Deadlights

Deadlights are writhing radiant orange lights that are a mystifying but very deadly and terrifying eldritch form of energy originated from the preternatural dimension known as the Macroverse (also known as the "Todash Darkness") and a recurring plot element from the works of legendary horror writer Stephen King including The Dark Tower and Stephen King's IT. It is well known one mere glance (no matter a living soul stares briefly or longer) into these bright lights can instantly cause death and permanent insanity.

The Crimson King: The dreaded dark lord, the Crimson King himself, wields the Deadlights, which is also referred to as a type of magic. The Deadlights, when used, are able to cause great suffering to the point of death, and even possibly do things to the effected victim's soul. The Crimson King uses the Deadlights around the once cursed American town of Derry within Maine, in the book "Insomnia" to ascend to another level of the Dark Tower, but yet never directly casts "deadlights" as any sort of sorcery himself. Here, the Deadlights are shown to inhabit the higher level of the Tower to which the Crimson King ascends, implied to be one of the "Higher Random" levels where Life and Death as commonly understood do not exist.

It/Pennywise the Dancing Clown: The very life essence and even true form of the twisted extra-dimensional fiend IT (who was part of an obscure race of shapeshifting monsters called by its Gaelic name "Glamours") is comprised of the Deadlights themselves and "he" (usually in his favorite deceitful form as Pennywise the Clown) uses this power to blind his fresh victims (usually human children) and robs them of their conscious minds as It drives them crazy as well as leave them both immobile and lifeless before It takes them away and consumes them. It's true form along with the Deadlights can be revealed via the Ritual of Chüd as performed by the group of 7 mortal misfit children twice in both their childhood and later in their adulthood.

In the 1990s TV miniseries Stephen King's IT, the murderous local bully Henry Bowers witnessed It's Deadlights in 1960 after his recent failed attempt to kill Stan Uris of the Lucky Seven/Losers' Club and survived, but ended up being insane while his hair turned pale white as a side effect of the Deadlights' power, before he emerged from the sewers beneath Derry and immediately arrested by the police for the deaths of the children taken by It which he confessed of while in custody.

In the 2017 live-action movie adaption of the famous Stephen King novel (referred to as It: Chapter One), Beverly "Bev" Marsh of the Losers Club witnesses the Deadlights in It's mouth and is put into a temporary coma. She is brought out of the coma by Ben Hanscom kissing her. Upon looking at the Deadlights, Beverly hears multiple sounds of children screaming. Including an older person shouting "HELP ME!!!" This implies that the Deadlights and to an extension It, did not just eat their flesh and fear, but consume their souls as well.

In the 2019 live-action movie sequel (referred to as It: Chapter Two), 27 years later, the Losers Club except the now late Stan Uris came to the crater forged by It's arrival on Earth millions of years ago beneath the sewers of Derry and performed the Ritual of Chüd and succeeded where the 7 slain members of Derry's original local native American tribe known as the Shokopiwah have failed while extinguishing the blinding Deadlights by killing the heart of the vile cosmic fiend in it's weakened blob-like fetal state at the end of the childhood friends' long grueling fight once and for all.