Sealing the Keyhole

Sealing the Keyhole (, Sealing the keyhole) is 's Final Smash in Super Smash Bros. Ultimate.

Overview
Sora shouts "Let's go!" and shoots a beam from his Keyblade. Up to three opponents can be caught in this beam or the keyhole-shaped portal that manifests at its end, which turns into a large, white door with the Smash logo on the front. The door closes and Sora shoots a second beam into a keyhole on the door, then twists his Keyblade as if he is locking the door. Sora then turns around, striking a pose, facing the screen and laughing triumphantly (or saying "", "How's that?" if the language is set to Japanese) as the door explodes behind him.

The Final Smash does roughly 41-50% damage in total. Enemies with over 100% damage at the end of the Final Smash are instantly KO'd; otherwise, they take average knockback.

Origin
The Final Smash references the Keyblade's ability to seal s. Throughout Kingdom Hearts, Keyholes can be found in various worlds, and Sora is required to use his Keyblade to seal each one of them in order to prevent the Heartless from destroying the heart of that world. After the final boss battle, finds and opens the, a doorway that acts as a portal to  and demands he be filled with the darkness he believes is behind it. However, light is behind the door, obliterating Ansem. Darkness starts spilling out soon after, and Sora and friends try to close the door to prevent the darkness from escaping. They achieve this with Sora,, and pushing one end, while  and  pulling on the other. With Sora using his Kingdom Key and Mickey using his, they successfully manage to close and seal the door, but end up separated as a result.

Trivia

 * This is one of two cinematic Final Smashes capable of performing Finish Zoom if under 100% damage, the other being House of Boom. This is likely because of Sora's unique Finish Zoom sequence in Stamina Mode.
 * As a result, if the Final Smash activates Finish Zoom, the Instant KO will not be performed.

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