Unofficial Ultimate Harry Potter Spellbook, The: A complete reference guide to every spell in the wizarding world (Unofficial Harry Potter Reference Library)

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Impedimenta (Impediment Jinx) Type: Jinx Pronunciation: im-ped-ih-MEN-tah Description: Slows down or stops the target. Notes (3): In 1981, Hagrid managed to get to Harry before all the Muggles could look at it; this makes it appear as though the Killing Curse will negate the effect of the Fidelius Charm. Just as the last of her limited oxygen ran out, her head broke the surface of the water and she gasped for air. Lost and shrunken clothing, tainted food and drink, and a complete disregard for any duties to help the young witch were the first phase of their revenge. Impervius (Impervius Charm) Type: Charm Pronunciation: im-PUR-vee-us Description: Makes an object repel water and mist.

Seen/Mentioned: Used by Severus Snape on Gilderoy Lockhart during a live duelling demonstration during the first and last meeting of the Duelling Club in 1992. This is reinforced by Dumbledore stating that Shacklebolt was "remarkably quick on the uptake" in modifying her memory.Taken together, Avenseguim can be interpreted as "to eagerly follow", which aptly characterises the behaviour of a tracking device. In 1943, Horace Slughorn described the spell to a young Tom Riddle as encasing a portion of the torn soul and placing it within an object.

In addition, this fire is made even more dangerous due to the fact that it is extremely difficult to control, and cannot be extinguished with normal or enchanted water.

It may also have been used by Quirrell in 1992, although he is said to have merely "snapped his fingers". Avis (Bird-Conjuring Charm) Type: Conjuration, Charm Pronunciation: AH-viss Description: Conjures a flock of birds from the tip of the wand. Seen/Mentioned: It was suggested by Sirius Black in his letter to Harry for him to use this spell on a dragon. Also used by Harry on the Inferi in Voldemort's Crystal Cave in 1997 and also attempted to use it on Severus Snape in the same year. Age Line) Type: Charm Description: Prevents people above or below a certain age from access to a target.