This spell is used to create a bubble of air around the caster's head. It is mostly used to allow the caster to breathe underwater for an extended period of time. Cedric Diggory and Fleur Delacour used this Charm in the second task of the Triwizard Tournament.
Students also began to use the charm for fresh air after Fred and George Weasley left the school and multiple amounts of Stink Pellets and Dungbombs were used in the corridors by students. Incantation unknown.
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