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"At once, the statue's hump opened wide enough to admit a fairly thin person."

—Description^[src]

Dissendium was a charm that revealed hidden passageways.

Known practitioners

There are various theories put forth in regards to the etymology of Dissendium.

While initially this appears to be a simple password for the statue, it was used in other media in attempts to open lockets, out of frustration.

↑ Hermione retrieved Harry's cloak from beneath the One-Eyed Witch; she needed to have cast Dissendium to open the passage