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"He wheeled his trolley forward cautiously until it was right against the barrier and pushed with all his might. The metal remained solid."
— Harry Potter attempting to access Platform Nine and Three-Quarters[src]

This spell could seal magical barriers and portals of the like commonly used by wizards to limit access to magical locations. In 1992, Dobby used this spell to seal the barrier to Platform Nine and Three-Quarters, preventing Harry Potter and Ronald Weasley from using it, as part of his plot to try to save Harry from the opening of the Chamber of Secrets.

Appearances

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