But Gan was not the only demiurge to arise from that primordial magical soup. And just as night inevitably follows day, and as the ki'box must sit below the heart and the head, so that which came after the bright light of Gan dragged like a heavy shadow. What bubbled up from the depths of the Prim with a great burping stench of decay was the force of the Outer Dark, the ki'box of eternity.
- The Gunslinger Bor
The Crimson King is explicitly the shadow to Gan's light. He's a being of similar standing, arising from the same magic of the Prim that Gan emerged.
The Crimson King's goal is literally to destroy the whole Dark Tower, but he can't because he is locked away. This cannot be anything but High 1-B.
"You asked how many worlds," Parkus begins. "The answer, in the High Speech, is da fan: worlds beyond telling." With one of the blackened sticks he draws a figure eight on its side, which Jack recognizes as the Greek symbol for infinity.
"There is a Tower that binds them in place. Think of it as an axle upon which many wheels spin, if you like. And there is an entity that would bring this Tower down. Ram Abbalah."
At these words, the flames of the fire seem to momentarily darken and turn red. Jack wishes he could believe that this is only a trick of his overstrained mind, but cannot. "The Crimson King," he says.
"Yes. His physical being is pent in a cell at the top of the Tower, but he has another manifestation, every bit as real, and this lives in Can-tah Abbalah - the Court of the Crimson King."
"Two places at once." Given his journeying between the world of America and the world of the Territories, Jack has little trouble swallowing this concept.
"Yes."
"If he - or it - destroys the Tower, won't that defeat his purpose? Won't he destroy his physical being in the process?"
"Just the opposite: he'll set it free to wander what will then be chaos . . . din-tah . . . the furnace. Some parts of Mid-World have fallen into that furnace already."
- Black House
The Crimson King's true form is locked away, which is why he doesn't just instantly destroy the Tower. If his manifestation succeeds on its goal, the true Crimson King won't die as a result of all of existence collapsing.
Again At least High 1-B, unarguable.
Clotho: [Be content with this: beyond the Short-Time levels of existence and the Long-Time levels on which Lachesis, Atropos, and I exist, there are yet other levels. These are inhabited by creatures we could call All-Timers, beings which are either eternal or so close to it as to make no difference.
Short-Timers and Long-Timers live in overlapping spheres of existence-on connected floors of the same building, if you like-ruled by the Random and the Purpose. Above these floors, inaccessible to us but very much a part of the same tower Of existence, live other beings.
Some of them are marvelous and wonderful,-others are hideous beyond our ability to comprehend, let alone yours. These beings might be called the Higher Purpose and the Higher Random... or perhaps there is no Random beyond a certain level,we suspect that may be the case, but we have no real way of telling.
We do know that it is something from one of these higher levels that has interested itself in Ed, and that something else from up there made a countermove. That countermove is you, Ralph and Lois.]
- Insomnia
["Last summer, after he beat his wife up, Ed spoke to me of a being he called the Crimson King. Does that mean anything to you fellows?"] Clotho and Lachesis exchanged another look, one which Ralph at first mistook for solemnity.
Clotho: [Ralph, you must remember that Ed is insane, existing in a delusional state-" ["Yeah, tell me about it."] "but we believe that his "Crimson King" does exist in one form or another, and that when Atropos cut his life-cord, Ed Deepneau falls directly under this being's influence.] The two little bald doctors looked at each other again, and this time Ralph saw the shared expression for what it really was: not solemnity but terror.
- Insomnia
The Crimson King is one of the beings who come from outside and beyond all the infinite higher and lower levels of existence contained by the Dark Tower, just like Gan and Bessa.
The Red King's influence is limited by the Tower, but he has built The Big Combination/The King's Forge to help "boost" his influence:
"That thing you hear, that's the Crimson King's power plant," Burny says. He speaks with pride, but there is more than a tinge of fear beneath it. "The Big Combination."
- Black House
And in the distance - dim and baleful, its source somewhere over the horizon - a dark crimson light waxed and waned. Heart of the rose, she thought, and then: No, not that. Forge of the King. She looked at the pulsing sullen light with helpless, horrified fascination. Flex...and loosen. Wax...and wane. An infection announcing itself to the sky.
"Come to me now, if you'd come at all, Susannah of New York," said Mia. She was dressed in a heavy serape and what looked like leather pants that stopped just below the knee. Her shins were scabbed and scratched. She wore thick-soled huaraches on her feet. "For the King can fascinate, even at a distance. We're on the Discordia side of the Castle. Would you like to end your life on the needles at the foot of this wall? If he fascinates you and tells you to jump, you'll do just that. Your bossy gunslinger-men aren't here to help you now, are they? Nay, nay. You're on your own, so y'are."
Susannah tried to pull her gaze from that steadily pulsing glow and at first couldn't do it. Panic bloomed in her mind
(if he fascinates you and tells you to jump)
and she seized it as a tool, compressing it to an edge with which to cut through her frightened immobility. For a moment nothing happened, and then she threw herself backward so violently in the shabby little cart that she had to clutch the edge in order to keep herself from tumbling to the cobbles. The wind gusted again, blowing stone-dust and grit against her face and into her hair, seeming to mock her.
But that pull...fascination...glammer...whatever it had been, it was gone.
