Bellatrix Lestrange was personally trained by Lord Voldemort, the Dark Lord himself. She was a master of the Dark Arts and an incredibly skilled duellist. Her signature spell was the Cruciatus Curse, which she used with such proficiency that her victims would often pass out or lose their sanity from prolonged exposure. Bellatrix's knowledge of powerful spells was so vast that she confidently boasted to Harry Potter about her superior magical abilities.