connection to the Plane of Darkness?
Now does this connect to having a split will? The series documents that the brillig, Myrddin, and Siobhan all can split wills. All have some sort of connection to the Plane of Darkness. Chapter 160 – Decryption Clues – Azalea Ellis suggests that the ability to split wills involves some sort of extensive self-mutilation. The same idea shows up in the next chapter, both in Lacer continuing to talk about it, and in Siobhan recalling that detail from the previous chapter. Could what’s sealed in her mind be connected to that capability?
That’s it for my speculation. The Plane of Darkness is realm of devils and lost souls. It is also the mirror world. It is connected to both what’s in her mind, and the Black Wastes. The thing in her mind has been taking souls, and wants out so that it can take more. It may be a devil. Having a connection allows you to split your mind. You can also use it to make celerium from beast cores, at significant cost to the environment.
Oh fine, I’ll add one more piece of speculation. If Waverley ever finds out that she can contact an elemental from the Plane of Darkness through Sebastian, she’ll want it for the coolest familiar ever. This would be…a spectacularly bad idea.