It is Bill who eventually destroys It, engaging It in the Ritual of Chüd in both 1958 and 1985, and eventually killing It's physical form by ripping its heart out.
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 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.
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.
IT's physical form was destroyed and IT's connection to Derry seemingly severed, but the true creature lives on another plane of existence than the Losers Club so it's unlikely that destroying the physical body actually killed IT. Who would win, Nyarlathotep or Pennywise (true form)?
Image via Warner Bros. Finally, Pennywise is beaten into submission. He scurries away, utters the word "fear," and partially disintegrates before falling into the void. It's a powerful defeat of a powerful monster, and it's satisfaction enough were IT to remain a single film.
According to It, when humans got scared, "all the chemicals of fear flooded the body and salted the meat". This is why he prefers to feast on children -- their fears are simple, pure, and powerful compared to the complex, pathological fears of adults. Basically, children are delicious.
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.
The winner is Lucifer Morningstar and maybe quite easily. Lucifer as his name suggests is The Devil of the DC Universe, he is by far one of the most powerful beings to exist. He is the first and most beautiful and the most powerful of all the angels in existence.
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 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.
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 .
As well as having his right arm bitten off, Georgie is trying to crawl away but he was dragged into the sewers and devoured by Pennywise, with an unnamed older woman and her cat being the sole witnesses of the horrific scene, including before Georgie lost his arm.
It is not a true physical entity, thus cannot be killed or harmed by conventional means.
Originally Answered: Why did Pennywise start on Chapter Two with attacking an adult? Pennywise thrives on fear. By killing him, Pennywise gets the town starting to fear others.
The short answer is: yes. At the end of the 1986 novel, the Losers descend back into Derry's sewers and, facing off against It in the form of a giant female spider, challenge it to the Ritual of Chüd (more on that in a second) and ultimately crush Its heart, destroying the creature once and for all.
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).
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. It author Stephen King.
It Is Actually An Ancient Cosmic Force Of Destruction
It is actually an ancient cosmic deity. A god of destruction, not just of our world, but of multiple worlds and even multiple universes.
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.
Muschietti appears to be implying Pennywise was a human familiar who It corrupted and then enjoyed so much It incorporated his shape into its file cabinet of monsters.
And if his victim believes him to be powerless, he will become powerless. And so the group figures out that their best bet is, essentially, to bully the bully: They mock Pennywise, telling him he isn't scary. Humiliated, Pennywise begins to shrink, transforming into an almost Benjamin Button–like, melted clown-baby.
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.