The dead lights are from the Prim, so in some regard they are ‘related’ to the other monsters there. The Crimson King is also from the Prim and both the king and Pennywise have some spider like themes in how they are presented. As does Mordred.

At the end of IT, it’s mentioned that Pennywise had laid some eggs, in the keystone world of Derry. In the DT series, another Deadlight is introduced near the end of the series, Dandelo. Unlike Pennywise, Dandelo uses comedy to disarm and charm.

Based on my King readings, the Deadlights are unique to It. But not just unique to It, but rather that they are actually what It is. As if to say that any image we get of It is just a glamor for the Deadlights. Even the form of It as the ultimate spider. It is all just a glamor of whatever the Deadlights actually are. None of King’s other monsters match both the abilities of the Deadlights nor the god-like status the the Deadlights have in the Macroverse.

Wasn’t there Deadlights in Later?

I’ve not read any novels with the crimson king, but the Stephen King fandom page tells me that he has control over some of the Deadlights, implying that there are multiple. Of course, I myself am not sure.

My understanding of the deadlights is it’s a power that can by used by the crimson king and it to kill or cause insanity. It’s in the dark tower series and insomnia too I believe, probably more.

The Dark Man is killed and eaten by a Spider-Boy.

IT's real existence is out in space. what you see on earth is simply IT's avatar that came on the comet. So the lights your seeing are IT's true form out in space or a beacon to it per say thats why it changes colors.

I’m 100% sure this is a visual aesthetic thing rather than something that has a narrative purpose in universe.

Lots of blockbuster movies have a climax that feature a “big blue beam of light” during the finale.

It’s easier on the eyes and easier to light the actors that way while also keeping a dangerous and tense feel.

Having everything flashing orange for such a long period of time doesn’t feel right.

The movies are pretty loose and fast, different from the source material. But does keep elements (e.g; The Ritual Of Chüd despite it being different, Maturin, Pennywise being a cosmic horror disguised as a clown, etc). But the Deadlights turning blue is quite easy. Because, much like in the novel; the Ritual seems to be the only thing capable of locking IT in a physical form, and keeping it in a corporeal state of being without IT having chance of fleeing or escaping like It did when they were children. 

By locking It into a physical form and keeping the creature in a corporeal state of being, where It can be harmed despite it's physiology as a cosmic entity. It becomes killable as It is stuck on Earth as Pennywise The Dancing Clown (or the Pennywise Spider during the Ritual) until It dies or kills all seven participants. However, the Shokopiwah were not so lucky as they didn't overcome their fears or believe they could kill Pennywise. The Losers could, because they did what the Shokopiwah didn't. Implied to be from how they overcame their fears, traumas, guilt and truly believed they could kill IT. And heavily implied to be assisted and blessed by The Turtle (Maturin).

Essentially, The Ritual is forcefully anchoring It to our world without having any chance to flee back to the Macroverse. (I believe the Turtle was pulling some strings to help the Losers, since originally in the concept art; Maturin was meant to be in the adult Losers' battle against Pennywise). Making it killable and how the hell It lost, despite killing Eddie.

We know It can shapeshift, but in doing so. It is essentially bound by the laws and physics of the shape It inhabits due to Eddie strangling and nearly killing the Leper since he realized that Pennywise is bound by the laws of the shape It inhabits.

As for the Deadlights floating in mid-air? If I'm not mistaken, I think this was IT trying to aim the Deadlights towards and at the Losers Club. 

First, please let us know if this is the movies, the miniseries, or the book, because the answer can change a bit between things.

If it's the book, then read more King, if it's the miniseries, then it's really just IT, and if it's the movies, I only watched them once (on theaters for each, so a while ago), so I don't remember deadlights being mentioned, but probably the same as the miniseries.

IT is a creature from outside of Todash space, which are the spaces in-between the universes that make up the macroverse.

Before I go any further, have you read the Dark Tower? Because a lot of this isn't going to make much sense if you haven't.

I believe IT stays in Derry because it's easy prey. It's off the beaten path, IT can stay low profile and avoid the attention of the fed-boys from the Shop. You don't want Agent Mulder and Scully showing up and ruining your buffet.

It's possible that being from outside the Macroverse, the matter that makes up the Deadlights are alien and mindbreaking to normal humans. The Deadlights are It's true form, they're one and the same. It didn't carry tears in reality with it on it's back, it IS a tear in reality. Perhaps a malevolent thinny, but that's speculation.

What tears?. It didnt come from a universe into our universe, his universe refers to Kings fictional version of our universe, like the Nolanverse.

It already exists in the universe.

There is no reason to think reality has torn, or that dimensional tears have very particular physics.

The reason the deadlights occur in Derry is that King puts EVERYTHING in Derry or Maine or America.

Their true origin is cocaine.

But how did a creature that has a species with canonically ONE deadlight, end up with three of them?

And why wouldn’t Pennywise go back once she realized she was pregnant if the tears are accessible?

And why wasn’t the “power” of the deadlights amplified when used or seen?

