It can be harmed by psychic punches and name calling during the Ritual of Chud, which is basically a rap battle during a psychic make-out session fueled by the power of friendship. Albeit with less flow. It can be harmed by higher beings than Itself.
In the novel, IT never experienced emotion until IT encountered the Losers Club, in which IT learned fear and hatred first hand, something that was completely new to IT.
Stephen King's 'IT' introduced readers to a one-of-a-kind creature that can take any form, the most common one being Pennywise the Dancing Clown, and as menacing as it is, this creature has one big enemy it's truly scared of: Maturin, the turtle.
Immortality: Its earthly avatar has existed on Earth for thousands if not millions of years. Its true form has existed even longer in the Macroverse (a void outside of time and space that surrounds our own universe).
IT thrives on chaos; an exact 27-year pattern is way too predictable for a being of pure evil. Rather, IT wakes up roughly every three decades, and stays away for a different period of time.
It slept for millions of years, then, when humans appeared in the area, It awoke and began a feeding cycle lasting about a year, feeding on people's fears and frequently assuming the shape of whatever its prey feared the most. After feeding, It would resume hibernation for approximately 30 years before reappearing.
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.
Down in the sewers, during their final encounter, it's much of the same. Mike brings the gun he uses to kill livestock, and the rest of the Losers come prepared with more rods. Beverly deals the final blow by putting one straight down It's throat.
It disguises itself as many frightening things in the movie. Pennywise can morph his mouth into a giant gaping mouth with layers of sharp teeth which he uses it mangle and eat his victims. This is all done with CGI.
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.
Yup! He's a demon and the general idea is if you are not scare, it will only be harder for Pennywise to kill you as he needs to bait you. He can kill you if he wants to anytime and doesn't care. Although, if you are not scared, he will either leave you be for a little while or just kill you in the instant .
Throughout the summer and their trials against Pennywise and the school bullies, the Losers realize that none of the adults in Derry can actually see Pennywise or the horrors he is committing against the children of Derry.
Stephen King's IT introduced readers to a one-of-a-kind creature that can take any form, the most common one being Pennywise the Dancing Clown, and as menacing as it is, this creature has one big enemy it's truly scared of: Maturin, the turtle.
Georgie's Arm ('It')
After a creepy conversation with Pennywise, the killer clown chomps on Georgie's arm, leaving the boy to drag himself to safety as blood pours into the raindrops on the street before he's pulled into the drain by Pennywise, never to be seen again.
Superhuman Strength: It can tear the heads and limbs of human bodies with extreme ease, either with arms or mouth (as Pennywise or any humanoid form). Superhuman Speed: Bill notes that It can move at extreme speeds, claiming that it was way faster than an "express train".
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.
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.
Appearing like a comet or asteroid, It landed on Earth at what is initially a nondescript time long ago. Later on in the film, when the Losers enter It's Lair, they realize they're standing in the ground zero crater of an asteroid right beneath Derry. The novel makes it clearer.
The only reason Pennywise eats the physical bodies or parts of them is because that is what humans expect monsters to do. IT is bound by the rules of the shape it inhabits.
What symbolizes a child's sense of imagination is manipulated to lure children to the clown, Pennywise (Bill Skarsgård). Pennywise's most notable ability is to manifest as each of the children's fears. Whenever the red balloon appears, it signals that Pennywise is close, if not already present.
Kersh is Pennywise's daughter.
It comes in many shapes and sizes. Most iconically, It takes the form of Pennywise the Clown, whose real name is actually Bob Gray (anticlimactic, honestly).
As there's no absolute time frame when it comes to IT's hibernation, the IT miniseries chose to let it sleep for 30 years, and the film went with 27, just like the novel.
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.