Christy put her hand in the air and spoke. "Dark Spells are use by Dark Witches and Wizards for kill, manipulate or torture. The Dark Spells are known as Unforgivable Curses, like the Imperious Curse, Cruciatus Curse and the Killer Curse Avada Kedavra.' Christy said the last one with some difficulty.'Dark Criatures are those who are considerate as wizard killers, impossible to train or domesticate, poisonous or dangerous. Defense Spells are used by common wizards to protect themselfs. ' She finally finished her "speach".