Stephen King pillaged Lovecraft (and drops references to Lovecraft's work in his stories). The entities of Lovecraft's cosmology, the Old Gods and the Great Old Ones (who are in constant conflict) are simply alien entities which exist "in the darkness between the stars." The creator of the Universe, for example, is Azathoth, an insane, mindless entity surrounded by orbiting pipers at the centre of the galaxy. In Lovecraft's time, galaxies were called "Universes," and there was confusion about what the Universe was and how large it was, so it's hard to decide what he really meant by this.

If we assume that King is copying Lovecraft's cosmology, the Deadlights are alien entities so vast and powerful and beyond the conception of the human mind that simply looking at them causes insanity. "Outside the Universe" in the sense Lovecraft meant really means "outside the galaxy." The implication is that there may be entities as far beyond the Deadlights as the Deadlights are beyond us which is supported by the literal finger of God appearing at the end of The Stand.

As good a any other theory so if it brings you joy to think this is the fact of the elder God that is It then rock on brother. Headcanon does exist for a reason.

Could be just to let us know that It's not a demon or a singular entity. Despite ITs supernatural abilities, It is inherently biological.

Or maybe to open the door to there being MORE of them. Son of an It lol.

Idk if it's ever been actually established as cannon but it's part of my head cannon that Dandelo was an IT, and that maybe the Crimson King himself shares some common root.

Also, there's a story that is told in Song of Susanna. It's told by the novels version of King while he's under hypnosis by Roland. And it's about being very scared of spiders as a little boy. Believing they were agents of the Crimson King.

Seems like spiders abound in SK world. Bad guys and scary guys are... Spider-y

I’ve just finished the Kingslingers pod cast of IT. It was a good romp, and makes me want to re read the book again….Having read the book 20 years ago I can safely say that “I don’t know what the point of the spiders eggs were”. I hope this helps 😀

It doesn't have to have a point. Though there are other mentions of bigger than normal spiders after IT such as in Tommyknockers.

I also wanna throw The Library Policeman as a probably spawn of Pennywise, and maybe the creature thing that was in Tom Gordon.

Maybe. Could have just been a nasty looking bear. But it fed on Trisha's fear, and repelled by her bravery at the end.

Not much to go on, but fun bit of welding stuff together.

First used in IT. Sometimes makes an appearance in other books, but never meaning the same thing it meant in IT(the book), as that was specific to IT (the creature).

They are mentioned in the gunslinger. If I remember correctly, it was in the town he passed through. Someone alludes to them being near the western coast.

I’m almost sure they’re mentioned in wolves, something related to thunderclap.

It's been a while since I read Dr. Sleep but I want to say there's something akin to them in it.

FWIW, deadlights were a real thing until the electric revolution in the late 19th/early 20th century. They were large crystal prisms meant to help workers in the lower decks of ships have usable daylight. They were also used in sewer construction for the same reason, so plumbers and construction workers would have usable daylight underground. The more common name was deck prism.

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The ritual is not like a magic spell, its just a human conceptualization of the battle of wills it takes to defeat a Todash entity like IT through removing fear from your mind and replacing it with determination and self-assurance.

Honestly, I don't think people should try to tie things in the King universe together too much. The novel It establishes that there is only one entity of the Deadlights, it's not really a species with multiple creatures. Maybe the Deadlights sent multiple vessels to other planets/universes, but it's all part of one entity.

Truth is, King just returns to the same imagery that creeps him out a lot. It becomes apparent when you write that many books. There's a lot of monsters with silver eyes and a lot of shapeshifters, but that doesn't make them all Pennywise.

Also, in this particular case the orange light is imagery pulled straight from Lovecraft's The Colour Out Of Space, which must've made quite an impression on King (it's a great short story). He also uses it as an influence in multiple other books, such as The Tommyknockers. So it's more likely he keeps referencing that story over and over.

>Also, I’m not particularly a fan of the theory that “Pennywise is behind everything” as I’ve heard in some circles

Good. There is entirely too much reaching to connect shit already.

Also , To say that the Wendigo is in Pet Semetary is itself a stretch. Who says so in the book ? No one , really. Jud tells Louis a story , that vaguely references the Wendigo. That's it.

Also , the area behind the barricade is swampy. The orange lights could just be what are called "will o wisps".

My general thoughts on this is that it is a huge stretch based on nothing.

The lights were its eyes IIRC

Yeah I hate it. This makes Pennywise seem like Freddy Krueger. There's absolutely no indication in the book (which should be used as a Bible on how It, the creature operates) that souls get trapped in the deadlights, I always thought that when It kills you and eats you, it eats all of you, including your life force/soul. And that's dark.

But on a better note God damn this is the best CGI in the whole movie. Whoever did the effects on the throat did a fuckin great job. It looks nasty as hell

Yes! Being that IT is referred to as the “eater of worlds”, I always wondered if he was able to create some sort of time travel ability since Young Bev says that she saw them confronting IT again when they were their parents ages. But yes. Good catch.

I never noticed. Now I’m gonna have to rewatch it :)