The Unforgivable Curses were three of the most deadly spells within the Harry Potter universe, and the central protagonist used them on a few occasions. Well connected to the Dark Arts, the trio of spells included the Cruciatus Curse, the Imperius Curse, and the Killing Curse.
Harry and his friends were taught about the existence of the curses at Hogwarts by their Defense Against the Dark Arts Professor, who turned out to be a Death Eater disguised as Alastor Moody. Although the curses were
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