Its natural enemy is the "Space Turtle" or "Maturin", another ancient dweller of King's "Macroverse" who, eons ago, created the known universe and possibly others by vomiting them out as the result of a stomachache.
You've also probably read all of King's horror novels, including The Dark Tower series, which reveals that Pennywise's archenemy is The Turtle.
In Stephen King's IT, readers are introduced to a one-of-a-kind creature that can take any form, the most popular of which is Pennywise the Dancing Clown, and as terrifying as it is, this creature has one major foe: Maturin, the turtle.
Both being interdimensional entities, their powers are at the same level, meaning that the turtle could kill IT if it wanted to. It makes sense that IT is afraid of Maturin – but the viewers and readers also have genuine grounds for cosmic terror.
When does Fortnite Chapter 3 come out and Chapter 2 end? Accordingly, the gang force Pennywise to become small and weak, after which they're able to remove his still-beating heart and crush it in their hands, finally ending his reign of terror.
In the novel, It's origins are nebulous. He took the form of a clown most frequently, Mr. Bob Gray or Pennywise, but his true form is an ancient eldritch entity from another universe who landed in the town that would become Derry by way of an asteroid and first awoke in 1715.
“It” is an evil entity that usually takes the form of a clown named Pennywise (played by Bill Skarsgård) and returns to Derry, Maine every 27 years to terrorize the town. The red balloon is a harbinger that It is watching you.
The spider-clown shrinks as the Losers hurl taunts at It, until it's tiny and weak enough that they pluck out its heart and squash it into nothingness. In the end, they defeat Pennywise by, uh, making him feel really bad about himself.
Young kids fear "pretend" things.
They fear what might be under their bed or in the closet. Many are afraid of the dark and at bedtime. Some are afraid of scary dreams. Young kids may also be afraid of loud noises, like thunder or fireworks.
Soon enough, Pennywise appears, and the fight begins in earnest. As in the 1990 ABC miniseries, which starred Tim Curry as the terrifying clown, Pennywise takes the form of a giant spider for the final battle.
Pennywise's Kills Add Up Over Time
The number is then multiplied by the number of times Pennywise has awakened -- once every 27 years throughout the 270-year history of Derry, equaling ten times -- to come up with a final tally of between 12,000 and 18,000 dead.
That is, when Pennywise morphs into a werewolf, he is subject to the same weaknesses as a werewolf, including silver slugs. In both the original novel and made-for-television adaptation, Pennywise is weakened using silver bullets melted down from earrings.
This incarnation of It/Pennywise is the icon of the Pure Evil Wiki. While every version of It easily qualifies as Pure Evil, it is arguable which version of him is the evilest incarnation of the character.
King decided for IT to predominantly take the shape of Pennywise the Dancing Clown because he believes "clowns scare children more than anything else in the world." IT influences the adults of Derry to passively ignore it and not interfere with his attacks on Derry's children.
In the novel, It claims that its true name is Robert "Bob" Gray, but decided to be named “It”. Throughout the book, It is generally referred to as male due to usually appearing as Pennywise.
Pennywise's origins are briefly explored in both the book and It: Chapter Two, where it's revealed that he is a being that crash-landed on Earth from another dimension hundreds of years ago.
Related: What Does Pennywise Really Look Like In IT? IT arrived on Earth through an event similar to an asteroid impact, landing in what would later become Derry, Maine. Once there, IT adopted its usual pattern of hibernation that lasted between 27 and 30 years, awakening to kill and eat and then going back to sleep.
Another explanation is connected to the Turtle and the cosmic side of IT and Stephen King's Macroverse, suggesting the Losers as the “chosen ones” that were guided and thus protected to an extent by Maturin, the only creature IT is afraid of.
The cinematic adaptation of Stephen King's IT Chapter Two depicted the satisfying death of Pennywise while subtly hearkening back to Pennywise's first 1988 victim, Bill's brother Georgie.
In the 2017 movie, Beverly was abducted by Pennywise and her friends traveled to the sewers to save her. After an odd sexual encounter with all of the boys in the novel following IT's defeat, Beverly and the rest of the Losers' Club agreed to a blood oath, promising to return in 27 years when Pennywise returned.
In both the book and the films, It is an ancient alien creature, older than civilization, and in King's novel, older than our universe. It feasts on the flesh of humans simply because our fears are easy to manifest and they make us taste better.
It's weaknesses are courage and heart. For the sake of spoilers, I won't go too much into the Ritual of Chüd, but suffice it to say that if you want to defeat It, you've got to have the two traits listed above.
The Deadlights are orange writhing lights that exist in Todash Darkness. Pennywise uses its Deadlights to break a person's mind because one look at the Deadlights will make a person go insane due to it not being able to be comprehended by a human mind.