The final battle under Derry (1958)

The final battle under Derry in 1958 is the climactic confrontation between the seven children of the Losers' Club and the ancient, shape-shifting entity known as It. This event, which takes place in a vast, cyclopean chamber deep beneath the city, represents the culmination of a summer-long struggle against a predator that has haunted Derry for centuries. The battle is not merely a physical fight but a psychic ordeal that tests the children's courage, belief, and unity to their absolute limits, ultimately costing one of them his life and leaving scars that will fade only with the deliberate erasure of memory itself.

Descent into the Lair

The confrontation is precipitated not by a planned assault but by a desperate flight. On August 14th, 1958, Henry Bowers, armed with a switchblade and driven by the entity's influence, chases Beverly Marsh through the Barrens. The Losers' Club, now seven strong with the inclusion of Mike Hanlon, is forced to flee into a disused pumping station to escape Bowers and his friends, Victor Criss and Belch Huggins. Led by Bill Denbrough, they crawl into the dark, narrow inflow pipe, forming a single-file line with each child keeping a hand on the shoulder of the one ahead. Eddie Kaspbrak, despite his broken arm and asthma, guides them through the labyrinthine tunnels with an uncanny sense of direction, navigating by the sound of running water and the smell of decay. The tunnels grow larger and older, transitioning from modern sewer pipes to ancient, crumbly clay conduits that seem to descend far below the city's foundations. The air becomes thick with a yellow, ancient stench, and the children feel a growing sense of wrongness and disorientation as they approach the entity's domain. They pass the skeletal remains of a Water Department worker and, later, the bodies of Patrick Hockstetter, Victor Criss, and Belch Huggins, who have been killed by the entity or its agents in the darkness. The tunnel eventually opens into a vast, cathedral-like chamber with a ceiling lost in shadow, lit by a sickly green-yellow phosphorescence that seems to emanate from the walls themselves. At the far end of this chamber stands a small, child-sized door made of oak bound with iron, marked with a symbol that each child sees differently—a paper boat, a bird, a fist, a leper's face. Heaped at its foot are the bones of countless children, the entity's victims over the centuries. Bill pushes the door open, and they enter the lair of It.

The Spider and the Ritual of Chüd

Inside the lair, the children are confronted by the entity's final, tangible form: a gigantic, black Spider, fifteen feet high, with ruby-red eyes, jagged mandibles, and a grotesquely swollen belly. This form is a compromise, the closest their minds can come to grasping the entity's true, unimaginable nature, which exists as a formless, destroying light—the Deadlights. The Spider is female and pregnant, its egg-sac dragging on the floor. It attacks immediately, its legs and stinger lashing out. Bill Denbrough, driven by his grief for his brother George and his rage at the entity, steps forward to meet it. He initiates the Ritual of Chüd, a psychic battle he had read about in a library book, where the combatants lock minds by biting each other's tongues and then tell jokes and riddles, the first to laugh losing their soul. Bill's mind is hurled into a void, the macroverse, where he encounters the dead husk of the Turtle, a cosmic entity that had once created the universe. The Spider tries to fling Bill into the Deadlights, but he resists by reciting the tongue-twister his mother taught him: "He thrusts his fists against the posts and still insists he sees the ghosts." This act of defiant belief allows him to bite into the entity's psychic tongue and begin to pull himself back. Richie Tozier, seeing Bill falter, rushes forward and also seizes the entity's tongue, using his own Voices to distract and wound it. The two boys are hurled through the void together, and Richie manages to grab Bill's hand just as he is about to be pulled into the Deadlights. They are dragged back toward their bodies, but the entity fights them, and Richie begins to lose his grip.

Eddie's Sacrifice and the Killing Blow

As Bill and Richie struggle to return, Eddie Kaspbrak, watching from the lair, sees the Spider preparing to impale Bill with its stinger. With his broken arm and his aspirator in his good hand, Eddie charges the monster. He triggers the aspirator into one of the Spider's ruby eyes, and the mist of the placebo medicine, infused with his own desperate belief, burns into the eye like acid, causing it to run in a stream of ichor. Eddie then shoves his good arm into the Spider's mouth and triggers the aspirator again, shooting the mist down its throat. The Spider's jaws snap shut, ripping Eddie's arm off at the shoulder. Eddie falls to the floor, bleeding profusely. As he dies, he whispers to Richie, "Don't call me Eds," and then is gone. His sacrifice, however, gives Bill and Richie the moment they need. They slam back into their bodies, and Bill, with a final, desperate charge, plunges his fist into the Spider's body. He feels its heart, a great, pulsing organ, and crushes it between his hands. The Spider shrieks and collapses, its body twitching and steaming as it dies. The light in the chamber begins to fade, and the web holding Audra Denbrough, Bill's wife, who had been captured by the entity, begins to decay. Bill finds Richie, who has been knocked unconscious, and carries him out of the lair. Ben Hanscom, meanwhile, methodically stamps out the Spider's eggs, crushing each one to prevent the entity's spawn from surviving.

Aftermath and the Fading of Memory

The surviving children—Bill, Beverly, Ben, Richie, and Mike—stagger out of the tunnels, emerging through a crack in the street caused by the catastrophic storm that has ravaged Derry. They are covered in filth and blood, but they are alive. Eddie's body is left behind in the lair, a decision that haunts them. Audra is catatonic, her mind shattered by her exposure to the Deadlights. The children make a blood oath in the Barrens, swearing to return if the entity ever awakens again. As they grow up and leave Derry, the memory of the summer of 1958 begins to fade, a deliberate psychic erasure that allows them to live normal lives. The cycle of violence in Derry is broken, but the cost is immense: the loss of a friend, the trauma of the confrontation, and the slow, inexorable forgetting of the most important event of their childhoods. The final battle under Derry is not a triumphant victory but a desperate, costly survival, a testament to the power of childhood belief and friendship in the face of an ancient, incomprehensible evil.