fandom.com/wiki/Farewell">TV ending and the original graphic novels ? Locke & Key S3E8: "Farewell" Spoiler Recap

The Lockes realize that the portal shrinks whenever a key is thrown into it.

Tyler and Kinsey use the newly introduced Creation Key —a magical drawing tool that brings sketches to life—to fend off Captain Gideon during a high-stakes chase.

In a pivotal family discussion, they decide to give up magic forever to permanently seal the doorway to the demon world. One by one, they toss their remaining keys into the portal until it is completely closed. Emotional Resolution

At Keyhouse, Kinsey stabs Gideon with the Alpha Key , a weapon specifically designed to kill demons. Gideon is then pushed into the demonic portal in the Great Room. A Difficult Decision

The series finale of Locke & Key , titled (Season 3, Episode 8), brings the Locke family's magical journey to a definitive close. The Final Battle and Gideon’s Defeat

The very last scene features a subtle "whispering" sound—the signature noise of the keys—suggesting that while the portal is closed, magic may never truly be gone.

The episode begins with Kinsey, Tyler, and Ellie narrowly escaping Gordie Shaw's collapsing mind.