Type: Curse
Pronunciation: im-PEER-ee-oh
Description: Places the victim completely under the caster's control. The victim is put into a trance-like state, and becomes very suggestible to the commands of the caster. However, those who are strong willed may learn to resist it. One of the three "Unforgivable Curses," the use of this curse on another human results in capital punishment or life sentence in Azkaban.
Seen/Mentioned: Used on many occasions. First seen in 1994 when Barty Crouch Jr, impersonating ex-Auror Alastor Moody, used it on a spider and later on students during a "class demonstration" in a Defence Against the Dark Arts class. While breaking into Gringotts in 1998, Harry used it on a goblin and a Death Eater when they became suspicious.
Etymology: Latin impero, I command, and English "imperious".
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Viktor Krum under the effects of Barty Crouch Jr's Imperius Curse |