- Song of Susannah
Jack points at the ugly complication of struts and belts and girders and smoking chimneys. He points at the straining ants. The Big Combination disappears up into the clouds and down into the dead ground. How far in either direction? A mile? Two? Are there children above the clouds, shivering in oxygen masks as they trudge the treadmills and yank the levers and turn the cranks? Children below who bake in the heat of underground fires?
- Black House
This is what happens when it is destroyed:
In world upon world - in worlds strung side by side in multiple dimensions throughout infinity - evils shrivel and disperse: despots choke to death on chicken bones; tyrants fall before assassins' bullets, before the poisoned sweetmeats arrayed by their treacherous mistresses; hooded torturers collapse dying on bloody stone floors. Ty's deed reverberates through the great, numberless string of universes, revenging evil as it spreads. Three worlds over from ours and in the great city there known as Londinorium, Turner Topham, for two decades a respected member of Parliament and for three a sadistic pedophile, bursts abruptly into flame as he strides along the crowded avenue known as Pick-a-Derry. Two worlds down, a nice-looking young welder named Freddy Garver from the Isle of Irse, another, less seasoned member of Topham's clan, turns his torch upon his own left hand and incinerates every particle of flesh off his bones.
Up, up in his high, faraway confinement, the Crimson King feels a deep pain in his gut and drops into a chair, grimacing. Something, he knows, something fundamental, has changed in his dreary fiefdom.
- Black House
A ripple of evil occurs across every world in every universe and dimension of the Dark Tower, reaching up to the highest floor where the true Crimson King is trapped, and he feels it too.
This is, again, unarguably High 1-B.
"Ka is drawing you to the Devar-toi, but a very powerful anti-ka, set in motion by the one you call the Crimson King, is working against you and your tet in a thousand ways."
- The Dark Tower
The Crimson King has his own force that acts as the antithesis to Ka, the fate set and decreed by Gan. This means that the Crimson King can actively defy and ignore Gan's will to an extent.
Again, High 1-B.
"I'm Gan or possessed by Gan, I dont know which, maybe theres no difference." King began to cry. His tears were silent and horrible. "But its not Dis, I turned aside from Dis, I repudiate Dis, and that should be enough but its not, ka is never satisfied, greedy old ka...."
- Song of Susannah
"I'll be a vampire, a slave to him. His scribe, maybe. His pet writer."
"Whose?"
"The Lord of the Spiders. The Crimson King. Tower-pent."
- Song of Susannah
The Red King can grant authors the ability to alter reality. This gives credence that he is an entity like Gan, who is responsible for all stories.
Speaking of that,
Insomnia is absolutely, 100% legitimate. To say it's not because of Stephen King's purpose goes completely against the logic of the Dark Tower, which states that
all fictional stories of all writers are reflections of some level of the Dark Tower.
"Would you risk destroying that world as well as this, and the other worlds sai King has touched with his imagination, and drawn from? For it was not he that created them, you know. To peek in Gans navel does not make one Gan, although many creative people seem to think so. Would you risk it all?"
- The Dark Tower
"No writer is Gan - no painter, no sculptor, no maker of music. We are kas-ka Gan.......The prophets of Gan."
- The Dark Tower
It was a photocopy of a poem by Robert Browning. King had written the poet's name in his half-script, half-printing above the title. Susannah had read some of Browning's dramatic monologues in college, but she wasn't familiar with this poem. She was, however, extremely familiar with its subject; the title of the poem was "Childe Roland to the Dark Tower Came." It was narrative in structure, the rhyme-scheme balladic (a-b-b-a-a-b), and thirty-four stanzas long. Each stanza was headed with a Roman numeral. Someone-King, presumably-had circled stanzas I, II, XIII, XIV, and XVI.
"Read the marked ones," he said hoarsely, "because I can only make out a word here and there, and I would know what they say, would know it very well."
"Stanza the First," she said, then had to clear her throat. It was dry. Outside the wind howled and the naked overhead bulb flickered in its flyspecked fixture.
"My first thought was, he lied in every word,
That hoary cripple, with malicious eye Askance to watch the working of his lie On mine, and mouth scarce able to afford Suppression of the glee, that pursed and scored Its edge, at one more victim gained thereby."
"Collins," Roland said. "Whoever wrote that spoke of Collins as sure as King ever spoke of our ka-tet in his stories!"
- The Dark Tower
"This is the inner keep," she said. "Beyond it is the village of Fedic, now deserted, all dead of the Red Death a thousand years ago and more. Beyond that - "
"The Red Death?" Susannah asked, startled (also frightened in spite of herself). "Poe's Red Death? Like in the story?" And why not? Hadn't they already wandered into - and then back out of - L. Frank Baum's Oz? What came next? The White Rabbit and the Red Queen?
- Song of Susannah
This applies even to all stories written by Stephen King, as he inserts himself in the Dark Tower books and outright shows that his stories are inspired by Gan and are all true in the Dark Tower.
So it doesn't matter why Stephen King wrote Insomnia, it is, by definition, 100% true and acceptable.
As are the comicbooks. To try and divide "Canon' into The Dark Tower goes completely against the philosophy of the book series.
In fact, it goes against the overall idea of the story to separate it from the rest of fiction, but by necessity we do that or else it'd be impossible to Tier Gan, The Crimson King, and Bessa.
Also, yes, as Aeyu said, the idea that the Old Ones, three-dimensional beings with Infinite-Dimensional Technology, are infinite levels of infinity above
the ******* shadow counterpart to Gan Himself, who predates the Dark Tower and heralds from the realm beyond it, is inane.