In Harry Potter and the Order of Phoenix, Dolores Umbridge uses a Blood Quill to make Harry write lines with the phrase "I must not tell lies" over and over again, causing his hand to bleed. She also threatens to use the Cruciatus Curse on Harry to get information from him. However, she is not successful in casting the curse as Hermione Granger takes them to the Forbidden Forest under the pretense of finding a secret weapon. The Black Quill, also known as the Blood Quill, is a Dark magical object used as a torture device that writes with the blood of the person using it.