Alright.
First off, let's start with the fact that his mother, the Crimson Queen, originates from the Prim. Aside from the whole thing about numerous Prim creatures being nowhere near
Low 2-C (let's not get into that again until later), the main issue with using this as a justification is that the Prim itself isn't anything but a sea of creation.
No, I'm serious. All of the references to it being a "great primordial sea of chaos/magic/etc." are literal. In fact, the people of Arthur Eld's kingdom even managed to build dams to keep the waters of the Prim at bay once they had started to recede:
Gan causing the Prim to recede comes from the fact that he turned it into the physical universe. That's what the whole thing about how "From the magical waters dripping out of his navel, Gan spun the physical universe." means when put in conjunction with the numerous other quotes about how the Prim's creatures became "stranded" on the new worlds of creation.
These creatures don't predate Gan, by the way. Gan was the first to be born from the Prim, and literally everything else besides the Prim came after him:
The notion of the Prim being made up of literal waters of magic makes this scene of Maerlyn "catching the drops in his hands" and "racing back to his cave on the shores of the Prim" in
The Laughing Mirror Part I seem a whole lot more logical and less akin to flowery, metaphorical nonsense:
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So basically, there's nothing special about "originating from the Prim". Literally everything originated from the Prim as per Gan's will, and the Prim itself was merely a sea of magic which Gan made the multiverse out of. A literal one that normal humans (Not the Old Ones, either) were able to hold back with man-made dams.
Moving onto the Prim's creatures and the Crimson Queen, the
Maerlyn's Rainbow short story goes on to give us this scene:
Not only are Maerlyn's troupe of Prim-borns very much physical and three-dimensional, but Sir Kay Deschain was able to mortally wound the Crimson Queen with his sword. Now before anyone starts to say anything about PIS or whatever, bear in mind that this is the only physical showing that the Queen has throughout the entire breadth of the series' continuity. At all.
Going by Roland and company, I assume Sir Kay to be
at least Wall level, but I'll leave that one up for discussion.
Here's where we get to the Crimson King himself. If the above doesn't mean anything to anyone, then maybe this will:
The Crimson King (referred to as "the Red Prince" here) is only
half Prim creature.
Guess who else fits that description?
Proceeding to the material that actually comes from the novels, here's the bit I mentioned earlier about him riding one of his gray horses (nicknamed Nis) to the Tower:
This is spelled out for us as bluntly as it can be. He used a common spoon that he had sharpened to a point in order to "kill" himself, then mounted a horse and began making his way to the Tower.
The "gray horses" themselves aren't anything special either, by the way. That term is referring to the mechanical horses that the Warriors of the Scarlet Eye had commandeered alongside numerous other forms of Old Ones technology. In addition to their direct appearance in
Wolves of the Calla, you can see them here:
As for whether or not Los' should be
Low 2-C, well, there's really no evidence that he's on that level. In fact, the prior similarities that he shares with Pennywise are only similarities to the avatar of that being, not the true being itself. The appearance of the "deadlights" was only his method of traveling to one of the higher levels.
Which, for the record, happened after Ralph stabbed him in the eye with Lois' earring, then blasted him in the mouth with a "booby trap" of energy that Clotho and Lachesis had planted into his arm:
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As an aside, just like with every other work, the true Crimson King never appears. Ever. The only Crimson King we see in
Insomnia is the one shown in the above pages. I'll let you decide how to interpret that.
Basically, Los' is most certainly not
Low 2-C or any form of Tier 2, nor is he
Immeasurable speed in even the most basic sense of the phrase. What ratings should he have, then?
If you ask me, he's not any slower than
Randall Flagg speed-wise, just on general principle. You
could say he is due to lack of evidence to the contrary, but I find that to be illogical in-context.
As for his AP, well:
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This can be calc'd. We know that the robotic horses of the Old Ones aren't any slower than normal horses running at top-speed, and the act of causing a violent storm to follow you around and sustain itself as you travel (because yes, these pages indicate that the storm was following him as he traveled by Odd's Lane) should net some decent results as far as a storm calc goes.
Whatever results from that can be his AP with his powers. Physically, I would put him at at least
Wall level as I mentioned above, for the fact that he should absolutely not be any weaker physically than Roland, Sir Kay, Flagg or any other number of the DT characters who occupy that tier. But again, everyone else is open to discuss that further if they feel like it.
Also, I'll be getting to Dis later. I still have something of a bone to pick with him.